JP5380845B2 - Motor drive control device, hybrid system, and drive control method for motor drive control device - Google Patents

Description

  The present invention relates to a motor drive control device, a hybrid system, and a drive control method for the motor drive control device, and can be applied to, for example, a heavy machine used as a construction machine.

  According to the hybrid system employed in the heavy machinery, not only the hydraulic pump can be driven by the engine, but also the hydraulic pump can be driven using a generator and an electric motor.

  Specifically, the generator converts mechanical energy generated by driving the engine into an alternating voltage. The AC voltage is converted into a DC voltage by an AC / DC converter. The DC voltage output from the AC / DC converter is converted into a desired AC voltage by the inverter and used for driving the electric motor. Furthermore, it is converted into a desired DC voltage by a DC / DC converter and used for charging a charged portion. The charged part is used for driving the electric motor, for example, when the hydraulic pump cannot be driven only by the engine.

  For example, Patent Document 1 exists as a prior art related to the present invention.

JP 2002-359935 A

  If the cooling system is deficient in the hybrid system in which power running and regenerative operation can be repeated, the temperature in the inverter or the like may exceed a preset value. .

  If the temperature of the inverter or the like becomes equal to or higher than the above specified value, the operation of the inverter is urgently stopped in the hybrid system from the viewpoint of protection of the circuit such as the power element.

  However, when the operation of the inverter is urgently stopped during regeneration, the electric motor and the actuator linked to the electric motor are in a free-run state. When the free run state is entered, the arm connected to the actuator is brought into an uncontrolled state. The uncontrolled state is very dangerous when working with heavy machinery or the like.

  Therefore, the present invention provides a motor drive control device and a hybrid that can prevent an arm or the like interlocking with a motor from entering an uncontrolled state even when the temperature of an inverter or the like exceeds a predetermined value set in advance. It is an object to provide a drive control method for a system and a motor drive control device.

In order to achieve the above object, a motor drive control device according to claim 1 of the present invention includes a charging unit (4) capable of charging a DC voltage, and a DC voltage from the charging unit as an AC voltage. In a motor drive control device comprising an inverter (3) for conversion, a motor (10) driven by the inverter, and a controller in which a first temperature value is set, during the deceleration operation of the motor When the temperature at a predetermined location inside the motor drive control device exceeds the first temperature value, the controller determines a second higher than the first temperature value in accordance with the drive status of the motor. After the motor is stopped driving, the inverter is stopped.
In addition, when the temperature at the predetermined location exceeds the second temperature value, the controller stops the inverter without waiting for the motor to stop driving.
The controller determines the second temperature value based on the kinetic energy of the motor when the temperature at the predetermined location reaches the first temperature value.

  Further, the motor drive control device according to claim 2 is the motor drive control device according to claim 1, wherein the temperature of the predetermined part is changed during the acceleration operation or the constant speed operation of the motor. When the first temperature value is exceeded, the controller does not determine the second temperature value and stops the inverter.

Further, the motor drive control device according to claim 3 is the motor drive control device according to claim 1 or 2 , wherein the notification is made to notify the stop state after or simultaneously with the stop of the inverter. The unit is further provided.

The motor drive control device according to claim 4 is the motor drive control device according to any one of claims 1 to 3 , wherein the temperature of the predetermined portion is arranged in the inverter. It is the temperature near the radiation fin and / or the radiation fin.

A motor drive control device according to a fifth aspect is the motor drive control device according to any one of the first to third aspects , wherein the temperature of the predetermined portion is disposed in the inverter. And / or the temperature near the element.

The motor drive control device according to claim 6 is the motor drive control device according to claim 4 or 5 , wherein the inverter includes a plurality of semiconductor switches, and the second temperature. The value is less than the heat resistance temperature of the semiconductor switch.

A motor drive control device according to a seventh aspect is the motor drive control device according to the first aspect, wherein the temperature of the predetermined portion is a temperature inside the motor.

The motor drive control device according to claim 8 is the motor drive control device according to claim 7 , wherein the motor includes a magnet whose magnetic force decreases when the temperature becomes a predetermined value or more, The second temperature value is less than the predetermined value.

The motor drive control device according to claim 9 is the motor drive control device according to claim 1, further comprising a motor controller unit for controlling the operation of the inverter, It is disposed in the motor controller.

The motor drive control apparatus according to claim 1 0 is the motor drive control apparatus according to claim 1, during the deceleration operation of the motor, the temperature of the predetermined portion in the interior of the drive control device When the first temperature value is exceeded, the controller reduces the carrier frequency of the inverter so that the carrier frequency of the inverter is reduced compared to the state before the first temperature is exceeded. Controls the switching operation.

The hybrid system of claim 1 1, the rotation axis; and (11 111, 112), connected to said rotary shaft, an engine (6) for rotating the rotary shaft is connected to the rotary shaft, A rotating machine (7) that can realize both functions of an electric motor that converts electrical energy into mechanical energy to rotate the rotating shaft and a generator that converts mechanical energy that rotates the rotating shaft into electrical energy. ), A driven part (9) driven by the rotation of the rotating shaft, a motor (10) connected to the rotating shaft and capable of rotating the rotating shaft, and causing the rotating machine to function as the electric motor, A hybrid comprising: a control unit (5) for starting the engine by performing in parallel the control for rotating the rotating shaft by the rotating machine and the control for rotating the rotating shaft by the motor. A charging unit (4) capable of charging a DC voltage; an inverter (3) for converting a DC voltage from the charging unit to an AC voltage; and a controller having a first temperature value set therein. The motor is driven by the inverter, and when the temperature at a predetermined location in the hybrid system exceeds the first temperature value, the controller drives the motor. A second temperature value is determined in accordance with the motor, and after the drive of the motor is stopped, the inverter is stopped, and when the temperature at the predetermined location exceeds the second temperature value, the controller The controller is stopped without waiting for the drive to stop, and the controller has the motor when the temperature at the predetermined location reaches the first temperature value. Based on the kinetic energy shall be specified the second temperature value.

The hybrid system of claim 1 2, a hybrid system of claim 1 1, wherein the controller is arranged in the control unit.

The hybrid system of claim 1 3, a hybrid system of claim 1 1, during deceleration of the motor, the temperature of the predetermined portion in the interior of the drive control device, wherein the When the temperature value of 1 is exceeded, the controller performs the switching operation of the semiconductor switch constituting the inverter so that the carrier frequency of the inverter is reduced as compared with the state before the temperature exceeding the first temperature. Control.

The drive control method of the motor drive control device according to claim 1 4, charging unit capable of charging the DC voltage (4), an inverter (3) for alternating voltage converts the DC voltage from the charging unit And a motor (10) driven by the inverter and a controller in which a first temperature value is set, the drive control method of a motor drive control device comprising: (A) the drive control device Detecting that the temperature at a predetermined location inside the first temperature value exceeds the first temperature value, and (B) determining the motion status of the motor when the temperature reaches the first temperature value ; C) When it is determined that the motor is decelerating as a result of the step (B), a step of determining a second temperature value higher than the first temperature value according to a driving situation of the motor And (D) A step of stopping the inverter after the driving of the motor is stopped ; and (F) when the temperature of the predetermined portion exceeds the second temperature value, the inverter is not waited to stop the driving of the motor. And a step of stopping . In step (C), the controller determines the second temperature value based on the kinetic energy of the motor when the temperature at the predetermined location reaches the first temperature value.

The drive control method of the motor drive control device according to claim 1 5, a drive control method of the motor drive control device according to claim 1 4, (E) the step of (B) results, the The method further includes the step of stopping the inverter without determining the second temperature value when it is determined that the motor is accelerating or operating at a constant speed.

The drive control method of the motor drive control device according to claim 1 6, there is provided a drive control method of the motor drive control device according to claim 14 or claim 15, or after cessation of (G) the inverter A step of notifying the stop state at the same time as the stop is further provided.

The drive control method of the motor drive control device according to claim 17, there is provided a drive control method of the motor drive control device according to claim 1 4, of (H) the step (B) that said motor When the switching operation of the semiconductor switch constituting the inverter is reduced so that the carrier frequency of the inverter is reduced compared to the state before the first temperature is exceeded. The step of controlling is further provided.

  According to a first aspect of the present invention, there is provided a motor drive control device comprising: a charging unit that can charge a DC voltage; an inverter that converts the DC voltage from the charging unit into an AC voltage; a motor driven by the inverter; In a motor drive control device provided with a controller having a temperature value of 1, the temperature at a predetermined location inside the motor drive control device exceeds the first temperature value during the motor deceleration operation. Then, the controller determines a second temperature value higher than the first temperature value according to the driving state of the motor, and stops the inverter after the motor driving is stopped.

Therefore, for example, even if an abnormal temperature is detected at a predetermined location when an actuator or the like is disposed at the tip of the motor, the inverter does not urgently stop. In other words, the emergency stop of the inverter can be prevented until the motor stops. Therefore, it is possible to prevent the actuator from being disabled (free-run state) during the deceleration motion.
When the temperature at the predetermined location exceeds the predetermined second temperature value, the controller stops the inverter without waiting for the motor to stop driving.
Therefore, for example, by setting the second temperature value from the viewpoint of protection of the inverter and the like, it becomes possible to prevent the inverter and the like from being destroyed due to further temperature rise.
Further, the controller determines the second temperature value based on the kinetic energy of the motor when the temperature at the predetermined location reaches the first temperature value.
Accordingly, the second temperature value setting that is unnecessarily high can be prevented, and an appropriate second temperature value setting according to the operation state can be performed.

  According to a second aspect of the present invention, in the motor drive control device according to the second aspect of the invention, when the temperature at a predetermined location exceeds the first temperature value during the acceleration operation or constant speed operation of the motor, the controller Stop the inverter without setting the temperature value.

  Even if the inverter is urgently stopped during the acceleration operation or constant speed operation of the motor, the actuator free run does not occur. Therefore, when an abnormal temperature is detected at a predetermined location during the acceleration operation or the like, the inverter can be urgently stopped without performing an unnecessary second temperature value setting process.

In addition, the motor drive control device according to a third aspect of the present invention further includes a notification unit that notifies the stop state after or simultaneously with the stop of the inverter.

  Therefore, the user can easily know that the inverter has stopped due to the occurrence of a temperature abnormality in the motor drive control device.

In the motor drive control device according to the fourth aspect , the temperature at the predetermined location is a temperature in the vicinity of the radiation fin and / or the radiation fin provided in the inverter.

  A temperature sensor can be easily installed on the radiation fin. Therefore, it is possible to easily measure a temperature that relatively matches the inverter temperature.

In the motor drive control device according to the fifth aspect , the temperature at the predetermined location is the temperature of the element disposed in the inverter and / or the vicinity of the element.

  Therefore, motor drive control can be performed according to the temperature of the element that is sensitive to temperature rise, and the element can be prevented from being destroyed by high temperatures.

In the motor drive control device according to the sixth aspect , the inverter includes a plurality of semiconductor switches, and the second temperature value is lower than the heat resistant temperature of the semiconductor switches.

  Thus, the second temperature value is lower than the heat resistance temperature of the semiconductor switch. Therefore, by determining the second temperature value, it is possible to prevent the semiconductor switch from being broken even if the temperature becomes high.

In the motor drive control device according to the seventh aspect , the temperature at the predetermined location is a temperature inside the motor.

  Therefore, abnormal driving of the motor due to abnormal temperature rise can be suppressed / prevented.

In the motor drive control device according to claim 8 , the motor includes a magnet whose magnetic force decreases when the temperature becomes equal to or higher than a predetermined value, and the second temperature value is less than the predetermined value.

  Therefore, by determining the second temperature value, it is possible to prevent the motor from being abnormally driven even when the temperature becomes high.

According to a ninth aspect of the present invention , the motor drive control device further includes a motor controller unit for controlling the operation of the inverter, and the controller is disposed in the motor controller unit.

  Therefore, even if a controller for setting the second temperature value is provided, an increase in the volume of the entire motor drive control device can be suppressed.

Further, the motor drive control device according to claim 1 0, during deceleration of the motor, when the temperature of the predetermined portion inside of the drive control device exceeds a first temperature value, the controller, first The switching operation of the semiconductor switch that constitutes the inverter is controlled so that the carrier frequency of the inverter is reduced as compared with the previous state of exceeding the temperature.

  Therefore, heat generation due to the switching loss of the semiconductor switch constituting the inverter is reduced, and as a result, heat generation of the entire device can be suppressed. Further, the eddy current loss (iron loss) of the motor is also reduced. Therefore, the temperature rise of the motor can be suppressed, and the motor stop due to the thermal error is reduced.

The hybrid system of claim 1 1 includes a rotating shaft, is connected to a rotary shaft, an engine for rotating the rotating shaft, is connected to the rotating shaft, the rotating shaft of the electric energy is converted to mechanical energy A rotating machine capable of realizing both functions of an electric motor for rotating the rotating shaft and a generator for converting mechanical energy for rotating the rotating shaft into electric energy, a driven part driven by rotation of the rotating shaft, and a rotating shaft Connected to the motor, and the rotation machine can be operated as an electric motor, and the control for rotating the rotation axis by the rotation machine and the control for rotating the rotation axis by the motor are performed in parallel to start the engine. A hybrid system comprising: a control unit for charging: a charging unit capable of charging a DC voltage; an inverter for converting a DC voltage from the charging unit into an AC voltage; A controller in which the temperature value is set, and the motor is driven by an inverter, and when the temperature at a predetermined location in the hybrid system exceeds the first temperature value, the controller The second temperature value is determined according to the driving state of the motor, and after the motor driving is stopped, the inverter is stopped, and when the temperature at the predetermined location exceeds the second temperature value, the controller Without waiting for the motor to stop driving, the inverter is stopped, and the controller performs the first operation based on the kinetic energy of the motor when the temperature at the predetermined location reaches the first temperature value. It shall be determined the temperature values of the two.

  Therefore, a hybrid system including the motor drive control device according to claim 1 can be provided. Therefore, in the hybrid system, the free-run state of the driven part can be prevented.

Further, in a hybrid system according to claim 1 2, the controller is arranged in the control unit.

  Therefore, even if a controller for setting the second temperature value is provided, an increase in the volume of the entire hybrid system can be suppressed.

Further, in a hybrid system according to claim 1 3, during deceleration of the motor, when the temperature of the predetermined portion inside of the drive control device exceeds a first temperature value, the controller, the first temperature The switching operation of the semiconductor switch constituting the inverter is controlled so that the carrier frequency of the inverter is reduced as compared with the previous state exceeding.

  Therefore, heat generation due to the switching loss of the semiconductor switch constituting the inverter is reduced, and as a result, heat generation of the entire device can be suppressed. Further, the eddy current loss (iron loss) of the motor is also reduced. Therefore, it is possible to provide a hybrid system that can suppress an increase in the temperature of the motor and reduce the motor stop due to a thermal error.

The drive control method of the motor drive control device according to claim 1 4, a charging unit capable of charging a DC voltage, an inverter for AC voltage converts the DC voltage from the charging unit, is driven by an inverter A drive control method of a motor drive control device comprising a motor and a controller in which a first temperature value is set, wherein (A) the temperature at a predetermined location inside the drive control device is the first The step of detecting exceeding the temperature value of ( 1 ), (B) the step of determining the movement status of the motor when the first temperature value is reached , and (C) the result of step (B) is that the motor is decelerating. If it is determined that there is a step, a step of determining a second temperature value higher than the first temperature value according to the driving status of the motor, and (D) a step of stopping the inverter after the driving of the motor is stopped. , (F) stopping the inverter without waiting for the motor to stop when the temperature at the predetermined location exceeds the second temperature value . In step (C), the controller determines the second temperature value based on the kinetic energy of the motor when the temperature at the predetermined location reaches the first temperature value.

Therefore, the motor drive control device according to claim 1 having a free-run state prevention effect can be provided by causing the motor drive control device to perform the method.
Further, by setting the second temperature value from the viewpoint of protection of the inverter or the like by the step (F), for example, it becomes possible to prevent the inverter or the like from being destroyed due to further temperature rise.

Further, in the drive control method of the motor drive control device according to claim 15 , when it is determined that (E) step (B) indicates that the motor is accelerating or operating at a constant speed, The method further includes a step of stopping the inverter without determining the temperature value of the inverter.

  Therefore, in the case of the acceleration operation or the constant speed operation of the motor, when the temperature at the predetermined location exceeds the first temperature value, the step of determining the second temperature value is omitted, and the inverter is stopped. be able to. Note that a free-run state cannot occur when the motor is accelerating.

The drive control method of the motor drive control device according to claim 16 further includes (G) a step of notifying the stop state after or simultaneously with the stop of the inverter.

  Therefore, the user can be made aware of the stop of the inverter.

Further, in the drive control method of the motor drive control device according to claim 17 , if it is determined that the motor is decelerating as a result of (H) step (B), the drive control method before the first temperature is exceeded. The method further includes the step of controlling the switching operation of the semiconductor switch constituting the inverter so that the carrier frequency of the inverter is reduced as compared with the state.

  Therefore, heat generation due to the switching loss of the semiconductor switch constituting the inverter is reduced, and as a result, heat generation of the entire device can be suppressed. Further, the eddy current loss (iron loss) of the motor is also reduced. Therefore, it is possible to provide a drive control method for a motor drive control device that can suppress an increase in the temperature of the motor and reduce motor stoppage due to a thermal error.

  First, the configuration and operation of a general hybrid system will be described.

<Configuration of hybrid system>
FIG. 1 is a diagram conceptually showing the configuration of the hybrid system. The hybrid system includes an engine 6, a rotating machine 7, a clutch 8, a driven part 9, a motor 10, a rotating shaft 11, and a voltage conversion device 100. Here, the rotating shaft 11 includes rotating shaft portions 111 and 112.

  The engine 6 is connected to the rotation shaft portion 111 and can rotate the rotation shaft portion 111. The engine 6 is controlled by, for example, an engine controller. Specifically, for example, a governor is connected to the engine. And an engine controller gives a command value to a governor, and controls an engine via a governor.

  The rotating machine 7 is connected to the rotating shaft part 111. A generator is adopted as the rotating machine 7, and mechanical energy that rotates the rotating shaft portion 11 is converted into electric energy to output an alternating voltage. As a result, the alternating current I1 flows to the voltage converter 100.

  For example, the rotating machine 7 may function as an electric motor. In this case, the electrical energy given from the voltage converter 100 is converted into mechanical energy that rotates the rotating shaft 111.

  The driven portion 9 is connected to the rotating shaft portion 112 and is driven by the rotation of the rotating shaft portion 112. For example, a hydraulic pump can be used as the driven portion 9. Further, at the tip of the hydraulic pump, for example, an actuator or an arm of a heavy machine is disposed.

  The motor 10 is connected to the rotation shaft portion 112 and can rotate the rotation shaft portion 112. The motor 10 is driven by an AC voltage supplied from the voltage conversion device 100. More specifically, the motor 10 is driven by the inverter 3. At this time, AC 12 flows from voltage conversion device 100 to motor 10.

  The clutch 8 is provided between the rotating shaft portion 111 and the rotating shaft portion 112, and can be brought into contact or non-contact.

  In general, in a hybrid system, the engine 6 is operated in a constant state at an efficient point. Further, the capacity of the rotating machine (generator) 7 is configured to have an optimum power generation efficiency when the engine 6 is operated. Further, when the hydraulic pump instantaneously needs a large power, the motor 10 is driven at the maximum power by the electric energy stored in the charging unit 4 and the control of the inverter 3.

  Moreover, the specification regarding the induced voltage of the rotating machine (generator) 7 is a specification such that the bus voltage does not exceed a specified value when the rotational speed of the engine 6 is maximum. Therefore, it is often lower than the bus voltage during normal operation, and the voltage is boosted to a predetermined value by the AC-DC converter 7.

  FIG. 2 is a circuit diagram conceptually showing the voltage converter 100. In addition, in FIG. 1, the structure of the voltage converter is shown with the block diagram.

  The voltage conversion device 100 includes an AC / DC converter 1, a DC / DC converter 2, an inverter 3, a charging unit 4, and a control unit 5.

  The AC / DC converter 1 converts the alternating voltage output from the generator 7 into a direct voltage, and outputs this to the output terminals 11 and 12 that it has. A higher potential than the output terminal 11 is output to the output terminal 12. Specifically, as shown in FIG. 2, the AC / DC converter 1 includes a three-phase rectifier circuit composed of an IGBT (Insulated Gate Bipolar Transistor: a semiconductor element, more specifically, a semiconductor switch) module. Can be adopted. The output terminal 11 is connected to the emitter side of the IGBT module, and the output terminal 12 is connected to the collector side of the IGBT module.

  A capacitor C1 may be connected between the output terminals 11 and 12. Thereby, the DC voltage output from the AC / DC converter 1 can be smoothed.

  The DC / DC converter 2 converts the DC voltage output from the AC / DC converter 1 into a desired DC voltage, and supplies this to the charging unit 4.

  Specifically, the DC / DC converter 2 includes input terminals 21 and 22, output terminals 23 and 24, transistors Tr1 and Tr2, diodes Di1 and Di2, a reactor L, and a capacitor C2. In the circuit diagram shown in FIG. 2, IGBTs are employed as the transistors Tr1 and Tr2.

  Input terminals 21 and 22 are connected to output terminals 11 and 12 of AC / DC converter 1, respectively.

  The collector of the transistor Tr1 is connected to the input terminal 22. This can be grasped when the collector of the transistor Tr1 is connected to either one of the input terminals 21 and 22 (input terminal 22) having a higher potential than the other. This is because a higher potential than the output terminal 11 is output to the output terminal 12 of the AC / DC converter.

  The diode Di1 has an anode connected to the emitter of the transistor Tr1 and a cathode connected to the collector of the transistor Tr1. The transistor Tr <b> 2 has a collector connected to the emitter of the transistor Tr <b> 1 and a collector connected to both the input terminal 21 and the output terminal 23. The reactor L is connected between the emitter of the transistor Tr1 and the output terminal 24. The capacitor C2 is connected between the output terminals 23 and 24.

  According to such a configuration of the DC / DC converter 2, the DC / DC converter 2 can function as a step-down chopper. Therefore, the DC voltage output from the AC / DC converter 1 can be lowered to a desired DC voltage.

  The charging unit 4 is connected to the output terminals 23 and 24 and is charged with a DC voltage output from the DC / DC converter 3.

  The inverter 3 has input terminals 31 and 32, and each is connected to the output terminals 11 and 12 of the AC / DC converter 1. The inverter 3 converts the DC voltage output from the AC / DC converter 1 into a desired AC voltage. Specifically, as shown in FIG. 2, a three-phase inverter circuit composed of an IGBT module (which can be grasped as a semiconductor element, more specifically a semiconductor switch) can be adopted as the inverter 3.

  A capacitor C3 may be connected between the input terminals 31 and 32. Thereby, the DC voltage input to the inverter 3 can be smoothed.

  The control unit 5 includes CPUs (Central Processing Units) 51 to 53. However, the control part 5 may be comprised by one CPU, for example. The CPU 51 controls the AC / DC converter 1, the CPU 52 controls the DC / DC converter 2, and the CPU (which can be grasped as a motor controller unit) 3 controls the inverter 3. Specifically, the CPU 51 detects the current output from the generator 7, and gives a gate signal to the IGBT of the AC / DC converter 1 based on this to control the switching of the IGBT. Further, the CPU 53 detects a current applied to the motor 10, and gives a gate signal to the IGBT of the inverter 3 based on the detected current to control the switching of the IGBT. For these controls, for example, PWM (Pulse Width Modulation) control can be employed. The CPU 52 controls switching of the transistors Tr1 and Tr2.

  That is, the control unit 5 causes the rotating machine 7 to function as an electric motor. And the control part 5 performs the control which rotates the rotating shaft 11 in the rotary machine 7, and the control which rotates the rotating shaft 11 in the motor 10 in parallel, and starts the engine 6. FIG.

  The charging unit 4, the inverter 3, the motor 10, and the controller mentioned in each embodiment form a motor drive control device.

<Powering and regeneration in hybrid systems>
In the hybrid system, when the arm disposed at the tip of the driven unit 9 is swung, power running and regeneration are frequently repeated.

  Here, power running is an operation in a direction in which energy (current) flows from the voltage conversion device 100 (more specifically, the inverter 3, the DC-DC converter 2, etc.) to the motor 10. This is an operation to give work to 9. The regeneration is an operation in a direction in which energy (current) flows from the motor 10 to the voltage conversion device 100 (more specifically, the inverter 3, the DC-DC converter 2, etc.). This is an operation of absorbing the kinetic energy possessed by as electrical energy.

  The upper part of FIG. 3 is a diagram illustrating a change in the DC bus voltage due to power running / regeneration in the hybrid system. Further, the lower part of FIG. 3 shows the capacity of the charging unit 4 and shows a case where the charging capacity is 100% for the sake of simplicity. Therefore, energy absorption into the charging unit 4 does not occur.

  As shown in the upper part of FIG. 3, during power running, the generated energy is kept constant at an appropriate voltage. However, during regeneration, the DC bus voltage rises. This indicates that kinetic energy of the motor 4 or the like is converted into electric energy, and the electric energy is absorbed by the voltage conversion device 100. Here, if the charging capacity of the charging unit 4 is less than 100%, a part or all of the electric energy is charged in the charging unit 4. Note that after regeneration, the DC bus voltage drops to an appropriate voltage.

  FIG. 4 is a diagram showing the number of rotations of the motor 4 when the temperature of the inverter or the like is normal. Here, the upper part of FIG. 4 is a diagram showing a change in the rotational speed of the motor 4 due to power running / regeneration. Further, the middle part of FIG. 4 is a diagram illustrating a change in current in, for example, the voltage converter 100 accompanying power running / regeneration. Moreover, the lower stage of FIG. 4 is a figure which shows the change of the temperature of the radiation fin or motor accompanying power running and regeneration. The radiating fin is fixed to the inverter 3 in order to radiate the heat generated inside the inverter 3 to the outside.

  As shown in FIG. 4, at the time of power running, the rotational speed of the motor 4 increases / constant (that is, acceleration motion / constant speed motion), and at the time of regeneration, the rotational speed of the motor 4 decreases to zero (that is, deceleration motion / Stop). Further, the current flowing in the voltage conversion device 100 generally flows in the opposite direction during power running and during regeneration. In addition, the temperature of the radiation fins (which can be grasped as the temperature in the inverter 3 and the temperature of the semiconductor switch) rises and falls with repeated power running and regeneration. This occurs due to heat generation of the semiconductor switch. Note that during normal operation, the temperature of the heat dissipating fins and the like does not rise above the first temperature value.

  However, if the fan for heat dissipation stops due to failure or the clogging of the filter installed in the fan worsens, the cooling process is hindered. Then, as shown in the lower part of FIG. 5, the temperature of the radiation fins may reach the first temperature value during regeneration. In the conventional hybrid system, when the temperature of the heat radiating fins reaches the first temperature value, the inverter 3 is urgently used from the viewpoint of protecting the hybrid system (particularly, the semiconductor switch elements constituting the inverter 3 etc.). It was stopped (that is, the semiconductor switch was completely turned off).

  By such an emergency stop of the inverter 3, the current flowing through the voltage conversion device 100 becomes zero (middle stage in FIG. 5). That is, the motor that is being decelerated enters a free-run state due to the emergency stop (upper stage in FIG. 5). When the free-run state is entered, the arm or the like that has been controlled to decelerate until then is brought into an uncontrolled state. The uncontrolled state of the arm is continued until kinetic energy is consumed due to friction or the like. This uncontrolled state is very dangerous.

  Therefore, the present invention includes a controller (not shown in FIGS. 1 and 2) described below. Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

<Embodiment 1>
The first temperature value is set in the controller. Furthermore, when the temperature of a predetermined location in the motor drive control device or the hybrid system described above exceeds the first temperature value during the deceleration operation of the motor 10, the controller responds to the drive status of the motor 10. Then, a second temperature value higher than the first temperature value is determined. And the said controller stops the inverter 3, after the drive of the motor 10 stops.

  Here, for example, the temperature of the heat dissipating fins and / or the vicinity of the heat dissipating fins disposed in the inverter 3 can be adopted as the temperature of the predetermined portion. Further, the temperature at a predetermined location may be an element disposed in the inverter 3 and / or a temperature near the element.

  The second temperature value is lower than the heat resistance temperature of the plurality of semiconductor switches (IGBTs) constituting the inverter 3. That is, from the viewpoint of preventing damage to the semiconductor switch due to high heat, the upper limit of the second temperature value is lower than the heat resistant temperature of the semiconductor switch.

  The controller is based on the kinetic energy of the motor 10 (including the actuator, arm, etc. disposed at the tip of the driven unit 9) when the temperature at the predetermined location reaches the first temperature value. The second temperature value is determined. That is, when the first temperature value is reached, the kinetic energy of the operating part is estimated. Then, the kinetic energy is converted as electric energy, and the temperature that can be increased when the electric energy is absorbed by the voltage conversion unit 100 is evaluated. Then, the controller determines a value obtained by adding the temperature after the evaluation to the first temperature value as the second temperature value.

  When the temperature of the predetermined portion exceeds the first temperature value during the acceleration operation or constant speed operation of the motor 10, the controller stops the inverter 3 without determining the second temperature value described above. Let

  When the second temperature is set and the temperature at the predetermined location described above exceeds the second temperature value, the controller stops the inverter 3 without waiting for the motor 10 to stop driving. Let

  The hybrid system (or motor drive control device) is provided with a notification unit (not shown in FIGS. 1 and 2). The controller notifies the stop state via the notification unit after or simultaneously with the stop of the inverter 3. Here, as the notification method, a method using voice, a method using a buzzer, a method using display, a method using lighting / flashing with light, or a combination thereof can be adopted.

  The controller can also be configured by a separate and independent CPU. Further, a controller can be disposed in the control unit 5. Further, the controller may be disposed in the above-mentioned CPU (which can be grasped as a motor controller) 53 that controls the operation of the inverter 3. That is, it is possible to adopt a configuration in which one CPU 53 has a function of the controller and a function as a motor controller unit.

  Next, the operation when an abnormal temperature occurs in the hybrid system according to the present embodiment will be described. In the present embodiment, the controller performs the above-described series of operations based on the temperature of the radiating fins arranged with respect to the inverter 3 (or the temperature of the semiconductor switch constituting the inverter 3). . FIG. 6 is a flowchart showing an operation flow when an abnormal operation occurs in the hybrid system according to the present embodiment.

  Assume that an abnormality occurs in a cooling system such as a fan while the hybrid system repeats power running and regeneration. Then, as shown in the lower part of FIG. 7, it is assumed that the temperature of the radiating fin reaches and exceeds the first temperature value preset in the controller (step S1). That is, the controller is monitoring the temperature sensor attached to the radiation fin, and the controller detects that the detection result of the temperature sensor has reached and exceeded the first temperature value (step S1). ).

  Here, the first temperature value is a value set for the purpose of detecting that an abnormality has occurred in the cooling system that cools the inverter 3 and the like. That is, if the cooling system is normal, the temperature of the radiating fin does not reach the first temperature value.

  After step S1, the controller determines the movement status of the motor 10 (including the arm disposed at the tip of the driven unit 9) when the first temperature value is reached (step S2).

  For example, the controller monitors the rotation speed of the motor 10. In step S2, the controller determines whether the motor 10 is in a power running state (acceleration operation and constant speed operation of the operating unit) or in a regenerative state (deceleration operation of the operating unit) based on the change in the rotational speed of the motor 10 over time. Determine if there is.

  If the controller detects that the motor 10 is in the power running state, it becomes “power running” in step S2, and the controller immediately stops the inverter 3 without performing the second temperature value setting process described above. (Step S3). Then, at the same time as or after the inverter 3 is stopped, the controller controls the notification unit to notify the user that the inverter 3 has stopped (step S4).

  Thus, the reason why the inverter 3 is immediately stopped at the time of power running is that the free running state of the arm or the like does not need to be regarded as a problem in the power running state.

  Returning to step S2, it is assumed that the controller detects that the motor 10 is in the regenerative state ("regeneration" in step S2). In this case, the controller operates the motor 10 (the operating part including the arm disposed at the tip of the driven part 9) at the time of step S2 (that is, when the temperature of the heat radiating fin reaches the first temperature value). The kinetic energy possessed by the device can be estimated (step S5).

  Schematically, the kinetic energy = (energy supplied to the operating unit during powering) − (energy during regeneration consumed by the operating unit up to step S1).

  For example, the moment of inertia of an arm or the like connected to the tip of the driven unit 9 is known due to the system configuration. Further, the moment of inertia added to the arm or the like during power running can be estimated from the motor current and responsiveness when the motor 10 is accelerated. The energy supplied to the operating part at the time of powering is obtained from each moment of inertia. Furthermore, if the energy at the time of regeneration consumed by the operation part by step S1 can be estimated, the said kinetic energy can be estimated.

  Next, the controller determines a second temperature value higher than the first temperature value in accordance with the driving state of the motor 10 (see step S6, the lower part of FIG. 7). More specifically, the controller determines the second temperature value according to the kinetic energy of the regenerative motor 10 (operating unit) at the time of steps S1 and S2 (step S6).

  For example, from the kinetic energy of the motor 10 (operating part), the rising temperature T [° C.] in the radiating fin is obtained based on the following equation.

T = (1/2) · CJv {1- (η / 100)} (1)
Here, J [kg · m2] is the inertia of the operating part. v [m / s] is the speed of the operating part. η [%] is the inverter efficiency. C [° C./W] is the heat capacity of the semiconductor switch and the heat sink (radiation fin) constituting the inverter 3.

  For example, the inertia J of the operating part can be obtained by the following equation.

J = ∫tqdt / (v2-v1) (2)
Here, v1 [m / s] is the speed before acceleration (deceleration). v2 [m / s] is the speed after acceleration (deceleration). tq [N · m] is a torque (instantaneous value) during acceleration (deceleration). That is, from the equation (2), it can be seen that the inertia can be obtained by dividing the sum of the torques applied during a certain period by the speed change during the period.

  In Formula (1), the energy used as the loss which considered the efficiency of the inverter 3 from the recovered electric power required in order to stop the motor 10 (operating part) is calculated. And since the said loss turns into heat, the temperature rise T in the radiation fin until the motor 10 stops after Steps S1 and 2 is obtained from the relationship with the heat capacity of the components including the semiconductor switch and the radiation fin. Therefore, the controller can determine the second temperature value which is the first temperature value + the increased temperature T.

  After setting the second temperature value (after step S6), the controller monitors the rotational speed of the motor 10. Then, the controller determines whether or not the rotation speed of the motor 10 is “0”, that is, whether or not the rotation / drive of the motor 10 is stopped (step S7).

  In step S7, when the controller determines that the rotation speed of the motor 10 is not 0 (that is, the motor 10 is still moving, “N” in step S7), the rotation speed of the motor 10 is 0. Until it is determined, the monitoring of the rotation speed of the motor 10 and the determination in step S7 are continued.

  Here, the determination in step S7 may be performed intermittently or continuously. However, if the controller determines in step S7 that the rotation of the motor 10 is not 0, the controller again performs the step after a predetermined time. The determination in S7 may be made. That is, a configuration in which the controller discretely determines in step S7 may be employed.

  On the other hand, when the controller determines in step S7 that the rotation speed of the motor 10 is 0 (that is, when the drive of the motor 10 is stopped as shown in the upper part of FIG. 7, “Y” in step S7). The controller stops the inverter 3 (see step S8, current value zero in the middle stage of FIG. 7). Then, at the same time as or after the inverter 3 is stopped, the controller controls the notification unit to notify the user that the inverter 3 has stopped (step S4).

  Although not shown in the flowchart of FIG. 6, it is assumed that the temperature of the heat radiating fin reaches and exceeds the second temperature value after the setting of the second temperature value (step S6). In such a case, the inverter 3 is stopped without waiting for the motor 10 to stop driving from the viewpoint of preventing destruction of the elements and semiconductor switches (IGBTs) provided in the inverter 3 and the like due to high temperatures. .

  As described above, in the present embodiment, when the temperature at a predetermined location exceeds the first temperature value during the deceleration operation of the motor 10, the controller (not shown in FIGS. 1 and 2) The second temperature value is determined according to the driving state. Then, the controller stops the inverter 3 after the driving of the motor 10 is stopped.

  Therefore, for example, even when an abnormal temperature is detected at a predetermined location in the case where an actuator, an arm, or the like is disposed at the tip of the motor 10, the inverter 3 does not urgently stop. That is, it is possible to prevent the emergency stop of the inverter 3 until the motor 10 stops. Therefore, it is possible to prevent the actuator from being disabled (free-run state) during the deceleration motion. That is, even if an abnormal temperature is detected at a predetermined location during the regenerative operation, it is possible to avoid the actuator and the arm from being uncontrollable.

  In the present embodiment, the controller does not determine the second temperature value when the temperature of the predetermined location exceeds the first temperature value during the acceleration operation or the constant speed operation of the motor 10. Then, the inverter 3 is stopped.

  Even if the inverter 3 is urgently stopped during the acceleration operation or constant speed operation of the motor, free run of the actuator or arm does not occur (or does not cause a problem). Therefore, when an abnormal temperature is detected at a predetermined location during the acceleration operation or the like, the inverter 3 can be urgently stopped without performing an unnecessary second temperature value setting process.

  In the present embodiment, when the temperature at a predetermined location exceeds a predetermined second temperature value, the controller stops the inverter 3 without waiting for the motor 10 to stop driving.

  Therefore, for example, by setting the second temperature value from the viewpoint of protecting the element (IGBT) and the like disposed in the inverter 3, it is possible to prevent the inverter 3 and the like from being destroyed due to further temperature rise. It becomes.

  Moreover, in this Embodiment, the alerting | reporting part (not shown in FIG. 1, 2) which alert | reports the condition of the said stop is further provided after the inverter 3 stops or simultaneously with a stop.

  Therefore, the user can easily know that the inverter 3 has stopped due to the occurrence of a temperature abnormality in the motor drive control device or the hybrid system (due to the occurrence of a high temperature).

  In the present embodiment, the controller determines the second temperature value based on the kinetic energy possessed by the motor 10 (including an operating part such as an arm).

  Accordingly, the second temperature value setting that is unnecessarily high can be prevented, and an appropriate second temperature value setting according to the operation state can be performed.

  Further, in the present embodiment, the temperature at the predetermined location is the temperature of the heat dissipating fins disposed in the inverter 3.

  A temperature sensor can be easily installed on the radiation fin. Therefore, it is possible to easily measure a temperature that relatively matches the temperature of the inverter 3. Needless to say, the temperature at the predetermined location may be the temperature of the radiation fin itself or the ambient temperature near the radiation fin.

  In the present embodiment, the temperature at a predetermined location is the temperature of an element (for example, a semiconductor switch such as an IGBT) disposed in the inverter 3.

  Therefore, the drive control of the motor 10 can be performed according to the temperature of the element that is sensitive to the temperature rise, and the element can be prevented from being destroyed by the high temperature. Needless to say, the temperature at the predetermined location may be the temperature of the element itself or the ambient temperature near the element.

  In the present embodiment, inverter 3 includes a plurality of semiconductor switches (IGBTs), and the second temperature value is lower than the heat resistance temperature of the semiconductor switches.

  Secondly, when the temperature value is reached and exceeded, the inverter 3 is stopped regardless of the driving state of the motor 10. Therefore, the first temperature value is determined by determining the second temperature value that is lower than the heat resistant temperature of the semiconductor switch. Even if the temperature becomes higher, the semiconductor switch can be prevented from being broken.

  In the present embodiment, a controller is arranged in a CPU (motor controller unit) 53 that controls the operation of the inverter 3.

  Therefore, even if a controller for setting the second temperature value is provided, it is possible to suppress an increase in the volume of the entire motor drive control device or the entire hybrid system. In addition, even if it comprises so that a controller may be arrange | positioned inside the control part 5, the effect similar to the said effect can be acquired.

<Embodiment 2>
In the first embodiment, the controller performs the series of operations / controls shown in FIG. 6 based on the temperature of the heat dissipating fins arranged with respect to the inverter 3 (or the temperature of the semiconductor switch constituting the inverter 3). It was carried out.

  On the other hand, in the second embodiment, the controller performs a series of operations / controls such as setting the second temperature value based on the temperature inside the motor 10. Hereinafter, the invention according to the present embodiment will be described in detail. In the present embodiment, only matters different from the first embodiment will be described in detail. Therefore, matters other than the following are basically the same as those described in the first embodiment.

  When the temperature at a predetermined location inside the motor drive control device or the hybrid system (in this embodiment, the temperature inside the motor 10) exceeds the first temperature value during the deceleration operation of the motor 10, the controller Determines a second temperature value higher than the first temperature value in accordance with the driving state of the motor 10. And the said controller stops the inverter 3, after the drive of the motor 10 stops.

  Here, the first temperature value is a value set for the purpose of detecting that an abnormality has occurred in the motor 10. That is, if the motor 10 or the entire hybrid system is normal, the temperature inside the motor 10 does not reach the first temperature value.

When the motor 10 includes a magnet whose magnetic force decreases when the temperature becomes equal to or higher than a predetermined value, the second temperature value is less than the predetermined value. That is, the upper limit of the second temperature value is less than the predetermined value from the viewpoint of preventing characteristic changes due to high heat of the magnets constituting the motor 10. The second temperature value, as described in the first embodiment, when the temperature of the predetermined portion reaches the first temperature value, the motor 10 (disposed above the driven part 9 (Including actuators, arms, etc.)

  The operation of the hybrid system according to the present embodiment when an abnormal temperature occurs is almost the same as the series of operations shown in FIG. Here, in the present embodiment, in step S1 of FIG. 6, the controller detects that the temperature inside the motor 10 has reached and exceeded the first temperature value preset in the controller.

  In addition, when the motor 10 includes a magnet whose magnetic force decreases when the temperature becomes equal to or higher than a predetermined value, the upper limit of the second temperature value set in step S6 in FIG. Less than the value.

  Needless to say, in equations (1) and (2), constants and the like are determined from the viewpoint of the internal temperature of the motor 10.

  Also in the present embodiment, after the setting of the second temperature value (step S6), when the internal temperature of the motor 10 reaches the second temperature value and exceeds it, the motor 10 is disposed in the motor 10. The inverter 3 is stopped without waiting for the motor 10 to stop driving from the viewpoint of preventing the change in the characteristics of the magnets.

  As described above, in the present embodiment, the temperature at the predetermined location is the temperature inside the motor. Therefore, abnormal driving of the motor 10 due to an abnormal temperature rise can be suppressed / prevented.

  In the present embodiment, the motor 10 includes a magnet whose magnetic force decreases when the temperature becomes equal to or higher than a predetermined value, and the second temperature value is less than the predetermined value.

  Therefore, for example, it is possible to prevent a change in the characteristics of the magnet disposed in the motor 10. Therefore, abnormal driving of the motor 10 due to abnormal temperature rise can be reliably suppressed / prevented.

  In a general hybrid system, the internal temperature of the inverter 3 is higher than the internal temperature of the motor 10. Therefore, the first embodiment is more desirable from the viewpoint of preventing destruction of the elements and the like disposed in the inverter 3 due to high temperature.

  In each embodiment, the second temperature value is estimated based on the kinetic energy. However, since the voltage change in the voltage conversion device 100 is extremely small compared to the current change, it is based on the amount of current flowing in the voltage conversion device 100 during power running and the amount of current flowing in the device 100 during regeneration by steps S1 and S2. The controller may be configured to estimate the second temperature value.

<Embodiment 3>
The motor drive control device according to the present embodiment and the hybrid system having the motor drive control device are characterized in controlling the switching operation of the semiconductor switch constituting the inverter 3.

  Specifically, it is assumed that the temperature at a predetermined location inside the drive control device exceeds the first temperature value. At this time, the controller determines the motion status of the motor 10 (see step S2 in FIG. 6). As a result, it is assumed that the controller determines that the motor 10 is decelerating when it exceeds the first temperature value (determined as a regenerative state). In this case, the controller controls the switching operation of the semiconductor switch so that the carrier frequency of the inverter 3 is reduced as compared with the state before the first temperature is exceeded.

  Here, the control step of the switching operation is performed at any stage between step S2 and step S7 in FIG. In consideration of the effects of the invention according to the present embodiment, which will be described later, it is preferable to perform the control step as early as possible.

  FIG. 8 is a diagram illustrating an example of a switching operation state of the semiconductor switch when the signal wave is subjected to PWM modulation (pulse width modulation) at the carrier frequency (carrier wave) f before exceeding the first temperature. On the other hand, FIG. 9 shows the switching of the semiconductor switch when the carrier frequency (carrier wave) is set to ½f and the signal wave is PWM-modulated (pulse width modulation) after the control step of the switching operation is performed. It is a figure which shows an example of an operation state. 8 and 9, even if the carrier frequency is reduced for the same signal wave before and after the execution of the control step of the switching operation, the average voltage value of the PWM-modulated output voltage for the signal wave does not change. It can be seen that only the number of switching operations is halved.

  As described above, in the present embodiment, the controller controls the switching operation of the semiconductor switch so that the carrier frequency of the inverter 3 is reduced.

  Therefore, the heat generation due to the switching loss of the semiconductor switch constituting the inverter 3 is reduced, and as a result, the heat generation of the entire device can be suppressed. This increases the time during which the inverter 3 can be driven without stopping the inverter 3 due to heat generation. Therefore, the arm or the like can be safely stopped. Moreover, the eddy current loss (iron loss) of the motor 10 is also reduced. Therefore, the temperature rise of the motor 10 can be suppressed, and the motor stop due to a thermal error is reduced.

It is a figure which shows the structure of a hybrid system. It is a figure which shows the internal structure of a voltage converter. It is a figure which shows the DC voltage change inside a voltage converter at the time of power line and regeneration. It is a figure which shows the rotation speed of a motor, the electric current inside a voltage converter, and the temperature change of the predetermined location inside a system at the time of power / regeneration. It is a figure for demonstrating the operation | movement at the time of abnormal temperature in the conventional hybrid system. It is a flowchart for demonstrating the flow of operation | movement of the hybrid system which concerns on this invention. It is a figure which shows the temperature change of the rotation speed of a motor, the electric current inside a voltage converter, and the predetermined | prescribed location inside a system at the time of the power line and regeneration at the time of this invention being applied. It is a figure which shows an example of the switching operation state of the carrier frequency (carrier wave) f, a signal wave, and a semiconductor switch before exceeding 1st temperature. It is a figure which shows an example of the switching operation state of carrier frequency (carrier wave) 1 / 2f, a signal wave, and a semiconductor switch after implementation of the control step of switching operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC / DC converter 2 DC / DC converter 3 Inverter 4 Charging part 5 Control part 6 Engine 7 Rotating machine 9 Driven part 10 Motor 11 Rotating shaft 100 Voltage converter

Claims (17)

A charging unit (4) capable of charging a DC voltage;
An inverter (3) for converting a DC voltage from the charging unit to an AC voltage;
A motor (10) driven by the inverter;
In a motor drive control device comprising a controller in which a first temperature value is set,
When the temperature of a predetermined location in the motor drive control device exceeds the first temperature value during the motor deceleration operation, the controller
According to the driving status of the motor, a second temperature value higher than the first temperature value is determined, and after the driving of the motor is stopped, the inverter is stopped ,
When the temperature at the predetermined location exceeds the second temperature value, the controller does not wait for the motor to stop driving, and stops the inverter,
Said controller when the temperature of the predetermined portion has reached the first temperature value, based on the kinetic energy the motor has, it shall be determined the second temperature value,
A motor drive control device characterized by that. In the case of the acceleration operation or the constant speed operation of the motor, when the temperature of the predetermined portion exceeds the first temperature value, the controller
Stopping the inverter without setting the second temperature value;
The motor drive control device according to claim 1. At the same time as the stop post or stop of the inverter, a notification unit for notifying the status of the stop, that provides further
The motor drive control device according to claim 1 , wherein the motor drive control device is a motor drive control device. The temperature of the predetermined location is
Ru temperature der radiating fins and / or near the heat dissipating fins disposed on the inverter,
The motor drive control device according to claim 1, wherein the motor drive control device is a motor drive control device. The temperature of the predetermined location is
Ru temperature der elements and / or near said element is disposed within the inverter,
The motor drive control device according to any one of claims 1 to 3, characterized in that. The inverter is
Including multiple semiconductor switches,
The second temperature value is
Ru heat resistant temperature lower than der of the semiconductor switch,
The motor drive control device according to claim 4 or 5 , wherein The temperature of the predetermined location is
The temperature inside the motor ,
The motor drive control device according to claim 1. The motor is
Includes a magnet whose magnetic force decreases when the temperature exceeds a predetermined value,
The second temperature value is
Less than the predetermined value ,
Motor drive control device according to 請 Motomeko 7 you wherein a. A motor controller for controlling the operation of the inverter;
The controller is
That is arranged in the motor controller unit,
The motor drive control device according to claim 1. When the temperature at a predetermined location inside the drive control device exceeds the first temperature value during the deceleration operation of the motor, the controller
Compared to previous state exceeding the first temperature, so that the carrier frequency of the inverter is reduced, that controls the switching operation of the semiconductor switches constituting the inverter,
The motor drive control device according to claim 1 . A rotation axis (11; 111, 112);
An engine (6) connected to the rotating shaft and rotating the rotating shaft;
The motor is connected to the rotating shaft and functions as either an electric motor that converts electrical energy into mechanical energy to rotate the rotating shaft and a generator that converts mechanical energy that rotates the rotating shaft into electrical energy. A feasible rotating machine (7),
A driven part (9) driven by rotation of the rotating shaft;
A motor (10) connected to the rotating shaft and capable of rotating the rotating shaft;
A control unit (5) that causes the rotating machine to function as the electric motor, and that controls the rotating machine to rotate the rotating shaft and controls the motor to rotate the rotating shaft in parallel to start the engine. In a hybrid system comprising:
A charging unit (4) capable of charging a DC voltage;
An inverter (3) for converting a DC voltage from the charging unit to an AC voltage;
A controller in which the first temperature value is set, and
The motor is
Driven by the inverter;
When the temperature at a predetermined location inside the hybrid system exceeds the first temperature value, the controller
A second temperature value is determined according to the driving status of the motor, and after the driving of the motor is stopped, the inverter is stopped,
When the temperature at the predetermined location exceeds the second temperature value, the controller does not wait for the motor to stop driving, and stops the inverter,
The controller determines the second temperature value based on the kinetic energy of the motor when the temperature at the predetermined location reaches the first temperature value.
A hybrid system characterized by this . The controller is
That is disposed in said control portion,
The hybrid system of claim 1 1, wherein the. When the temperature at a predetermined location inside the drive control device exceeds the first temperature value during the deceleration operation of the motor, the controller
Controlling the switching operation of the semiconductor switch constituting the inverter so that the carrier frequency of the inverter is reduced as compared to the previous state of exceeding the first temperature;
The hybrid system according to claim 11 . A charging unit (4) capable of charging a DC voltage, an inverter (3) for converting the DC voltage from the charging unit to an AC voltage, a motor (10) driven by the inverter, and a first temperature value A drive control method of a motor drive control device comprising a controller in which is set,
(A) detecting that the temperature of a predetermined location inside the drive control device exceeds the first temperature value;
(B) determining the motion status of the motor when the first temperature value is reached;
(C) If it is determined as a result of the step (B) that the motor is decelerating, a second temperature value higher than the first temperature value is determined according to the driving status of the motor. Steps,
(D) stopping the inverter after driving of the motor is stopped;
(F) stopping the inverter without waiting for the motor to stop driving when the temperature at the predetermined location exceeds the second temperature value;
With
In the step (C), the controller determines the second temperature value based on the kinetic energy of the motor when the temperature of the predetermined location reaches the first temperature value.
A drive control method for a motor drive control device . (E) As a result of step (B), when it is determined that the motor is accelerating or operating at a constant speed, the step of stopping the inverter without setting the second temperature value; In addition,
The drive control method of the motor drive control device according to claim 14 . (G) after the stop of the inverter or simultaneously with the stop, further comprising a step of informing the stop state;
16. The drive control method for a motor drive control device according to claim 14, wherein the drive control method is used. (H) the step of (B) result, when the motor is determined to be in deceleration operation, compared with the previous state of greater than the first temperature, the carrier frequency of the inverter is reduced as such, the step that controls the switching operation of the semiconductor switches constituting the inverter, and further comprising,
Drive control method for a motor drive control apparatus according to claim 1 4, characterized in that.

Images