JP4412839B2 - Motor generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor generator that is a rotating electrical machine, and more particularly to a motor generator that can be used, for example, as a starter and an alternator of an internal combustion engine.
[0002]
[Prior art]
In a motor generator for a vehicle having an engine which is an internal combustion engine, first, a battery is connected as a DC power source to the motor generator, the motor generator operates as an electric motor, and the engine is started. That is, the motor generator operates as a starter.
[0003]
After the engine is started, the motor generator is operated as a generator to charge the battery and / or supply electricity to the electrical components. That is, the motor generator operates as an alternator.
[0004]
FIG. 6 shows a schematic configuration of the motor generator system 2 according to the prior art.
[0005]
The motor generator system 2 basically includes a motor generator 4 and a battery 8 connected to the motor generator 4 via a relay contact 6. The relay contact 6 is driven (open / close controlled) through a relay coil 12 connected in series to an ignition switch 10 having an automatic return contact that automatically returns by a spring.
[0006]
The motor generator 4 includes a stator 18 in which a coil 16 is Δ-wired between commutators 14, a brush 20 that contacts and supplies DC power when the motor generator 4 operates as a motor, and a permanent magnet for coil excitation. And a rotor 22 (not shown). The shaft of the rotor 22 is engaged with an engine crankshaft (not shown).
[0007]
The motor generator 4 induces a voltage generated in a commutation diode 24 and a motor coil (also simply referred to as a coil) 16 that prevent the occurrence of sparks between the brush 20 and the commutator 14 during operation as a motor. A power generation coil (also simply referred to as a coil) 26, two thyristors 27 each for rectifying a voltage generated in the power generation coil 26 and generating a rectified output voltage for charging the battery 8, and a diode 28. A single-phase full-wave rectifier bridge circuit 30 and a control circuit 29 that protects the battery 8 and the like by shutting off the gate of the thyristor 27 when an overvoltage for charging occurs.
[0008]
An overcurrent protection fuse 32 is inserted between the single-phase full-wave rectification bridge circuit 30 and the battery 8.
[0009]
In the motor generator system 2 configured as described above, when the engine is not operated, the relay contact 6 is closed while the ignition switch 10 is operated and closed by the user. DC power is supplied to the machine 4. Thereby, the motor generator 4 operates as an electric motor with the rotor 22 rotating.
[0010]
When the engine is ignited and started through a crankshaft engaged with the rotor 22 when operating as an electric motor, the user ends the operation of the ignition switch 10. As a result, the ignition switch 10 is opened and the relay contact 6 is opened.
[0011]
On the other hand, when the rotor 22 is rotated via the crankshaft in the engine operating state, the so-called governor mechanism separates the commutator 14 and the brush 20 between the cranking rotational speed and the idling rotational speed, and is in a non-contact state. To.
[0012]
When the rotor 22 having a permanent magnet is rotating, a voltage is induced in the coil 16, and an alternating voltage is induced in the power generation coil 26. The AC voltage induced in the power generation coil 26 is converted into a DC rectified output voltage by the single-phase full-wave rectification bridge circuit 30 and supplied to the battery 8 for charging and electrical components not shown.
[0013]
[Problems to be solved by the invention]
By the way, as described above, the motor generator 4 according to the prior art includes a motor portion composed of a motor coil 16 for a motor and a commutation diode 24 for preventing sparks, a power generation coil 26 and a single-phase all-electric generator. The generator part which consists of the wave rectification bridge circuit 30 is comprised, Since there are many components of the motor generator 4, there exists a subject that cost becomes high and apparatus itself enlarges.
[0014]
The present invention has been made in consideration of the above-described problems, and has an object to provide a motor generator that has a simple configuration, can be reduced in cost, and can reduce the size of the entire apparatus. And
[0015]
[Means for Solving the Problems]
This invention is a motor generator with a brush in which a coil is disposed between commutators on the stator side, a permanent magnet is disposed on the rotor side, and a brush that is in contact with the commutator is disposed.
Commutation means connected to the commutator and the coil and commutating the magnetic energy stored in the coil when the motor generator is operated as a motor by a DC power source at the time of starting;
After starting, when the motor generator operates as a generator, the commutation means is a connection used as a rectification means for AC voltage induced in the coil,
The coil and the commutation means are commonly used for the electric motor and the generator (the invention according to claim 1).
[0016]
According to the present invention, the coil (motor coil) and the commutation means at the time of the motor operation are shared as the power generation coil and the rectification means at the time of the generator operation, respectively, so that the configuration can be simplified and the cost can be reduced. Figured. In addition, the entire apparatus can be reduced in size.
[0017]
In this case, a voltage detection circuit for detecting the rectified output voltage of the AC voltage induced in the coil by the rectifier, and a trigger circuit in which the input side is connected to the output side of the voltage detection circuit and the output side is connected to the rectifier The overvoltage application to the DC power supply can be prevented (invention of claim 2). When the DC power source is a battery, it is possible to prevent overcharging caused by overvoltage to the battery.
[0018]
When the rectified output voltage detected by the voltage detection circuit has a value equal to or lower than a predetermined voltage, the trigger circuit sets the rectifying means in a conductive state, and the rectified output voltage exceeds the predetermined voltage. When the value is a value, the rectifying means can be configured to be in a cut-off state (the invention according to claim 3). For this reason, the battery voltage can be controlled at a constant voltage to the predetermined voltage by the voltage detection circuit and the trigger circuit.
[0019]
In addition, when the coil has a three-phase connection and the rectifying means has a three-phase bridge connection configuration between the coil and the DC power source, the DC power source having the three-phase bridge connection configuration The rectifier connected to the terminal side is a thyristor, and the rectifier connected to the negative terminal of the DC power supply is a diode or thyristor. The voltage control action can be achieved (the invention according to claim 4).
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the drawings to be referred to below, the same reference numerals are given to those corresponding to those shown in FIG.
[0021]
FIG. 1 shows a schematic configuration of a motor generator system 50 to which an embodiment of the present invention is applied. This motor generator system 50 is incorporated into a two-wheeled vehicle such as a scooter having an engine which is an internal combustion engine, or a four-wheeled passenger car for use.
[0022]
FIG. 2 shows a configuration of the motor generator system 50 including a detailed electric circuit configuration of the control circuit 52 shown in FIG. The control circuit 52 includes a voltage detection circuit 100, a comparison circuit 102, and a trigger circuit 104, which will be described in detail later.
[0023]
The motor generator system 50 shown in FIGS. 1 and 2 basically includes a motor generator 54 and a battery 8 that is a DC power source connected to the motor generator 54 via a relay contact 6. ing. The nominal voltage value of the voltage between the terminals of the battery 8 is 12 [V]. The value of the voltage between the terminals when the battery 8 is fully charged is set to 14.5 [V].
[0024]
The relay contact 6 is driven (open / close controlled) through a relay coil 12 connected in series to an ignition switch 10 having an automatic return contact that automatically returns by a spring. In practice, the ignition switch 10 includes an ignition switch 10 having an automatic return contact and an accessory switch 11 that supplies power to electrical components such as a radio and a lamp. In addition, in a four-wheeled passenger car or the like, the ignition switch 10 can be turned on / off only when the accessory switch 11 is closed due to its structure.
[0025]
The motor generator 54 includes a stator 18 in which the coil 16 is three-phase Δ wired between the commutators 14, and the brush 20 that contacts and supplies DC power when the motor generator 54 operates as a motor, and coil excitation. And a rotor 22 on which permanent magnets (not shown) are arranged. The shaft of the rotor 22 is engaged with an engine crankshaft (not shown).
[0026]
Furthermore, the motor generator 54 functions as a spark prevention diode that prevents the occurrence of sparks between the brush 20 and the commutator 14 when driven as an electric motor, and induces the coil 16 during operation as a generator. A commutation means 110 having a three-phase bridge connection configuration that functions as a rectification means for rectifying an AC voltage to generate a rectified output voltage for charging the battery 8, and a battery 8 connected to the commutation means 110 when charging the battery 8 And a control circuit 52 for monitoring and protecting the overvoltage.
[0027]
Here, the commutation means 110 has a common configuration that functions as a spark prevention commutation means when the motor generator 54 operates as an electric motor, and functions as a rectification means when operated as a generator.
[0028]
The commutation means 110 is configured such that a circuit in which a thyristor 112 and a diode 114 are connected in series in the forward direction is connected in parallel with three circuits, and the common connection point on the anode side of the diode 114 is the negative electrode of the battery 8. If connected to ground. The common connection point on the cathode side of the thyristor 112 is connected to the control circuit 52 and to the positive electrode of the battery 8 through the overcurrent protection fuse 32 and the accessory switch 11. The connection point between the anode of each thyristor 112 and the diode 114 is connected to the commutator 14. The gate of the thyristor 112 is connected to the control circuit 52. Here, the diode 114 can be replaced with a thyristor.
[0029]
As shown in FIG. 2, when the commutation means 110 is operating as a rectification means, the control circuit 52 generates a voltage such as a three-phase full-wave rectification output of the alternating voltage induced in the coil 16 by the commutation means 110. A voltage detection circuit 100 that detects the value of Va, and a trigger circuit 104 that controls conduction and non-conduction (cutoff) of the commutation means 110 operating as a rectification means based on the output of the voltage detection circuit 100 are provided. .
[0030]
The voltage detection circuit 100 is a voltage dividing circuit including a variable resistor 122, a constant voltage diode 124, and a resistor 126, and outputs the value of the divided voltage Vb of the rectified output voltage Va to the trigger circuit 104. Here, the voltage dividing ratio can be changed by adjusting the variable resistor 122. In other words, by adjusting the variable resistor 122, it is possible to set the divided voltage Vb that absorbs variations in the type of the battery 8 and the entire circuit.
[0031]
Further, the voltage detection circuit 100 detects not only the voltage Va as the three-phase full-wave rectified output voltage but also the voltage between the terminals of the battery 8. Directly, the voltage between the terminals of the battery 8 is detected as the voltage Va (divided voltage Vb).
[0032]
The divided voltage Vb is connected to the base of the NPN transistor 128 constituting the trigger circuit 104, and when the voltage Va (divided voltage Vb) is not equal to or higher than a predetermined overvoltage, the transistor 128 Designed in the off state.
[0033]
In the following description, a state where the rectified output voltage Va is not overvoltage is referred to as a normal state, and a state where the rectified output voltage Va is overvoltage is referred to as an overvoltage state.
[0034]
The control circuit 52 is designed so that the transistor 128 is turned from the off state to the on state when the divided voltage Vb proportional to the voltage Va satisfies Vb> Vbe (base emitter forward voltage of the transistor 128). Yes.
[0035]
A constant voltage diode 160 is connected between the collector and emitter of the transistor 128, and a resistor 130, a diode 162, and a resistor 132 are sequentially connected in series to the cathode of the constant voltage diode 160. When the constant voltage value of the constant voltage diode 160 is set to 16 to 20 [V] and the generated voltage exceeds this voltage value, the PNP transistor 168 is turned off as will be described later, and as a result, the battery 8 To protect against overvoltage.
[0036]
The resistor 132 is connected to the cathode common connection point of the three diodes 150, 152, and 154 and one end of the resistors 134 and 136.
[0037]
The anodes of the three diodes 150, 152, and 154 are respectively connected to a common connection point between each set of thyristor 112 and diode 114.
[0038]
The other end of the resistor 134 is connected to the anode of a diode 164, and the cathode of the diode 164 is connected to the base of a PNP transistor 168 that is on in the normal state.
[0039]
The other end of resistor 136 is connected to the emitter of transistor 168.
[0040]
The base of the PNP transistor 166, which is normally off, is connected between the resistor 130 and the cathode of the diode 162. The collector of the PNP transistor 166 is grounded through the resistor 172 and the base of the transistor 168. And connected to the cathode of the diode 164.
[0041]
The collector of the transistor 168 is connected to the anode of the diode 170, and the cathode of the diode 170 is connected to the rectified output voltage Va through the voltage divider circuits of the resistors 140a and 142a, the resistors 140b and 142b, and the resistors 140c and 142c. Connected to the detection point. The voltage dividing points of the voltage dividing circuits of the resistors 140a and 142a, the resistors 140b and 142b, and the resistors 140c and 142c are connected to the gate of the thyristor 112, respectively.
[0042]
Here, the voltage appearing at the collector of the transistor 128 is the voltage Vc, the voltage appearing at the base of the transistor 166 is the voltage Vd, the voltage appearing at the cathode common connection point of the diodes 150, 152, 154 is Ve, and the voltage appearing at the base of the transistor 168 is. This is referred to as voltage Vf.
[0043]
The motor generator system 50 according to this embodiment is configured as described above. Next, the operation will be described in more detail.
[0044]
When the engine (not shown) is not operating, both the accessory switch 11 and the ignition switch 10 are in an open state (off state). When the ignition switch 10 is open, the relay contact 6 is also open.
[0045]
When a user such as a driver tries to start the engine, first, the accessory switch 11 is operated from the open state to the closed state. At this time, the voltage Va is not a rectified output voltage but a voltage value between terminals of the battery 8 having a voltage value lower than the rectified output voltage value. In this state, the divided voltage Vb of the voltage detection circuit 100 is designed to be lower than the base-emitter forward voltage Vbe (Vb <Vbe), which is the reference voltage of the transistor 128 of the comparison circuit 102. The transistor 128 is turned off.
[0046]
Further, since the rotor 22 is not rotating, no induced voltage is generated in the coil 16. For this reason, the diodes 150, 152, and 154 are turned off, and the diode 170 is turned off, so that the thyristor 112 is also turned off. Eventually, all the diodes except the constant voltage diode 124 to which current is supplied from the battery 8 are placed. The active element is off.
[0047]
Next, in a state where the accessory switch 11 is closed, the ignition switch 10 is operated by the user. As described above, the ignition switch 10 is a self-returning switch, and is closed against the compression force of a spring (not shown) only in a state where the operating hand is not released.
[0048]
When the ignition switch 10 is closed, an exciting current flows from the battery 8 to the relay coil 12 through the ignition switch 10, and the relay contact 6 is closed.
[0049]
As a result, the DC power of the battery 8 is supplied between the brushes 20 of the motor generator 54 through the relay contact 6, and the motor generator 54 operates as an electric motor as the rotor 22 rotates. When operating as an electric motor, the crankshaft of the engine engaged with the rotor 22 starts rotating and cranking is performed. Due to the rotation of the crankshaft by cranking, the piston of the engine starts to reciprocate, the operation as the internal combustion engine starts, and the engine starts.
[0050]
When the rotor 22 rotates and the motor generator 54 operates as an electric motor, the brush 20 attached to the rotor 22 and the commutator 14 of the stator 18 are intermittently connected.
[0051]
At this time, a three-phase AC voltage is generated in the coil 16, and the diodes 150, 152, and 154 are sequentially turned on by the generated AC voltage, and the voltage Ve at the common cathode point of the diodes 150, 152, and 154 is always The peak voltage is approximately set.
[0052]
At this time, the diode 164 is always turned on through the resistor 134, and the transistor 168 is turned on. Thereby, the diode 170 is turned on, the gate of the thyristor 112 is set to the high level, and the thyristor 112 is made conductive.
[0053]
In practice, when the motor generator 54 is operated as a motor, the thyristor 112 is immediately brought into conduction by the induced voltage generated in the coil 16 (the diode 114 is in the off state), and the voltage Va is the rectified output voltage. It is said.
[0054]
When the brush 20 moves to the adjacent commutator 14, so-called commutation, it is connected from the positive-side brush 20 (upper brush in FIGS. 1 and 2) to the coil 16 generating back electromotive force. Although a spark current is about to flow to the commutator 14 and a spark is about to occur, the thyristor 112 is in a conductive state, and as an example, as shown by an arrow path A in FIG. A current (current to generate a spark) flows from the coil 16 about to flow through the path of the commutator 14, the thyristor 112, the fuse 32, the accessory switch 11, the relay contact 6, and the brush 20 on the positive electrode side.
[0055]
In this case, since the voltage between the brush 20 on the positive electrode side and the commutator 14 is maintained at about 0.5 [V], which is the inter-terminal voltage when the thyristor 112 is conducted, the positive electrode side is actually used during commutation. No spark is generated between the brush 20 and the commutator 14.
[0056]
At the same time, a spark based on the counter electromotive force of the coil 16 is generated between the negative electrode brush 20 and the commutator 14 that are grounded. However, as shown by an arrow path B in FIG. A current (current to generate a spark) flows from the coil 16 in the path of the commutator 14, the negative brush 20, the diode 114, and the commutator 14.
[0057]
Also in this case, the voltage between the brush 20 on the negative electrode side and the commutator 14 is maintained at about 0.5 [V], which is the forward voltage of the diode 114. No spark is generated between the brush 20 and the commutator 14.
[0058]
When the rotor 22 starts rotating and the engine is started and reaches a predetermined rotational speed, the connection between the brush 20 and the commutator 14 of the rotor 22 is described later using a centrifugal force related to the rotation of the rotor 22. It is opened by the mechanism. Thereafter, the brush 20 and the commutator 14 are not connected, the rotor 22 is rotated by the engine, and the motor generator 54 operates as a generator.
[0059]
When the motor generator 54 is operating as a generator, such as when a four-wheel passenger car is running, in other words, when the engine is operating and the rotor 22 having permanent magnets is rotating, a voltage is induced in the coil 16. To do. The AC voltage induced in the coil 16 is converted to a voltage Va as a DC rectified output by the commutation means 110 that is a three-phase full-wave rectifier bridge circuit, and is supplied to the battery 8 for charging and electrical components not shown. Is done.
[0060]
At the time of charging, the voltage detection circuit 100 constantly detects the divided voltage Vb of the voltage Va as the rectified output value.
[0061]
In this embodiment, when the voltage Va becomes Va = + 14.5 [V], which is an overvoltage of the battery 8, the divided voltage Vb becomes the base-emitter forward voltage Vbe of the transistor 128 = 0.7 [V]. It is designed to have a value exceeding (Vb> Vbe).
[0062]
When the divided voltage Vb satisfies Vb> Vbe, the transistor 128 changes from the off state to the on state (saturated state). At this time, current flows through the resistor 132 and the diode 162, the transistor 166 is turned on from the off state, and no current flows through the resistor 134 and the diode 164, so that the transistor 168 and the diode 170 are turned off. .
[0063]
Thereby, the gate voltage of the thyristor 112 is set to the voltage Va, and the battery 8 is disconnected from the thyristor 112 constituting the generator by turning off the thyristor 112. The value of the voltage Va becomes the voltage value of the battery 8.
[0064]
The trigger circuit 104 controls on / off of the thyristor 112 through the voltage detection circuit 100 in response to the fluctuation of the battery voltage Va, so that the terminal voltage of the battery Va is controlled to a predetermined constant voltage.
[0065]
Note that when the generated voltage rises to, for example, 16 [V] or more, the constant voltage diode 160 enters a constant voltage state. In this case as well, the transistor 166 is turned on, so that the transistor 168 is turned off. As a result, the thyristor 112 is turned off.
[0066]
For this reason, the battery 8 is protected without applying an overvoltage to the battery 8. That is, the supply (application) of overvoltage to the battery 8 is prevented in advance.
[0067]
4 and 5 are schematic views showing a partially omitted cross section of the mechanical configuration of the motor generator 54 that is configured and operates as described above, and FIG. 4 shows a state as an electric motor. Indicates a state as a generator. 4 and 5, the same reference numerals are given to the components corresponding to those shown in FIGS. 6 and 1 to 3 described above, and detailed description thereof will be omitted.
[0068]
As shown in FIGS. 4 and 5, the motor generator 54 basically includes a stator 18 in which the coil 16 is disposed between the commutators 14 and a permanent magnet 204 for exciting the coil 16. And a rotor 22 provided with a brush 20 that contacts the commutator 14 during operation as an electric motor. For convenience of understanding, only two coils 16 are drawn, but there are actually three coils 16 (see FIG. 1 or FIG. 2). The brush 20 is connected to the slip ring 15 in the rotor 22, and when starting (when operating as an electric motor), the voltage from the battery 8 is supplied via the terminals 226 and 227 and the slip rings 15 and 15. It is supplied to the brush 20.
[0069]
The rotor 22 includes a first rotating portion 22a that rotates simultaneously and a second rotating portion 22b that engages with the first rotating portion 22a. The second rotating portion 22b can move relative to the first rotating portion 22a in the direction of arrow P (when operating as a generator) or the direction of arrow Q (when operating as an electric motor or when stopped) via a slide mechanism 208. It is configured.
[0070]
The slide mechanism 208 of the second rotating portion 22b includes a spring 210, a connecting pin 214, a disk 212, and a weight roller 206, and constitutes a so-called governor mechanism.
[0071]
An engine crankshaft 202 (not shown) and a permanent magnet 204 are fixed to the first rotating portion 22a. The brush 20 and the slip ring 15 are embedded in the second rotating portion 22b.
[0072]
On the other hand, the stator 18 has a mold member 80, and a holding member for the core 222 and the commutator 14 is fixed to the mold member 80. As described above, the coil 16 is wound around the core 222.
[0073]
The positive terminal of the battery 8 is connected to the control circuit 52 shown in FIG. 1 and the electric circuit 224 including the three-phase full-wave rectifier bridge circuit via the accessory switch 11 and the fuse 32, and the terminal is connected through the relay contact 6. 226. The negative terminal of the battery 8 is connected to the electric circuit 224 and the terminal 227.
[0074]
Between the positive terminal and the negative terminal of the battery 8, a series circuit of an ignition switch 10 and a relay coil 12 is connected.
[0075]
As shown in FIG. 4, when the weight roller 206 is on the axial center side when the engine is stopped or started, the slide mechanism 208 causes the second rotating portion 22 b to move toward the end in the arrow Q direction by the compression force of the spring 210. The commutator 14 and the terminals 226 and 227 are electrically connected to the brush 20. In this state, when power is supplied from the battery 8, the motor generator 54 operates as an electric motor, the rotor 22 rotates in the direction of the arrow, is cranked via the crankshaft 202, and the engine is started.
[0076]
Further, when the rotor 22 rotates, the weight roller 206 moves in the arrow direction shown in FIG. 5 by centrifugal force, so that the second rotating portion 22b compresses the spring 210 via the connecting pin 204 of the slide mechanism 208. Slide in the direction of arrow P with a force stronger than the force. As a result, the connection between the brush 20 and the commutator 14 and the slip ring 15 and the terminals 226 and 227 is separated, and thereafter, the motor generator 54 operates as a generator and charging of the battery 8 is started.
[0077]
As described above, according to this embodiment, the coil 16 is disposed between the commutators 14 on the stator 18 side, the permanent magnet 204 for exciting the coil is disposed on the rotor 22 side, and the commutator. In the motor generator 54 with a brush in which the brush 20 in contact with the motor 14 is arranged, when the motor generator 54 operates as a motor by the battery 8 which is a DC power source at the time of starting, it is connected to the commutator 14 and the coil 16. A thyristor 112 and a diode 114 as commutation means 110 for preventing sparks commutating the magnetic energy accumulated in the coil 16 are provided, and the motor generator 54 serves as a generator for charging at least the battery 8 after starting. In operation, the commutation means 110 is a connection used as a rectification means for the alternating voltage induced in the coil 16, As use, it is configured to share the coil 16 and the commutation means 110.
[0078]
For this reason, unlike the motor generator system 2 according to the prior art described with reference to FIG. 6, a single power generation coil 26 is not required, and the spark prevention circuit and the rectifier circuit can be shared. The number of power diodes 24 and 28 can be reduced, and the configuration of the motor generator 54 can be simplified. Therefore, the cost can be reduced. In addition, the entire apparatus can be reduced in size. Note that the control circuit 52 is a relatively low power consumption circuit, and can be easily configured with a single integrated circuit.
[0079]
In this case, the voltage detection circuit 100 for detecting the rectified output voltage Va by the commutation means 110 functioning as the rectification means for the alternating voltage induced in the coil 16, and the input side are connected to the output side of the voltage detection circuit 100, and the output By providing the trigger circuit 104 whose side is connected to the commutation means 110, it is possible to prevent application of overvoltage to the battery 8.
[0080]
Then, when the rectified output voltage Va detected by the voltage detection circuit 100 is a value equal to or lower than a predetermined voltage (here, 14.5 [V] as described above), the trigger circuit 104 performs commutation means. When the rectified output voltage Va is a value exceeding a predetermined voltage, the commutation means 110 is configured to be cut off, so that the voltage detection circuit 100 and the trigger circuit 104 Thus, the battery voltage Va can be controlled at a constant voltage to a predetermined voltage.
[0081]
In this embodiment, when the coil 16 has a three-phase connection and the commutation means 110 has a three-phase bridge connection configuration between the coil 16 and the battery 8, a three-phase bridge connection configuration is used. The rectifying means connected to the positive terminal side of the battery 8 is the thyristor 112, and the rectifying means connected to the negative terminal side of the battery 8 is the diode 114 or thyristor. Control action and overvoltage protection are achieved.
[0082]
The present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.
[0083]
【The invention's effect】
As described above, according to the present invention, the coil (motor coil) and the commutation means during operation of the electric motor are shared as the power generation coil and rectification means during operation of the generator, respectively. The cost can be reduced. In addition, the entire apparatus can be reduced in size. Further, high reliability based on the reduction in the number of parts can be realized at the same time.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a motor generator system to which an embodiment of the present invention is applied.
FIG. 2 is a detailed circuit diagram of the motor generator system of FIG. 1 illustrating the configuration of a control circuit in detail.
FIG. 3 is an explanatory diagram of commutation means for preventing sparks.
FIG. 4 is a schematic diagram showing a partially omitted vertical section of a mechanical configuration when the motor generator to which the embodiment of the present invention is applied operates as a motor (starting).
FIG. 5 is a schematic diagram showing a partially omitted vertical section of a mechanical configuration when the motor generator to which the embodiment of the present invention is applied operates as a generator (during charging).
FIG. 6 is a configuration diagram of a motor generator system according to the prior art.
[Explanation of symbols]
6 ... Relay contact 8 ... Battery
10 ... Ignition switch 11 ... Accessory switch
12 ... Relay coil 14 ... Commutator
16 ... Coil 18 ... Stator
20 ... Brush 22 ... Rotor
22a ... 1st rotation part 22b ... 2nd rotation part
50 ... Motor generator system 52 ... Control circuit
54 ... Motor generator 100 ... Voltage detection circuit
102: Comparison circuit 104: Trigger circuit
110: Commutation means 112 ... Thyristor
114 ... Diode 122 ... Variable resistor
202 ... Crankshaft 204 ... Permanent magnet
206 ... Weight roller 208 ... Slide mechanism
210 ... spring 224 ... electric circuit
226, 227 ... terminals

Claims (4)

On the stator side, a coil is disposed between the commutators, a permanent magnet is disposed on the rotor side, and a brushed motor generator in which a brush that contacts the commutator is disposed,
Commutation means connected to the commutator and the coil and commutating the magnetic energy stored in the coil when the motor generator is operated as a motor by a DC power source at the time of starting;
After starting, when the motor generator operates as a generator, the commutation means is a connection used as a rectification means for AC voltage induced in the coil,
The motor generator, wherein the coil and the commutation means are shared for the motor and the generator. The motor generator according to claim 1,
A voltage detection circuit for detecting a rectified output voltage by the rectifier of the alternating voltage induced in the coil;
A motor generator comprising: a trigger circuit having an input side connected to an output side of the voltage detection circuit and an output side connected to the rectifying means. The motor generator according to claim 2,
The trigger circuit is
When the rectified output voltage detected by the voltage detection circuit is a value equal to or less than a predetermined voltage, the rectified output voltage is applied to the DC power source in a state where the rectifying means can be conducted,
When the rectified output voltage is a value exceeding the predetermined voltage, the rectifier is turned off. The motor generator according to any one of claims 1 to 3,
When the coil is a three-phase connection, and the rectifying means has a three-phase bridge connection configuration between the coil and the DC power supply,
The rectifier connected to the + terminal side of the DC power supply having the three-phase bridge connection configuration is a thyristor, and the rectifier connected to the − terminal side of the DC power supply is a diode or thyristor. A motor generator characterized by

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