JP5707638B2 - Three-phase brushless motor drive control device - Google Patents

Description

  The present invention relates to a drive control device for a three-phase brushless motor.

A drive control device that drives and controls a three-phase brushless motor has a rotor composed of permanent magnets, a motor coil, and three hall elements for detecting the position of the rotor. The motor coil is energized based on the rotational position, and the rotor is rotated by a rotating magnetic field generated thereby.
When driving and controlling a three-phase brushless motor, the speed of the motor is controlled by changing the duty ratio of the driving pulse driven by PWM control (see Patent Document 1).

JP-A-11-136993

In the drive control device for the three-phase brushless motor described above, when the rotor rotational position is detected by the Hall sensor and the energization control is performed, the phase counting function of the microcomputer as the host controller cannot be used as it is. That is, the phase counting mode assumes an encoder output signal that generates a two-phase pulse, and the phase counting function cannot be used in the host controller with the three-phase sensor signal output from the hall sensor. It is not possible to measure conditions such as the number of rotations or the direction of rotation.
Also, providing an encoder in the motor instead of the Hall sensor is expensive and increases the size of the motor.

  The present invention has been made to solve these problems, and an object of the present invention is to control the drive of a three-phase brushless motor that can perform motor drive control using the phase counting function of the host controller with a simple configuration. To provide an apparatus.

In order to achieve the above object, the present invention comprises the following arrangement.
Drive control of a three-phase brushless motor that outputs a drive signal from a motor driver circuit to a three-phase brassless motor by outputting a hall sensor signal for three phases that detects the rotor position due to the magnetic pole change of the permanent magnet rotor to the host controller. The motor driver circuit is a sensor signal conversion circuit that outputs a conversion signal generated by converting a hall sensor signal for three phases into a signal in an encoder output format for two phases to the host controller; A motor drive circuit that drives the three-phase brushless motor based on a motor rotation direction and rotation speed command output from a host controller, and the sensor signal conversion circuit is configured to output a hall sensor signal for three phases. The rising edge of the first pulse input in series is set to the rising edge of the first encoder output signal. The second rising edge of the Hall sensor signal is converted to the falling edge of the first encoder output signal, and the first falling edge of the Hall sensor signal is converted to the rising edge of the second encoder output signal. Then, by converting the second pulse falling edge of the Hall sensor signal to the falling edge of the second encoder output signal and repeating the process, a conversion signal of the encoder output format for two phases is generated to generate the conversion signal Output to the host controller, and the host controller measures the motor rotation speed, rotation direction, and rotation speed based on the conversion signal in the encoder output format for the two phases and outputs the necessary control command to the motor drive circuit characterized in that it.
According to the above configuration, the sensor signal conversion circuit outputs the converted signal generated by converting the hall sensor signal for three phases into the signal of the encoder output format for two phases to the host controller. The function can be used to measure the rotation speed, rotation direction, and rotation speed from the output signals for the two phases of the sensor signal conversion circuit, and to output necessary control commands to the motor drive circuit .
Therefore, the drive control of the motor can be realized at low cost by utilizing the functions of the existing control device.

Also, driving a three-phase brushless motor that outputs a drive signal from a motor driver circuit to a three-phase brassless motor by outputting a three-phase Hall sensor signal for detecting the rotor position due to the magnetic pole change of the permanent magnet rotor to the host controller. A control device, wherein the motor driver circuit converts a hall sensor signal for three phases into a signal in an encoder output format for two phases, and outputs a conversion signal generated to the host controller; A motor drive circuit that drives the three-phase brushless motor based on a rotation direction and rotation speed command of the motor output from the host controller, and the sensor signal conversion circuit has a hall sensor signal for three phases. The rising edge of the second encoder output signal is the first pulse rising edge input in time series. The second pulse rising edge of the Hall sensor signal is converted into a falling edge of the second encoder output signal, and the first pulse falling edge of the Hall sensor signal is converted to the rising edge of the first encoder output signal. converted to, by repeating the process for distributing by converting the second pulse falling edge of the Hall sensor signal to the falling edge of the first encoder output signal to generate a converted signal of the encoder output format of two phases To the host controller, and the host controller measures the rotation speed, rotation direction, and rotation speed of the motor based on the conversion signal in the encoder output format for the two phases, and controls the motor drive circuit. Is output.
Even with the above configuration, the sensor signal conversion circuit outputs the conversion signal generated by converting the hall sensor signal for three phases into the signal of the encoder output format for two phases to the host controller. Can be used to measure the rotational speed, rotational direction, and rotational speed from the output signals for the two phases of the sensor signal conversion circuit, and to output necessary control commands to the motor drive circuit.

  By using the above-described three-phase brushless motor drive control device, it is possible to provide a three-phase brushless motor drive control device that can perform motor drive control using the phase counting function of the host controller with a simple configuration.

It is a block block diagram of the drive control apparatus of a three-phase brushless motor. It is a timing chart figure which shows the production | generation process of the conversion signal produced | generated in a sensor signal conversion circuit.

  Embodiments of a drive control device for a three-phase brushless motor according to the present invention will be described below with reference to the accompanying drawings. In the present embodiment, a block configuration of a drive control device for a three-phase DC brushless motor is illustrated.

With reference to the block diagram of FIG. 1, a schematic configuration of a drive control device for a three-phase DC brushless motor will be described.
The three-phase DC brushless motor 1 includes a permanent magnet rotor having a permanent magnet provided on a rotor yoke, a stator having a motor coil wound around pole teeth of a stator core, and hall sensors (HU, HV, HW). A three-phase (U-phase, V-phase, W-phase) motor coil is wound around the pole teeth of a stator core arranged to face the magnetic poles of a permanent magnet rotor (not shown). A motor current flows through each phase motor coil at a predetermined timing by a motor drive circuit described later.

Hall sensor signals for three phases for detecting the rotor position are output to the motor driver circuit 2. The motor driver circuit 2 outputs a drive signal to the three-phase brushless motor 1.
The motor driver circuit 2 includes a hall signal encoder signal output conversion circuit 3 (sensor signal conversion circuit) and a motor drive circuit 4. The hall signal encoder signal output conversion circuit 3 outputs a conversion signal generated by converting the sensor signal for three phases into a signal in the encoder output format for two phases to the host controller 5. The host controller 5 controls driving of the three-phase brushless motor 1 by a control circuit including various control elements such as a CPU, a ROM, and a RAM.

The motor drive circuit 4 controls energization of the motor coils (U phase, V phase, W phase) of the three-phase brushless motor 1 based on the motor rotation direction and rotation speed commands output from the host controller 5.
Specifically, the host controller 5 outputs a rotation start and rotation stop command signal, a rotation direction command signal, and a speed command signal of the three-phase DC brushless motor 1 to the motor drive circuit 4. The motor drive circuit 4 controls the motor drive by energizing each phase motor coil of the three-phase DC brushless motor 1 in response to a command from the host controller 5.

According to the above configuration, the hall signal encoder signal output conversion circuit 3 outputs the conversion signal generated by converting the sensor signal for three phases into the signal in the encoder output format for two phases to the upper controller 5. Using the phase counting function of the controller 5, the number of rotations and the direction of rotation of the motor can be detected from the two-phase output signals of the hall signal encoder signal output conversion circuit 3, and a control signal can be output to the motor drive circuit 4.
Therefore, the drive control of the motor can be realized at low cost by utilizing the functions of the existing control device.

  FIG. 2 illustrates an example of a conversion signal generation operation by the hall signal encoder signal output conversion circuit 3. As shown in FIG. 1, hall signal signals for three phases (HU, HV, HW) are input to the hall signal encoder signal output conversion circuit 3 in time series.

  In FIG. 2, if the rotation direction of the three-phase brushless motor 1 is the clockwise direction (CW direction), the rising edge of the pulse sent from the Hall sensor signal is used to generate the first encoder output signal A. The falling edge is used to generate the second encoder output signal B. In the counterclockwise direction (CCW), on the contrary, the rising edge of the pulse is used to generate the second encoder output signal B, and the falling edge of the pulse is used to generate the first encoder output signal A. Used for. Whether the motor is rotating in the CW direction or the CCW direction is determined by a sensor signal conversion circuit (not shown) in the motor driver circuit 2.

  Specifically, when rotating in the CW direction, the first pulse rising edge E1 of the HV phase Hall sensor signal among the three phase Hall sensor signals is converted into the rising edge of the first encoder output signal A. Then, the second pulse rising edge E2 of the HW-phase Hall sensor signal is converted into the falling edge of the first encoder output signal A, respectively.

  Also, the first pulse falling edge E3 of the HU-phase Hall sensor signal is converted to the rising edge of the second encoder output signal B, and the second pulse falling edge E4 of the HV-phase Hall sensor signal is converted to the second. The process of converting and distributing to the falling edge of the encoder output signal B is repeated.

  When rotating in the CCW direction, the first pulse rising edge E5 of the HW phase Hall sensor signal among the three phase Hall sensor signals is converted into the rising edge of the second encoder output signal B, and the HV The second pulse rising edge E6 of the phase Hall sensor signal is converted into the falling edge of the second encoder output signal B, respectively.

  Further, the first pulse falling edge E7 of the HU-phase Hall sensor signal is converted into the rising edge of the first encoder output signal A, and the second pulse falling edge E8 of the HW-phase Hall sensor signal is converted into the first pulse. The process of converting and distributing to the falling edge of the encoder output signal A is repeated.

  Thereby, the conversion signals A and B in the encoder output format for two phases can be generated from the signals of the hall sensors for three phases.

  In the above example, the rising edge of the pulse in the CW direction is used to generate the first encoder output signal A, the falling edge of the pulse is used to generate the second encoder output signal B, and in the CCW direction, The rising edge of the pulse is used to generate the second encoder output signal B, and the falling edge of the pulse is used to generate the first encoder output signal A. On the contrary, the pulse is generated in the CW direction. Is used to generate the second encoder output signal B, the falling edge of the pulse is used to generate the first encoder output signal A, and the rising edge of the pulse is the first encoder output signal in the CCW direction. A may be used to generate A and the falling edge of the pulse may be used to generate the second encoder output signal B.

  With the conversion signals A and B in the encoder output format for two phases, the host controller 5 can measure the rotational speed, rotational direction, and rotational speed of the motor and output a necessary control command to the motor drive circuit 4. .

  For example, when a rising edge occurs in the encoder output signal B when the output level of the encoder output signal A is H, it is determined that the encoder output signal B is rotating clockwise (CW direction), and the output of the encoder output signal A is output. If a falling edge occurs in the encoder output signal B when the level is H, it is determined that the encoder output signal B is rotating in the counterclockwise direction (CCW). The host controller 5 can measure the rotation speed by counting the number of pulses of the encoder output signals A and B.

  In the present embodiment, the three-phase DC brushless motor has been described. However, the three-phase DC brushless motor may be an inner rotor type DC brushless motor or an outer rotor type DC brushless motor.

1 3-phase DC brushless motor 2 Motor driver circuit 3 Hall signal encoder signal output conversion circuit 4 Motor drive circuit 5 Host controller

Claims (2)

Drive control of a three-phase brushless motor that outputs a drive signal from a motor driver circuit to a three-phase brassless motor by outputting a hall sensor signal for three phases that detects the rotor position due to the magnetic pole change of the permanent magnet rotor to the host controller. A device,
The motor driver circuit converts a Hall sensor signal for three phases into a signal in an encoder output format for two phases, and outputs a conversion signal generated to the host controller;
A motor drive circuit that drives the three-phase brushless motor based on a rotation direction and rotation speed command of the motor output from the host controller,
The sensor signal conversion circuit uses a first pulse rising edge to input a hall sensor signal for three phases in time series as a rising edge of the first encoder output signal, and a second pulse rising edge of the hall sensor signal. Is converted to the falling edge of the first encoder output signal, the first pulse falling edge of the Hall sensor signal is converted to the rising edge of the second encoder output signal, and the second pulse falling edge of the Hall sensor signal is converted. By repeating the process of converting the edge into the falling edge of the second encoder output signal and distributing it, a converted signal in the encoder output format for two phases is generated and output to the host controller. Based on the conversion signal of the encoder output format for two phases, the motor rotation speed, rotation direction, rotation speed The measured driving control apparatus for a three-phase brushless motor and outputs a control command required for the motor drive circuit. Drive control device for a three-phase brushless motor that outputs a drive signal from a motor driver circuit to a three-phase brassless motor by outputting a three-phase Hall sensor signal for detecting the rotor position due to the magnetic pole change of the permanent magnet rotor to the host controller Because
The motor driver circuit converts a Hall sensor signal for three phases into a signal in an encoder output format for two phases, and outputs a conversion signal generated to the host controller;
A motor drive circuit that drives the three-phase brushless motor based on a rotation direction and rotation speed command of the motor output from the host controller,
The sensor signal conversion circuit uses a first pulse rising edge to which a Hall sensor signal for three phases is input in time series as a rising edge of a second encoder output signal, and a second pulse rising edge of the Hall sensor signal. Is converted to the falling edge of the second encoder output signal, the first pulse falling edge of the Hall sensor signal is converted to the rising edge of the first encoder output signal, and the second pulse falling edge of the Hall sensor signal is converted. By repeating the process of converting the edge into the falling edge of the first encoder output signal and distributing it, a conversion signal in the encoder output format for two phases is generated and output to the host controller, Based on the conversion signal of the encoder output format for two phases, the motor rotation speed, rotation direction, rotation speed The measured driving control apparatus for a three-phase brushless motor to output a control command required for the motor drive circuit.

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