JP2010119253A5 - - Google Patents

Claims (11)

DC power supply,
A smoothing capacitor connected between the positive and negative sides of the DC power supply ;
An inverter bridge circuit including an inverter bridge that converts DC power from the DC power source into AC power and supplies the motor to the motor ;
A control circuit for outputting a PWM control signal to the inverter bridge circuit;
A plurality of diodes individually connecting anode terminals to the output ends of the inverter bridge;
Commonly connecting the cathode terminals of the plurality of diodes, and a common resistor connecting the common terminal and one end thereof,
A semiconductor switch for connecting the other end of the common resistor and one end thereof, and connecting a negative side of the DC power source and the other end;
A motor control device comprising: another diode for connecting one end of the semiconductor switch and an anode terminal, and for connecting a positive side of the DC power source and a cathode terminal . The control circuit causes the inverter bridge or the semiconductor switch to perform an on / off operation so that the common resistor serves as both a regenerative resistor that processes regenerative power from the motor and a brake resistor that processes braking power from the motor. The motor control device according to claim 1. When the control circuit is a dynamic brake, all the inverter bridges are turned off, and the semiconductor switch is turned on.
3. The semiconductor switch according to claim 1 , wherein in the case of regeneration, the semiconductor switch is turned on at the timing of the PWM control signal in which all the output voltages of the inverter bridge become the positive side voltage of the DC power supply. the motor controller. When the control circuit is a dynamic brake, all the inverter bridges are turned off, and the semiconductor switch is turned on.
3. The semiconductor switch according to claim 1, wherein in the case of regeneration, the semiconductor switch is turned on at a timing of the PWM control signal at which a line voltage applied from the inverter bridge to the motor becomes zero. Motor control device. 5. The motor control device according to claim 1, comprising a plurality of sets of the common resistor, the semiconductor switch, and the other diode . 6. The motor control device according to claim 5 , wherein the plurality of sets of the common resistors are connected in parallel. The motor control device according to claim 5 , wherein the plurality of sets of the common resistors are connected in series. The said control circuit adjusts the time of the said PWM control signal from which all the output voltages of the said inverter bridge become the positive side voltage of the said DC power supply, The any one of Claims 1-5 characterized by the above-mentioned. Motor control device. The motor control device according to claim 8, wherein the control circuit adjusts the time of the PWM control signal by adding an offset amount to a voltage command for generating the PWM control signal. 6. The control circuit according to claim 1, wherein the PWM control signal time during which the output voltage of the inverter bridge is all the positive voltage of the DC power supply is varied during the PWM period. The motor control apparatus of Claim 1 . 11. The control circuit according to claim 10, wherein the control circuit varies the time of the PWM control signal during a PWM cycle by adding an offset amount to a voltage command for generating the PWM control signal. Motor control device.