| 摘要 |
A control apparatus calculates a total loss change amount that is a power loss change amount of a motor control system including respective power loss change amounts of a converter, an inverter, and a motor of the motor control system. Based on the total loss change amount, during a correction-allowed period that is a period during which square wave control is performed, the control apparatus performs correction to decrease a current output voltage command value of the converter when the current output voltage command value is determined to be greater than the output voltage of the converter at which actual total power loss change amount becomes minimum. When the current output voltage command value is determined to be less than the output voltage of the converter at which actual total power loss change amount becomes minimum, the control apparatus performs correction to increase the current output voltage command value. |
| 主权项 |
1. A control apparatus for a motor control system,
the motor control system comprising:
a converter that steps up an output voltage of a direct-current power supply, the converter outputting a stepped-up output voltage;an inverter that includes a serially connected member composed of an upper-arm switch and a lower-arm switch, the inverter converting the output voltage of the converter to an alternating-current voltage; anda motor driven by the alternating-current voltage outputted from the inverter, the control apparatus comprising:
a command value setting unit that sets an output voltage command value of the converter;a converter control unit that controls the converter such that the output voltage of the converter is the output voltage command value set by the command value setting unit;an inverter control unit that selects and performs pulse width modulation control when a modulation factor of the output voltage of the inverter is less than a prescribed value, and selects and performs square wave control when the modulation factor is the prescribed value or greater,
the pulse width modulation control controlling the inverter such that a state in which the upper-arm switch is turned on and the lower-arm switch is turned off and a state in which the upper-arm switch is turned off and the lower-arm switch is turned on are performed, once each, during a single electrical angle cycle of the motor,the square wave control controlling the inverter such that a state in which the upper-arm switch is turned on and the lower-arm switch is turned off and a state in which the upper-arm switch is turned off and the lower-arm switch is turned on are performed, once each, during a single electrical angle cycle of the motor;a change amount calculating unit that calculates a total loss change amount that is a power loss change amount of the motor control system including respective power loss change amounts of the converter, the inverter, and the motor assuming that a current output voltage command value is changed by a predetermined value; anda correcting unit that
performs a process for performing correction to decrease the current output voltage command value when the current output voltage command value is determined to be greater than the output voltage of the converter at which total power loss change amount becomes minimum, based on the total loss change amount calculated by the change amount calculating unit, during a correction-allowed period that is a period during which the square wave control is performed, andperforms a process for performing correction to increase the current output voltage command value when the current output voltage command value is determined to be less than the output voltage of the converter at which actual total power loss change amount becomes minimum, based on the total loss change amount calculated by the change amount calculating unit, during the correction-allowed period. |
