Patent ID: 9281774
Filing Date: 2016-03-08
CPC Classification: B60L,H02P,Y02T

Claim Text:
1. A motor control system comprising: a converter that is configured to be able to step up a direct-current voltage, supplied from a power supply, in accordance with a system voltage command value; an inverter that is configured to convert the direct-current voltage, which is a system voltage output from the converter, to an alternating-current voltage; a motor that is driven by the alternating-current voltage applied from the inverter; and a control unit that is configured to drive the motor in any one of control methods of sinusoidal PWM control, overmodulation control and rectangular wave control by executing operation control of the converter and the inverter, wherein the control unit is configured to start step-up operation of the converter when a current vector of motor current of the motor on a d-q coordinate plane becomes the current phase corresponding to motor torque, at which a system loss is equal between before and after starting the step-up operation, while the control unit supplies the direct-current voltage, supplied from the power supply, to the inverter without stepping up the direct-current voltage by the converter and performs the rectangular wave control of the motor in a state where the current phase is an optimal current phase.