Patent ID: 9698712
Date: 2017-07-04
CPC Classifications: H02P

Claim:
1. An inverter apparatus for controlling a three-phase alternating-current (AC) motor, the inverter apparatus comprising: an inverter circuit configured to supply a current to the three-phase AC motor; a capacitor provided at an input side of the inverter circuit; and a control unit configured to determine a command d-axis voltage value and a command q-axis voltage value, generate PWM signals of three phases based on the command d-axis voltage value and the command q-axis voltage value, and control the inverter circuit by outputting the PWM signals of three phases to the inverter circuit, the control unit including a first control mode and a second control mode each as a control mode for controlling the inverter circuit, wherein the control unit is configured to: in the first control mode, generate first PWM signals of three phases such that a command q-axis current value is set at 0 A, based on the determined command d-axis voltage value and the determined command q-axis voltage value; the control unit is configured to, in the second control mode, generate second PWM signals of three phases such that a command q-axis current value is set at a value other than 0 A, based on the determined command d-axis voltage value and the determined command q-axis voltage value; the control unit is configured to: in the first control mode, the control unit is configured to, in the second control mode, control the inverter circuit by outputting the second PWM signals of three phases.