Patent ID: 8207701

Claim:
A method of controlling an electromotor comprising: setting a target alternating axis current iq* based on a rotor angular velocity ω* of the electromotor and a target direct axis current id* based on the torque of the electromotor; simultaneously detecting three-phase currents ia, ib and ic and current rotor position angle θ of the electromotor; converting the three-phase currents ia, ib and ic of the electromotor to an actual alternating axis current iq and an actual direct axis current id by Park conversion and Clark conversion based on the rotor position angle θ of the electromotor; inputting the difference between the target alternating axis current iq* and the actual alternating axis current iq and the difference between the direct axis target current id* and the direct axis actual current id to a current loop, and outputting a required direct axis current id′ and a required alternating axis current iq′ after performing PI regulation to the input of the current loop; determining a required direct axis voltage ud and a required alternating voltage uq based on the required direct axis current id′ and the required alternating axis current iq′ output by the PI regulation; performing Park and Clark inverse conversions to the required direct axis voltage ud and the required alternating voltage uq based on the rotor position angle θ of the electromotor to determine three-phase voltages ua, ub and uc; calculating a duty ratio between PWM control waveform and the three-phase voltages ua, ub and uc to determine the PWM control waveform based on the duty ratio, wherein said PWM control waveform is configured to control the conversion from a direct current to an alternating current, and drive the electromotor using the converted alternating current; and wherein, said control method is configured to determine whether the current rotor acceleration of the electromotor is greater than a predetermined maximum acceleration and, if true, perform slipping management to eliminate the slipping of an electric vehicle.