| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric compressor capable of eliminating an inertial energy caused by reverse rotation of a motor, and of suppressing activation failures.SOLUTION: A motor drive control device 4 stops a motor, and then, performs reverse rotation alleviation control so that a reverse rotation speed becomes less than a reverse rotation speed of a rotor generated by a differential pressure between high-pressure cooling medium and low-pressure cooling medium. In a case where there is a re-activation request during the reverse rotation alleviation control, the motor drive control device 4 performs all brake control of energizing all high-side or low-side switching elements, or all brake control of energizing one high-side switching element and one low-side switching element, or energizing two of high-side switching elements Uh, Vh, and Wh for three phases and one of low-side switching elements Ul, Vl, and Wl for three phases, or energizing one of the high-side switching elements Uh, Vh, and Wh for three phases and two of the low-side switching elements Ul, Vl, and Wl for three phases, and then, rotates the motor normally. |
