METHOD AND DEVICE FOR LOWERING INDUCED VOLTAGE OF INDUCTION MOTOR

摘要

An induction motor the drive of which is controlled by switching Y-connected windings (C1, C2, and C3), comprising switching means (1, S1, and S2) which switch the windings (C1, C2, and C3) and a control means (2) which controls the means (1, S1, and S2). When the motor is driven at a high speed, the control means (2) decreases the absolute values of the induced voltages of the disconnected windings (C2 and C3) by controlling the switching means (1, S1, and S2) so as to disconnect the windings (C2 and C3) except the high-speed winding (C1).