Motor drive apparatus equipped with dynamic braking control unit

摘要: A motor drive apparatus includes an inverter which has upper and lower arms each provided with a plurality of semiconductor switching devices free-wheeling diodes connected in reverse parallel respective ones the devices, wherein are controlled on off to convert DC AC, short-circuiting unit selector switch between phase windings synchronous motor, being opened closed under control command, dynamic braking which, upon reception start performs so as turn all either one other arm, thereafter controls that is closed.