Drive control apparatus and method of alternating current motor

摘要: A drive control apparatus and method drives an AC motor by applying a rectangular wave voltage thereto. The estimates the torque of rotor motor, detects deviation which is difference between estimated required motor. controller controls state applied to through feedback based on deviation, so that approaches command value. current rotation speed switches, in predetermined order, plurality states corresponding different phase values voltage. switching timing set deviates from reference determined speed, length time deviation.