| 简介 |
PROBLEM TO BE SOLVED : To provide a controller which can suppress generation of demagnetization during operation of a motor including a permanent magnet composed while reducing or not containing a heavy rare earth element.
SOLUTION : The motor controller includes : a current component determination unit for determining the basic component of a current supplied to a motor, according to the operation state of a motor and the request output for the motor; a harmonic current control unit for determining the component of a harmonic current having a frequency higher than that of a current supplied to the motor; and a superposition unit for superposing the component of a harmonic current determined by the harmonic current control unit on the basic component of a current supplied to the motor. In an electrical angle region during rotation of the rotor of the motor, the harmonic current control unit determines the component of the harmonic current so that a bottom part of the amplitude of the harmonic current matches a region of an electrical angle where the permeance for a rotary magnetic field at a corner of a permanent magnet is relatively small.
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