Importance

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Abstract

A control device (50) for an IPM-type brushless motor (3) includes a fundamental-current calculating section (52) for calculating fundamental-wave currents indicating winding current values to be set in maximum-torque control, a correction-component calculating section (59) for calculating a first harmonic component (B sin 6(θ+β)) for cancelling a torque ripple for a magnet torque and a second harmonic component (A sin 6(θ+α)) for cancelling a torque ripple for a reluctance torque based on phase-current values detected by a current sensor (64), a correction map (58) storing relationships between the phase currents and parameters (A, B, α, and β) of the first harmonic component and the second harmonic component, and a current-correcting section (60) for superimposing the first harmonic component and the second harmonic component respectively on the fundamental-wave currents to correct a current to be supplied so as to generate current command values (Id′ and Iq′).

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First Claim