Brushless motor control method and brushless motor

Details Brushless motor control method and brushless motor Brushless motor control method and brushless motor

2007-02-07

2011-11-01

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400010, C318S400340, C318S400350

Reexamination Certificate

active

08049449

ABSTRACT:
In a brushless motor for an electric power steering device having a configuration of 2 poles and 3 slots, or of an integral multiple thereof, a stator coil is supplied with current containing a higher harmonic component. A difference of 0.5% to 1.5% is provided between the higher harmonic component content rate of the stator coil current and the higher harmonic component content rate of the induced electromotive force generated in the stator coil with rotation of a permanent magnet, thereby mitigating the influence by an armature reaction generated in the induced electromotive force to reduce torque ripples. The difference between the higher harmonic component content rates is set on the basis of a change that occurs in the induced electromotive force due to the armature reaction at a time of supplying electricity to the armature coil.

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Written Opinion of the International Searching Authority mailed Aug. 28, 2008 for International Application No. PCT/JP2007/052093.

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