TORQUE RIPPLE SUPPRESSION CONTROL DEVICE FOR PERMANENT MAGNET MOTOR, AND ELECTRIC POWER STEERING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a torque ripple suppression control device and an electric power steering system which can effectively use DC components of torque ripples.

SOLUTION: An induced voltage coefficient setting unit 8 outputs information signals Ked,-Ked,-ΔKed, Keqand-ΔKeqrelated to the induced voltage coefficient of a permanent magnet motor 1, based on a position-detected value θdcfrom a positional detector 5. A torque ripple suppression operation unit 9 outputs current correction commands ΔId*and ΔIq*, based on each information signal. The current correction commands ΔId*and ΔIq*are added to current commands Id0*, Iq0*from a current command conversion unit 7, and are outputted as current command values Id*and Iq*to a current control operation unit 10. The current control operation unit 10 outputs voltage command values Vdc*and Vqc*to a coordinate conversion unit 11, based on current detected values Idc, Iqc. The coordinate conversion unit 11 outputs voltage command values vu*, vv*and vw*of a three-phase AC to a power converter 2 using the voltage command commands Vdc*and Vqc*and the position-detected value θdc.

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