Control apparatus for electric motor and control apparatus...

B - Operations – Transporting – 60 – L

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B60L 15/20 (2006.01) B60L 3/00 (2006.01) B60L 15/02 (2006.01)

Patent

CA 2380340

A corrected torque command value P_TRQ which is produced by correcting a torque command value TRQ with a torque command correcting unit 34 is substantially propor- tional to the armature current of an electric motor. Using the corrected torque command value P_TRQ and its average value P_ATRQ, an inferred temperature change .DELTA.tf of the electric motor is determined in each predetermined cycle time. The inferred temperature change .DELTA.tf calculated in a fuzzy inference operation, for example. The inferred tem- perature change .DELTA.tf is integrated by an integrating unit 37 to determine an accumulated temperature change .DELTA.Tf. The output of the electric motor is limited when the accumulat- ed temperature change .DELTA.Tf exceeds a predetermined value.

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