A power converter for converting an electric power for a motor that has three-phase winding wires includes an inverter and a controller. The controller controls the electric power supplied for the three-phase winding wires. The controller either (i) sets a two-phase modulation period for performing a two-phase modulation control when a third frequency that is calculated as a triple frequency of a base wave of the phase currents is smaller than an audible lower limit frequency of a human audible frequency range, or (ii) performs a three-phase modulation control, when the third frequency is equal to or greater than the audible lower limit frequency. In such manner, a heat generation from the maximum heat generating portion of the power converter is mitigated, and a noise that is generated in the audible frequency range is reduced.
POWER CONVERTER AND ELECTRIC POWER STEERING APPARATUS USING SAME
2017-06-22
Patent
Electronic Resource
English
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