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-order harmonic frequency that is calculated as triple the frequency of a fundamental frequency 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-order harmonic 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 acoustical noise that is generated in the audible frequency range is reduced.


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    Title :

    Power converter and electric power steering apparatus using same


    Contributors:

    Publication date :

    2019-04-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern



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