To provide a demagnetization determination method capable of accurately determining the demagnetization of a permanent magnet of a permanent synchronous motor.SOLUTION: When a vehicle is idling (S1: YES), a command value of a current supplied to a motor is set to zero (S4), and a counter electromotive voltage generated in the motor in that state is detected (S5). Based on the counter electromotive voltage, it is determined whether a permanent magnet used in a rotor of a motor 2 is demagnetized. Specifically, the rotation speed of the motor 2 is detected, and a counter electromotive voltage constant is obtained by dividing the counter electromotive voltage by the rotation speed (S6). When the counter electromotive voltage constant is less than a threshold, it is determined that the permanent magnet is demagnetized (S7: YES, S8).SELECTED DRAWING: Figure 2

    【課題】永久磁石同期電動機の永久磁石の減磁を精度よく判定できる、減磁判定方法を提供する。【解決手段】車両の空走時に(S1:YES)、モータに供給される電流の指令値が零に設定されて(S4)、その状態でモータに生じる逆起電圧が検出される(S5)。そして、逆起電圧に基づいて、モータ2の回転子に用いられている永久磁石が減磁しているか否かが判定される。具体的には、モータ2の回転数が検出されて、逆起電圧を回転数で除算することにより逆起電圧定数が求められ(S6)、その逆起電圧定数が閾値未満である場合に永久磁石が減磁していると判定される(S7:YES,S8)。【選択図】図2


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    Titel :

    DEMAGNETIZATION DETERMINATION METHOD


    Weitere Titelangaben:

    減磁判定方法


    Beteiligte:
    UEDA MITSUO (Autor:in)

    Erscheinungsdatum :

    2021-02-22


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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