When a motor is started up, an initial position detection circuit detects the initial position of a rotor using an inductive sensing method. An automatic parameter generating circuit determines a parameter to be used by the initial position detection circuit. The automatic parameter generating circuit measures: (i) a first time period τ+ required for a coil current to reach a threshold after a first polarity voltage is applied across an electrode pair of the motor; and (ii) a second time period τ− required for the coil current to reach a threshold after a second polarity voltage is applied across the electrode pair, for each threshold value, while the threshold value used in the measurement is changed. The threshold that provides a maximum difference between the first time period τ+ and the second time period τ− is held as the parameter to be used by the initial position detection circuit.


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    Titel :

    Motor driving circuit and motor driving method


    Beteiligte:
    YOSHIYA TAKASHI (Autor:in) / MARUMOTO KYOJI (Autor:in)

    Erscheinungsdatum :

    2019-02-05


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    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 / B62D MOTOR VEHICLES , Motorfahrzeuge / G11B Informationsspeicherung mit Relativbewegung zwischen Aufzeichnungsträger und Wandler , INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER



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