A motor drive apparatus that can continue operation within the upper limit of system control even if a voltage drop of an AC power source occurs during operation of a motor used for a hoist or a crane is provided. The inverter control unit of the motor drive apparatus includes a speed reference setting means for setting the rotation speed of the motor, means for detecting a speed deviation between the output of the rotation speed detection means for detecting the rotation speed of the motor and the output of the speed reference setting means, means for controlling the output current of the inverter according to the output of the speed deviation. The speed reference setting means includes a correction circuit for correcting an external speed command given from outside. The correction circuit corrects the external speed command according to a deviation between a detection value of a DC voltage and a first reference value when a voltage drop signal is received from the voltage drop detection means, and makes the corrected speed command as the output of the speed reference setting means.


    Access

    Download


    Export, share and cite



    Title :

    MOTOR DRIVE APPARATUS


    Contributors:

    Publication date :

    2020-10-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66D Haspeln , CAPSTANS / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern




    Motor drive apparatus

    European Patent Office | 2020

    Free access

    Motor drive apparatus

    AIBA KENICHI / WATANABE KYOHEI / TAKASHIGE TAKAYUKI | European Patent Office | 2016

    Free access

    MOTOR AND DRIVE APPARATUS

    MURAKAMI JUN / YAMAMOTO KAZUYUKI / OGASAWARA DAISUKE et al. | European Patent Office | 2020

    Free access

    MOTOR DRIVE CONTROL APPARATUS

    SATO EIJI / SHAMOTO SUMIKAZU / KOMATSU MASAYUKI et al. | European Patent Office | 2019

    Free access