To provide a motor control device and an electric power steering device mounting the same capable of protecting a motor opening switch configured by a semiconductor switching element with high reliability.SOLUTION: A motor control device comprises a control unit that turns ON control of an inverter when abnormalities of the inverter are not detected, and turns OFF the control of the inverter when the abnormalities are detected or by an assist OFF command. The control unit comprises: an energy calculation unit that calculates energy of motor counter electromotive voltage and regeneration current when the control of the inverter is in an OFF state; and a determination unit that compares the energy with a safe operation region of an FET, and when the energy becomes within the safe operation region, turns OFF the FET of a motor opening switch. The safe operation region is determined on the basis of relation between drain current of the FET, drain-source voltage of the FET and ON width of the FET, and temperature characteristics of the maximum allowable loss of the FET.SELECTED DRAWING: Figure 6

    【課題】半導体スイッチング素子で構成されたモータ開放スイッチの保護を信頼性高く行うことのできるモータ制御装置及びそれを搭載した電動パワーステアリング装置を提供する。【解決手段】インバータの異常を検出していないときにインバータの制御をONにし、異常を検出したとき若しくはアシストOFF指令によりインバータの制御をOFFする制御部を具備し、制御部は、インバータの制御がOFFのときに、モータ逆起電圧及び回生電流のエネルギーを演算するエネルギー演算部と、エネルギーをFETの安全動作領域と比較し、エネルギーが安全動作領域の領域内となったときにモータ開放スイッチのFETをOFFする判定部と、を具備し、安全動作領域は、FETのドレイン電流、FETのドレイン−ソース電圧及びFETのオン幅との関係、及びFETの最大許容損失の温度特性に基づいて決まる。【選択図】図6


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    Title :

    MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE MOUNTING THE SAME


    Additional title:

    モータ制御装置及びそれを搭載した電動パワーステアリング装置


    Contributors:

    Publication date :

    2019-02-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    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



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