PROBLEM TO BE SOLVED: To provide a brush motor capable of achieving multipolarization and reduction in size and weight while preventing overheat caused by overcurrent.SOLUTION: A multipolar brush motor that generates a rotational power in one direction and that has four or more magnetic poles, comprises: a rotary armature having an equalizer line; a commutator provided on the rotary armature; first and second brushes contacted with the commutator; a duty controller that controls a duty of a voltage pulse applied between the first and second brushes; a PWM signal generator that outputs a PWM signal corresponding to information on the duty; a drive transistor connected between any one of the first and second brushes and any one of a power supply and the ground, and on/off-controlled by the PWM signal, and that applies a voltage of the power supply to between the first and second brushes as the voltage pulse; and a current detection element that detects a current value of a current flowing through the drive transistor. The duty controller controls the duty of the PWM signal in a case where the detected current value is larger than a set current value.SELECTED DRAWING: Figure 2

    【課題】過電流による過熱を防止しつつ、多極化および小型軽量化を図ることができるブラシモータを提供する。【解決手段】一方向の回転力を発生させる磁極が4極以上の多極のブラシモータであり、均圧線を有する回転電機子と、回転電機子に備えられた整流子と、整流子と接触する第1及び第2のブラシの各々と、第1及び第2のブラシの間に印加する電圧パルスのデューティを制御するデューティ制御部と、デューティの情報に対応するPWM信号を出力するPWM信号生成部と、第1及び第2のブラシの何れかと電源及びグランドの何れかとの間に接続され、PWM信号によりオンオフし、第1及び第2のブラシの間に電源の電圧を電圧パルスとして印加する駆動トランジスタと、駆動トランジスタに流れる電流の電流値を検出する電流検出素子を備え、デューティ制御部が、検出された電流値が設定した設定電流値を超えている場合、PWM信号のデューティを制御する。【選択図】図2


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    Title :

    BRUSH MOTOR


    Additional title:

    ブラシモータ


    Contributors:

    Publication date :

    2017-03-30


    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 / B60S SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR , Warten, Reinigen, Instandsetzen, Unterstützen, Anheben oder Rangieren von Fahrzeugen, soweit nicht anderweitig vorgesehen



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