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    • 3. 发明授权
    • Overcurrent protection apparatus for DC motor
    • 直流电机过电流保护装置
    • US4473856A
    • 1984-09-25
    • US335358
    • 1981-12-29
    • Kenichiroh TakahashiHiromitsu NakanoIsao Yoshida
    • Kenichiroh TakahashiHiromitsu NakanoIsao Yoshida
    • H02H7/085H02H3/093H02H7/08
    • H02H7/0833
    • An overcurrent protection apparatus for a DC motor which can be used with a speed control system of a DC motor to prevent an overcurrent condition arising when the DC motor is run with a heavy load or locked by an overload from burning or overheating windings of the motor. The apparatus is constructed using at least one integrated circuit and includes a current mirror circuit for detecting an overcurrent and for cutting off the supply current of the DC motor. A timing circuit prevents overcurrents lasting only a short time from triggering the apparatus to shut down the motor. Once the apparatus is triggered to shut off the motor, the motor will remain off for an indefinite period of time until the apparatus is reset.
    • 一种用于直流电动机的过电流保护装置,其可与直流电动机的速度控制系统一起使用,以防止当直流电动机由重负载运行或被电动机的燃烧或过热绕组过载锁定时产生的过电流条件 。 该装置使用至少一个集成电路构造,并且包括用于检测过电流并用于切断直流电动机的供电电流的电流镜电路。 定时电路可防止持续时间短的过电流触发装置关闭电机。 一旦设备触发关闭电机,电机将保持关闭无限期,直到设备复位为止。
    • 4. 发明授权
    • Speed control apparatus for DC motor
    • 直流电机调速装置
    • US4477752A
    • 1984-10-16
    • US353420
    • 1982-03-01
    • Hiromitsu NakanoIsao Yoshida
    • Hiromitsu NakanoIsao Yoshida
    • H02P7/288G05B5/00
    • H02P7/2885Y10S388/902Y10S388/91
    • A speed control apparatus for DC motor (1), comprises a bridge circuit formed by the winding of the motor (1), a resistor (2) series thereto, and two resistors (3 and 4). Therein, a reference voltage (E.sub.r) is produced by dividing a voltage V.sub.ref of a constant voltage circuit (20) by a divider network (21+22). The voltage difference this reference voltage (E.sub.r) and a voltage produced across the detection output terminals "a" and "b" which is proportional to a counter electromotive force (E.sub.a) of the DC motor (1) is amplified by a differential amplifier (23+24). A current mirror circuit is formed by transistors (16), (17) and (18). The first transistor (16) regulated of its collector current (I.sub.r) by a constant current circuit (19) controls collector current of the second transistor (17), which controls input current of the constant voltage circuit (20). The third transistor (18) regulated of its collector current constantly controls the input current to the differential amplifier (23+24) for controlling the transistor (7) to control the motor current.
    • 一种用于直流电动机(1)的速度控制装置,包括由电动机(1)的绕组,与其串联的电阻器(2)和两个电阻器(3和4)形成的桥接电路。 其中,通过用恒定电压电路(20)的电压Vref除以分频网络(21 + 22)来产生参考电压(Er)。 与该直流电动机(1)的反电动势(Ea)成比例的检测输出端子“a”,“b”所产生的电压与该参考电压(Er)的电压差由差分放大器 23 + 24)。 电流镜电路由晶体管(16),(17)和(18)形成。 通过恒流电路(19)调节其集电极电流(Ir)的第一晶体管(16)控制控制恒压电路(20)的输入电流的第二晶体管(17)的集电极电流。 调节其集电极电流的第三晶体管(18)恒定地控制到差分放大器(23 + 24)的输入电流,以控制晶体管(7)来控制电动机电流。