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    • 2. 发明授权
    • Method and apparatus for heating electrical motors and like devices
    • 用于加热电动机和类似装置的方法和装置
    • US4135122A
    • 1979-01-16
    • US800204
    • 1977-05-25
    • John R. HolmquistJohn E. Sherman
    • John R. HolmquistJohn E. Sherman
    • H02K15/12H02P7/00
    • H02K15/125Y02E10/725
    • A motor heat control circuit is provided for heating an electrical motor during the time of motor shutdown, with the circuit functioning to interconnect a winding of the motor with a source of alternating current voltage for substantially an entire half-cycle of the alternating current voltage but only at intervals comprising a selected plurality of cycles of the alternating current voltage. In its preferred form, the motor heat control circuit is adapted to be connected in shunt circuit with a main motor contactor normally interconnecting the motor winding with the source of alternating current voltage, and includes a controllable semi-conductor switch controlled by digital counting logic which is responsive to clock pulses developed from the alternating current voltage.
    • 提供电动机热控制电路,用于在电动机停机期间对电动机进行加热,该电路用于将马达的绕组与交流电压源互相交流,基本上为交流电压的整个半周期,但是 仅间隔地包括所选择的多个交流电压的周期。 在其优选形式中,电动机热控制电路适于与分流电路连接,主电动机接触器通常将电动机绕组与交流电压源互连,并且包括由数字计数逻辑控制的可控半导体开关 响应于从交流电压产生的时钟脉冲。