Method and apparatus for heating electrical motors and like devices
    2.
    发明授权
    Method and apparatus for heating electrical motors and like devices 失效
    用于加热电动机和类似装置的方法和装置

    公开(公告)号:US4135122A

    公开(公告)日:1979-01-16

    申请号:US800204

    申请日:1977-05-25

    IPC分类号: H02K15/12 H02P7/00

    CPC分类号: H02K15/125 Y02E10/725

    摘要: 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.

    摘要翻译: 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。

    Radiation emitting system with pulse width and frequency control
    6.
    发明授权
    Radiation emitting system with pulse width and frequency control 失效
    具有脉冲宽度和频率控制的辐射发射系统

    公开(公告)号:US4156167A

    公开(公告)日:1979-05-22

    申请号:US704490

    申请日:1976-07-12

    申请人: John E. Sherman

    发明人: John E. Sherman

    IPC分类号: H05B33/08 H05B41/24

    CPC分类号: H05B33/0842 H05B33/0803

    摘要: The system includes a radiation emitter which is pulse driven by high current, low voltage full wave rectified direct current electrical power. Pulse frequency and width are controlled to provide periods of non-emissive operation sufficiently longer than the periods of emissive operation to maintain a desired emitter temperature. An electrically conductive case mounts the emitter in electrically conductive relation therewith and provides one current path to the emitter.

    摘要翻译: 该系统包括由高电流,低电压全波整流直流电力脉冲驱动的辐射发射器。 控制脉冲频率和宽度以提供比发射操作的周期足够长的非发射操作的周期以保持所需的发射器温度。 导电壳体将发射极与导电关系安装,并向发射器提供一个电流路径。