Control circuit for cooling fans
    61.
    发明授权
    Control circuit for cooling fans 失效
    冷风机控制电路

    公开(公告)号:US3794896A

    公开(公告)日:1974-02-26

    申请号:US3794896D

    申请日:1972-12-29

    发明人: HOLT W

    CPC分类号: F01P7/08

    摘要: A control circuit for an electrically driven cooling fan has a relay for switching the fan in and out. Associated with the relay is resistance means for reducing the differential between the on and off points of the fan.

    摘要翻译: 用于电驱动冷却风扇的控制电路具有用于切换风扇进出的继电器。 与继电器相关联的是用于减小风扇的开和关点之间的差分的电阻装置。

    Speed control of electrical motors
    62.
    发明授权
    Speed control of electrical motors 失效
    电动马达速度控制

    公开(公告)号:US3743907A

    公开(公告)日:1973-07-03

    申请号:US3743907D

    申请日:1971-05-10

    申请人: DOSCH P BENZ E OEHMANN M

    发明人: OEHMANN M BENZ E DOSCH P

    摘要: Circuit arrangements for applying an increasing voltage to a motor with increasing motor speed in a lower speed range and for applying a decreasing voltage to a motor with increasing motor speed in a higher speed range both to obtain proper regulation of the motor while avoiding overheating in startup and overload conditions and to adapt said motor in the startup condition to loads having variable speed-torque requirements.

    摘要翻译: 用于在较低速度范围内以增加的电动机速度向马达施加增加的电压并且在较高速度范围内以增加的电动机速度向马达施加降低的电压的电路装置,以便在启动期间避免过热时适当地调节电动机 和过载条件,并使起动状态下的所述电动机适应具有可变速度 - 转矩要求的负载。

    Solid state power controller for dc permanent magnet and shunt field winding motors supplied from an ac source
    63.
    发明授权
    Solid state power controller for dc permanent magnet and shunt field winding motors supplied from an ac source 失效
    用于从AC源提供的直流永磁体和分流型励磁电机的固态功率控制器

    公开(公告)号:US3639822A

    公开(公告)日:1972-02-01

    申请号:US3639822D

    申请日:1970-05-11

    申请人: CUTLER HAMMER INC

    摘要: A solid state switching circuit and power controller for permanent magnet and shunt field winding motors used in portable power tools and the like. The power controller employs a bidirectional thyristor triode and trigger diode for varying the current supplied to the motor armature, and a full-wave rectifier bridge to establish unidirectional current flow through the motor armature on opposite half cycles of the AC power supply. A resistor across the AC terminals of the rectifier bridge enhances control action under light loads.

    摘要翻译: 用于便携式电动工具等的永久磁铁和分流场绕组电机的固态开关电路和功率控制器。 功率控制器采用双向晶闸管三极管和触发二极管,用于改变提供给电机电枢的电流,以及全波整流桥,以在交流电源的相反半周期上建立通过电机电枢的单向电流。 整流桥的交流端子之间的电阻增强了轻负载下的控制动作。