Airflow control system
    2.
    发明授权
    Airflow control system 失效
    气流控制系统

    公开(公告)号:US4784580A

    公开(公告)日:1988-11-15

    申请号:US14305

    申请日:1987-02-13

    CPC分类号: F04D27/004 H02P25/20

    摘要: An airflow control system generates a compensating output which is combined with the normal damper control output in a damper operating device when a pole change motor driving a blower changes speed so that the damper is changed to compensate for the change in blower speed to avoid a large change in airflow. This overcomes the delay in the normal integrating damper control which produced unwanted fluctuation in airflow when the motor speed was changed.

    摘要翻译: 气流控制系统产生补偿输出,该补偿输出与减振器操作装置中的通常风门控制输出组合,当变速马达驱动鼓风机改变速度,从而改变阻尼器以补偿鼓风机速度的变化,以避免大的 气流变化 这克服了当电动机速度改变时在正常积分阻尼器控制中产生不希望的气流波动的延迟。

    Controlling system for a pole change electric motor
    3.
    发明授权
    Controlling system for a pole change electric motor 失效
    变极电机控制系统

    公开(公告)号:US4644242A

    公开(公告)日:1987-02-17

    申请号:US635344

    申请日:1984-07-27

    CPC分类号: D01G15/36 H02P25/20

    摘要: A controlling system for a pole change electric motor of the type wherein the polarity of electric currents flowing through some of stator windings is changed to change the number of poles thereby to vary the rotational frequency of the motor. The system comprises a reactor which is connected, during running of the motor at a high speed, in series to a power circuit for supplying power to the motor, whereby the motor is driven by way of the reactor when the motor is changed over from a low to a high speed running.

    摘要翻译: 用于这种类型的极点电动机的控制系统,其中流过一些定子绕组的电流的极性改变以改变极数,从而改变电动机的转动频率。 该系统包括在电动机高速行驶期间串联连接到用于向电动机供电的电力回路的电抗器,由此当电动机从电动机转换到电动机时由电动机驱动 低到高速运行。