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149 条记录 (耗时 0.014 秒)

    Control for bumpless transfer of an AC motor between a solid-state inverter and a supply mains
    51.
    发明授权
    Control for bumpless transfer of an AC motor between a solid-state inverter and a supply mains 失效
    控制在固态逆变器和电源之间的交流电机的无扰动传输

    公开(公告)号：US4587474A

    公开(公告)日：1986-05-06

    申请号：US626712

    申请日：1984-07-02

    申请人： Paul M. Espelage ,  David L. Lippitt ,  James M. Nowak

    发明人： Paul M. Espelage ,  David L. Lippitt ,  James M. Nowak

    IPC分类号： H02P27/06 ,  H02J3/40 ,  H02P1/28 ,  H02P1/30

    CPC分类号： H02J3/40

    摘要： A power conditioner having a source and load converter each using a phase-locked loop to control their respective converter firings achieves synchronization with a supply mains by determining the phase error between supply mains and motor voltages by obtaining the instantaneous difference between the output signals of the source and load phase locked loops. This phase error is passed through a simple gain and summed with a speed regulator setpoint, which now becomes an inverter frequency regulator with the nominal setpoint being the supply mains frequency. The voltage amplitude error between the supply mains and the motor is obtained by comparing the absolute value of the source voltage with the properly scaled absolute value of the integrated motor voltage and this error signal is input to the flux regulator in a synchronous or induction motor controller in place of the normal input when not synchronizing.

    摘要翻译： 具有源和负载转换器的功率调节器，每个使用锁相环来控制它们各自的转换器启动，通过确定电源和电动机电压之间的相位误差来获得与供电电源的同步，从而获得 源和负载锁相环。 该相位误差通过简单增益传递，并与速度调节器设定值相加，调速器设定值现在变为变频器频率调节器，标称设定值为供电电源频率。 通过将源电压的绝对值与积分电动机电压的适当比例的绝对值进行比较，得到电源和电动机之间的电压幅度误差，该误差信号输入到同步或异步电动机控制器中的通量调节器 代替正常输入时不同步。

    Method of starting variable-speed induction motor
    52.
    发明授权
    Method of starting variable-speed induction motor 失效
    启动变频感应电动机的方法

    公开(公告)号：US4481455A

    公开(公告)日：1984-11-06

    申请号：US536871

    申请日：1983-09-29

    申请人： Osamu Sugimoto ,  Shinobu Ishizaka ,  Youji Tanaka ,  Noboru Suzuki

    发明人： Osamu Sugimoto ,  Shinobu Ishizaka ,  Youji Tanaka ,  Noboru Suzuki

    IPC分类号： H02P1/30 ,  H02P1/26

    CPC分类号： H02P1/30

    摘要： This method of starting a variable-speed induction motor utilizes a speed control of the induction motor by varying the output frequency from a cycloconverter. The method comprises applying an output from the cycloconverter to the secondary winding of the induction motor while the primary winding of the induction motor is short-circuited during the start-up of the motor, applying a voltage lower than the line voltage to the primary winding when the induction motor is operating within an intermediate speed range, and applying the line voltage within a speed region near the rated speed. This method enables speed control over a wide range, and provides a sufficiently large start-up torque for the induction motor.

    摘要翻译： 这种启动变速感应电动机的方法是通过改变来自循环换流器的输出频率来利用感应电动机的速度控制。 该方法包括：在马达启动期间，感应电动机的初级绕组短路的同时，将来自循环换流器的输出施加到感应电动机的次级绕组，向初级绕组施加低于线路电压的电压 当感应电动机在中速范围内运行时，并将线路电压施加在接近额定转速的速度区域内。 该方法能够在宽范围内进行速度控制，并为感应电动机提供足够大的起动转矩。

    Cold start system for motors
    53.
    发明授权
    Cold start system for motors 失效
    电机冷起动系统

    公开(公告)号：US4100466A

    公开(公告)日：1978-07-11

    申请号：US749651

    申请日：1976-12-10

    申请人： George Francis Schroeder

    发明人： George Francis Schroeder

    IPC分类号： G01C19/08 ,  H02P1/30 ,  H02P1/58 ,  G01F1/82

    CPC分类号： H02P1/58 ,  H02P1/30

    摘要： Motors, particularly gyro motors, are started by initially operating the motors at a frequency lower than their normal operating frequency so as to draw a larger current and develop greater starting torque with the maximum current and torque limited by a current limiting DC power supply. Where at least two motors are provided sequencing of the two motors is accomplished thereby permitting use of essentially the same power supply which is required for normal operation.

    摘要翻译： 电机，特别是陀螺仪电机通过初始以低于其正常工作频率的频率操作电机来启动，以便绘制更大的电流，并且通过限流直流电源限制的最大电流和转矩产生更大的启动转矩。 在提供至少两个电动机的情况下，完成两个电动机的排序，从而允许使用基本相同的电源，这是正常运行所需要的。