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    • 2. 发明申请
    • METHOD AND SYSTEM FOR BRAKING AN AC MOTOR
    • 用于制动交流电动机的方法和系统
    • WO2009105276A1
    • 2009-08-27
    • PCT/US2009/001137
    • 2009-02-23
    • SIEMENS ENERGY & AUTOMATION, INC.OSMAN, Richard H.RASTOGI, Mukul
    • OSMAN, Richard H.RASTOGI, Mukul
    • H02P3/22H02P21/14
    • H02P3/22H02P21/36
    • A system for braking a motor. The system includes at least one resistor and a contactor connected to the at least one resistor and a motor. The system further includes a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller. The variable frequency drive is configured such that motor flux levels may be maintained at a relatively high level as motor torque current is reduced, resulting in a consistently high motor flux level as the motor speed decreases.
    • 一种用于制动电机的系统。 该系统包括至少一个电阻器和连接到至少一个电阻器和电动机的接触器。 该系统还包括电连接到电动机的变频驱动器,其中变频驱动器包括可操作地连接到接触器的控制器,其中接触器的至少一部分关闭将至少一个电阻器连接到电动机,以响应于 命令从控制器。 变频驱动器被配置为使电动机磁通量水平可以保持在较高的水平,因为电动机转矩电流减小,导致马达速度降低时持续高的电动机通量水平。
    • 3. 发明申请
    • METHOD OF STARTING A SYNCHRONOUS MOTOR WITH A BRUSHLESS DC EXCITER
    • 用无刷DC EXCITER启动同步电机的方法
    • WO2008130700A2
    • 2008-10-30
    • PCT/US2008/005130
    • 2008-04-21
    • SIEMENS ENERGY & AUTOMATION, INC.OSMAN, Richard H.PATEL, KinjalRASTOGI, Mukul
    • OSMAN, Richard H.PATEL, KinjalRASTOGI, Mukul
    • H02P9/30
    • H02P9/302H02P1/50H02P21/00H02P25/03H02P2207/05
    • A starting method and system for a motor where the motor may be started as an induction motor by applying a magnetizing current to build flux through the stator, with the field current set at the maximum permissible exciter stator current (i.e., the current that will cause rated no-load current in the main field at the transition speed). The motor stator currents will be maintained at a value that allows the motor to generate sufficient breakaway torque to overcome any stiction. At a specific transition speed or after a period of time, the drive will initiate a transition from induction motor control to synchronous motor control by removing the initial magnetizing current, and a field current is then applied to the motor through the DC exciter. Once this transition is completed, the drive may ramp up to the desired speed demand.
    • 电动机的起动方法和系统,其中电动机可以通过施加磁化电流作为感应电动机起动以通过定子建立磁通,其中励磁电流设定在最大允许的励磁机定子电流(即将导致的电流) 在过渡速度下,在主场中额定空载电流)。 电动机定子电流将保持在允许电动机产生足够的分离转矩以克服任何静压的值。 在特定的转变速度或一段时间后,驱动器将通过移除初始磁化电流来启动从感应电动机控制转换到同步电动机控制,然后通过直流励磁器将励磁电流施加到电动机。 一旦完成这一转换,驱动器可能会升高到所需的速度要求。