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    • 5. 发明授权
    • Apparatus and method for detection and control of circulating currents
in a variable speed DC motor
    • 用于检测和控制变速直流电机中的循环电流的装置和方法
    • US5552685A
    • 1996-09-03
    • US219022
    • 1994-03-28
    • Glen C. YoungGuy Bonner, Jr.Eric D. Schneider
    • Glen C. YoungGuy Bonner, Jr.Eric D. Schneider
    • H02H7/08H02P6/00H02P5/40
    • H02P6/15H02P6/08H02P6/182H02H7/0838
    • A current regulation circuit for a motor. The motor includes a stationary assembly having windings adapted for energization in at least one preselected sequence and a rotatable assembly in magnetic coupling relation to the stationary assembly. A power supply link connects the windings to a power supply and includes power switching devices for selectively energizing the windings in the preselected sequence by selectively connecting the power supply link to the windings to produce an electromagnetic field for rotating the rotatable assembly. The power switching devices each have a conducting state and a nonconducting state. The current regulation circuit includes a timing circuit, a current sensing circuit and a control circuit. The timing circuit defines preset periods during which each of the power switching devices may be nonconducting. The current sensing circuit senses current in the power supply link. The control circuit controls the power switching devices so that each of the power switching devices is nonconducting when the sensed current exceeds a peak current reference level during the preset periods. In this manner, the current regulation circuit controls current which circulates during periods when only one power switching device is conducting.
    • 电动机的电流调节电路。 马达包括具有适于在至少一个预选序列中通电的绕组的固定组件和与静止组件的磁耦合关系的可旋转组件。 电源链路将绕组连接到电源,并且包括功率开关装置,用于通过选择性地将电源链路连接到绕组以产生用于旋转可旋转组件的电磁场来选择性地以预选序列激励绕组。 功率开关器件各自具有导通状态和非导通状态。 电流调节电路包括定时电路,电流检测电路和控制电路。 定时电路定义了每个功率开关器件可能是不导通的预设周期。 电流检测电路检测电源链路中的电流。 控制电路控制功率开关器件,使得当在预设时段期间感测到的电流超过峰值电流参考电平时,每个功率开关器件都是不导通的。 以这种方式,电流调节电路控制在只有一个电源开关装置导通的时段期间循环的电流。