| 摘要 |
A speed control circuit for triggering a motor, of the kind having a winding arrangement with multiple taps, comprises a plurality of electrical sources and a switching network coupled between the plurality of electrical sources and the taps of the winding arrangement. The switching network has selectively operable switches, for example, electronically controllable switches, for connecting more than one of the electrical sources to any one of the taps at the same time. A commutation controller is coupled to each of the electrical sources and each of the switches for operating the switches and the electrical sources. A feedback circuit provides information to the commutation controller with respect to the rotational speed and phase of the motor. The electrical sources may be arranged into groups, for accelerating and decelerating the motor. The electrical sources in each group may be connected to one another as partial electrical sources, the partial electrical sources of each group being connectable to any one of the taps at the same time. The respective groups of electrical sources may comprise complementary partial electrical sources of opposite polarity. The arrangement makes it possible for deceleration current to be applied to the winding arrangement without first interrupting an acceleration current, and vice versa. Rapid variations between various uniform operating speeds may be achieved without loss of synchronization between the motor and the control currents.
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