| 摘要 |
A variable speed motor controller for an AC motor, said controller including a DC to AC converter for providing adjustable frequency AC signals to vary the speed of said motor, and a sensing device and energy saving control for detecting the magnitude of the current signal being supplied to the motor and adjusting the AC voltage to the motor depending upon the magnitude of the current signal. The smaller the motor current being sensed, the smaller the voltage applied to the motor, thereby effecting a saving of energy. Energy is saved using this controller because when the lesser motor current indicates that it is driving less than full load, the input voltage applied to the motor is reduced thereby effecting a power saving.
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