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US08193744B2 Method and apparatus for quiet fan speed control 有权
安静风扇转速控制的方法和装置

Method and apparatus for quiet fan speed control
Abstract:
A method for controlling the speed of an AC motor by means of an AC motor speed control having a plurality of capacitors operable to be selectively coupled in parallel electrical connection, the parallel coupled capacitors operable to be coupled in series electrical connection with the AC motor, the method comprising charging the capacitors up to substantially the same predetermined voltage prior to combining the capacitors in parallel electrical connection.
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