Sony Corporation

Tatsuya Kushima

Tomonori Kato

Ichiro Nakajima

Toshiyuki Arai

A method for driving the motor of multiple phase, where the number of windings in the coil of each phase can be changed, either in a first mode where all the windings in the coil of each phase are used or a second mode where the number of windings used is smaller than that of the first mode. The driving method includes a source voltage detector for supplying the driving method with a source voltage, a temperature detector for detecting an ambient temperature about the motor, and a controller for switching the action of the driving method to run the motor in either the first mode or the second mode in response to a result of the detection released from the source voltage detector or the temperature detector. Accordingly, the revolution of the motor can be maintained constant hence providing a degree of energy saving.

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Kanagawa, Japan

Tatsuya Kushima