| 摘要 |
<p>A single transformer (T) comprises a common core constituting a closed circuit, and primary and secondary windings (Cai, Cbi) and (Cao, Cbo) of the respective phases. Driving signals of the phases are inputted to the respective primary windings (Cai, Cbi). In the transformer (T), the signals interfere with each other, and the interference influences the transformer output voltage of the secondary windings (Cao, Cbo) supplied to an oscillator (5v). However, the influence is so small that the voltages of the respective phase are slightly different from each other, and the predetermined phase difference is maintained. Therefore, without causing any practical problem, the ultrasonic motor can be well driven, and the number of transformers, which are large and most expensive in the drive system of the ultrasonic motor, can be decreased, reducing the cost and size.</p> |
