| 摘要 |
An induction motor is driven by a high frequency alternating current and is provided with a rotor and a stator, which are provided with a conductor winding. The rotor winding is connected with a capacitor to form a resonance loop. The stator winding is provided with the high frequency alternating current to generate a high speed rotating alternating magnetic field. The rotor generates a rotor current via induction and electromagnetic resonance effect, so as to interact with the stator magnetic field to enable the motor to turn, thereby overcoming the friction problem of the conventional ultrasonic motor. The motor of the present invention uses the stator winding or coil to carry out the self-detection of revolution rate. The low frequency enclosure component is taken out by using the voltage or current of the winding. The frequency of the low frequency component is directly proportional to the revolution rate of the motor, so as to serve as the speed control or the speed exhibition. The controller of the induction motor is simplified by the motor speed control device, which is formed of an analog circuit or a digital circuit.
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