| 摘要 |
PURPOSE:To improve the output torque of a domestic massager in a low speed range at the time of loading by feeding back a counterelectromotive force generated in a motor winding to a phase control circuit. CONSTITUTION:The output of a commercial power source is supplied through a triac TRC and a bridge rectifier DB to a motor M. A diac DA for gate- triggering the triac TRC is controlled by variable time constant circuits VR, R2, C, and also controlled by the counterelectromotive force of the motor M through an R3. Thus, a driving torque corresponding the stable speed and load can be generated when the motor operates at a low speed.
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