| 摘要 |
A rotary speed control circuit for feeding a dc universal motor for driving a washing machine. A rectifier and a smoothing capacitor derive the operating voltage of the motor from the mains ac voltage and provided for control of the rotary speed is a regulating device (R) which controls a power stage for the motor, the power stage including a power switch (TR1) and a commutation diode (D1) in the topology of a low-setting device. The power stage feeding the motor includes a high-setting inductor (L) and can be switched over from the topology of a low-setting device to the topology of a high-setting device.
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