| 摘要 |
1. In an automatic washing machine including a commutating electric motor for driving the drum of the washing machine at a first comparatively low-washing speed and at a second comparatively high-spin-drying speed, the improvement comprising an automatic speed adjusting circuit for said motor comprising, a pair of input terminals adapted for connection to an AC voltage supply source, a supply circuit for the motor connected to the input terminals and provided with at least two further terminals, an electric heating element arranged to heat the wash water and connected across said two further terminals, a controlled rectifier connected in the supply circuit so as to regulate the motor speed at a given washing speed, and means connecting said two further terminals in the motor supply circuit so that the motor is at least substantially energized through at least a part of the heating element whereby it exhibits a speed characteristic which decreases very sharply with increasing load.
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