Rotation speed control circuit

摘要

In the case of a rotation speed control circuit for a DC universal motor (8), especially in the case of a washing machine, a rectifier (2) and a smoothing capacitor (C1, C2) derives the operating voltage for the motor (8) from the mains AC voltage, and a control electronics device (E) controls the rotation speed in at least two rotation speed ranges which can be selected. In order to make it possible to extend the rotation speed range, the rectifier (2) can be selected such that the operating voltage of the motor (8) is increased, in particular doubled. <IMAGE>