| 摘要 |
The aim of the invention is to produce, in the most economical way possible, a control device for DC motors that are provided with a commutator for feeding the motor windings that has at least four sliding contacts. Said control device comprises a modulation stage that generates a pulse-width modulated control signal having a clock frequency substantially above the motor speed, and a control circuit controlled by the at least one control signal, said control circuit having at least one load branch that feeds the commutator and an electronic switch that is controlled by the pulse-width modulated control signal. The aim of the invention is achieved by combining the sliding contacts to at least two control groups, combining within every control group the sliding contacts to parallel fed sliding contact pairs and by associating every control group with a load branch of its own. |
