CPC H02P 3/18 (2013.01) [H02P 3/04 (2013.01); H02M 7/217 (2013.01)] | 24 Claims |
1. A drive system, comprising:
an electromagnetically operable brake including an energizable coil;
an electric motor; and
an electronic circuit including a rectifier, an upper controllable semiconductor switch, a freewheeling diode, and a varistor;
wherein a direct voltage provided by a rectifier is able to be made available by closing or by a pulse-width-modulated actuation of an upper controllable semiconductor switch of the coil, and opening the upper controllable semiconductor switch causes a current driven by the coil in a de-excitation of the coil to freewheel and/or flow through the freewheeling diode and the varistor or through a component connected in parallel with the varistor;
wherein the freewheeling diode and the varistor form a series circuit connected in parallel with a series circuit formed by the coil and a shunt resistor.
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