US 11,722,076 B2
Drive system and method for operating a drive system
Timo Hufnagel, Eppingen (DE); Hans Jürgen Kollar, Bruchsal (DE); and Christopher Reichert, Karlsdorf-Neuthard (DE)
Assigned to SEW-EURODRIVE GMBH & CO. KG, Bruchsal (DE)
Appl. No. 17/424,655
Filed by SEW-EURODRIVE GMBH & CO. KG, Bruchsal (DE)
PCT Filed Jan. 13, 2020, PCT No. PCT/EP2020/025010
§ 371(c)(1), (2) Date Jul. 21, 2021,
PCT Pub. No. WO2020/151914, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 102019000330.6 (DE), filed on Jan. 21, 2019.
Prior Publication US 2022/0131484 A1, Apr. 28, 2022
Int. Cl. H02P 3/18 (2006.01); H02P 3/04 (2006.01); H02M 7/217 (2006.01)
CPC H02P 3/18 (2013.01) [H02P 3/04 (2013.01); H02M 7/217 (2013.01)] 24 Claims
OG exemplary drawing
 
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.