US 11,923,798 B2
Drive system with inverter and electric motor, and method for operating a drive system
Norbert Hettel, Au am Rhein (DE); and Alexander Kolbert, Weingarten (DE)
Assigned to SEW-EURODRIVE GMBH & CO. KG, Bruchsal (DE)
Appl. No. 17/429,393
Filed by SEW-EURODRIVE GMBH & CO. KG, Bruchsal (DE)
PCT Filed Jan. 23, 2020, PCT No. PCT/EP2020/025028
§ 371(c)(1), (2) Date Aug. 9, 2021,
PCT Pub. No. WO2020/160841, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 102019000875.8 (DE), filed on Feb. 7, 2019.
Prior Publication US 2022/0149758 A1, May 12, 2022
Int. Cl. H02P 3/22 (2006.01)
CPC H02P 3/22 (2013.01) 22 Claims
OG exemplary drawing
 
1. A drive system, comprising:
an electric motor;
an inverter having an AC-voltage-side terminal adapted to feed the electric motor;
a first series circuit, including a brake resistor and a first controllable semiconductor switch, connected at a DC-voltage-side terminal of the inverter;
a second series circuit, including an impedance and a controllable second semiconductor switch, connected and/or switched in parallel with the first series circuit; and
a signal electronics connected to a voltage acquisition device adapted to acquire a voltage applied at the DC-voltage-side terminal of the inverter, the signal electronics being configured to generate an actuation signal for the first semiconductor switch and an actuation signal for the second semiconductor switch to close the first semiconductor switch when the voltage exceeds a first threshold value, to open the first semiconductor switch when the voltage exceeds a third threshold value, and to close the second semiconductor switch when the voltage exceeds a fourth threshold value.