US 12,451,835 B2
Avoiding electromagnetic interference (EMI) in electrical equipment and drive systems, e.g. used in radio astronomy
Matthias Jost, Mainz (DE); Pierre Dubois-Dit-Bonclaude, Mainz (DE); Jens Gotta, Mainz (DE); Christian Leinz, Burgbrohl (DE); Christoph Kasemann, Rheinbach (DE); and Gundolf Wieching, Bonn (DE)
Assigned to OHB Digital Connect GmbH, Bremen (DE); and Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.V., Munich (DE)
Appl. No. 18/018,499
Filed by OHB Digital Connect GmbH, Bremen (DE); and Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., Munich (DE)
PCT Filed Jul. 27, 2020, PCT No. PCT/EP2020/071101
§ 371(c)(1), (2) Date Jan. 27, 2023,
PCT Pub. No. WO2022/022799, PCT Pub. Date Feb. 3, 2022.
Prior Publication US 2023/0318515 A1, Oct. 5, 2023
Int. Cl. H02P 6/18 (2016.01); H02M 1/12 (2006.01); H02M 1/44 (2007.01); H02P 29/50 (2016.01)
CPC H02P 29/50 (2016.02) [H02M 1/123 (2021.05); H02M 1/44 (2013.01); H02P 6/183 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A drive system for sensitive devices used in radio astronomy, the drive system comprising:
a first motor;
a first converter configured to supply a first drive power to the first motor;
a control unit configured to control a rotational speed and/or a rotational position of the first motor;
a first power supply line for providing the first motor with the first drive power; and
a first signal line for providing the control unit with a signal indicating a measured rotational speed and/or a measured rotational position of the first motor,
wherein the drive system further comprises a shaft grounding element for grounding a drive shaft of the first motor,
wherein each one of the first power supply line and the first signal line further comprises a line filter unit being a low-pass filter for filtering electromagnetic interference signals by blocking frequencies higher than 30 MHz, and
wherein the shaft grounding element comprises a sliding contact element configured to enable electrical contact between the drive shaft of the first motor and the shaft grounding element while the drive shaft of the first motor is moved relative to the sliding contact element.