Patent · US Active

Apparatus for reducing dangerous bearing voltages

US11081942B2 · kind B2 · utility

1Cited by

0References

14Claims

0Family size

Assignee

ebm-papst Mulfingen GmbH & Co. KG · DE

Inventors

Sebastian Schroth · Kupferzell, DE
Marco Weckert · Künzelsau, DE
Manuel Walter · Lochau, AT

Key dates

Filing date	Nov 18, 2019
Grant date	Aug 3, 2021
Priority date	—
Expiry date	Feb 7, 2040

Classification

Technology area (CPC H)Electricity
CPC primaryH02K7/085
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An apparatus (1) for reducing bearing voltages in an electric machine (M) with a rotor (2) and a stator (3). A rotor-side and stator-side bearing outer ring (4r, 4s) and a respective bearing inner ring (4i) are provided between the rotor (2) and stator (3). A connection electronics system connect with the motor (M). A compensation arrangement (20) adjusts the potential (ULA-stator) of the bearing voltage at the bearing outer rings (4r, 4s) and the respectively corresponding bearing inner ring (4i) to an identical value. The compensation arrangement (20) comprises an impedance (ZKOMP), of at least one first impedance (ZKOMP, R) between the stator (3) and the rotor-side bearing outer ring (4r). The impedance (ZKOMP) has at least one impedance (ZKOMP. S) between the stator (3) and the stator-side bearing outer ring (4s).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.