Device for protection of the bearing of an electrical...

Details Device for protection of the bearing of an electrical... Device for protection of the bearing of an electrical...

2004-02-05

2008-11-04

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C702S058000, C702S059000, C323S361000

Reexamination Certificate

active

07446989

ABSTRACT:
A device for protecting the bearing of an electrical machine against the damaging passage of current, wherein the electrical machine comprises a stator and a rotor pivotally mounted relative to the stator by the bearing. The device is provided with a compensation circuit which produces a compensation current which compensates for a parasitic current formed during operation of the electrical machine by the bearing and a coupling element for directly or indirectly coupling the compensation current into the bearing.

REFERENCES:
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Toshihisa Shimizu et al., “High Frequency Leakage Control Reduction Based on a Common-Mode Voltage Compensation Circuit,”IEEE, pp. 1961-1967, 1996.
German Office Action dated Aug. 22, 2006.

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