Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-07-04
2006-07-04
Schuberg, Darren (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C482S051000, C198S952000
Reexamination Certificate
active
07071589
ABSTRACT:
A non-conductive insulating ring (210) is inserted between a motor bell (130) and a motor bearing (135) that supports a motor shaft (110). Stray currents that normally discharge thorough the motor shaft and the motor bearing to the motor bell are prevented due to the non-conductive nature of the insulating ring. Additionally, the motor shaft is grounded to provide a low-impedance alternative path to stray shaft currents. When a fast-switching frequency converter is used to drive the motor shaft, additional arrangements such as a common mode choke, reduction of the switching frequency of the converter, and reduction of the turn-of/off rate of a semiconductor device used in the converter, may be provided to further reduce the stray currents flowing thorough the motor bearings.
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Bramel Rodney
Silbernagel Robert
Elkassabgi Heba
Precor Incorporated
Schuberg Darren
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