Method and system for reducing bearing fluting in...

Details Method and system for reducing bearing fluting in... Method and system for reducing bearing fluting in...

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.

REFERENCES:
patent: 2957562 (1960-10-01), Rudisch
patent: 3873886 (1975-03-01), Kato et al.
patent: 4196805 (1980-04-01), Banno
patent: 4268758 (1981-05-01), Grassmann
patent: 4434448 (1984-02-01), Bell et al.
patent: 4511837 (1985-04-01), Vermeiren et al.
patent: 4604665 (1986-08-01), Muller et al.
patent: 4801252 (1989-01-01), Wrobel
patent: 4952830 (1990-08-01), Shirakawa
patent: 5313129 (1994-05-01), Stewart
patent: 5325005 (1994-06-01), Denk
patent: 5357160 (1994-10-01), Kaneda et al.
patent: 5442506 (1995-08-01), Kang
patent: 5594606 (1997-01-01), Hans et al.
patent: 5650678 (1997-07-01), Yokozawa et al.
patent: 5773906 (1998-06-01), Mukai et al.
patent: 5914547 (1999-06-01), Barahia et al.
patent: 5941547 (1999-08-01), Drake
patent: 5961222 (1999-10-01), Yabe et al.
patent: 5969450 (1999-10-01), Satterfield et al.
patent: 5977675 (1999-11-01), Oelsch
patent: 5988996 (1999-11-01), Brookbank et al.
patent: 6030128 (2000-02-01), Pontzer
patent: 6091173 (2000-07-01), Byrd
patent: 6147423 (2000-11-01), Byrd
patent: 6208098 (2001-03-01), Kume et al.
patent: 6478720 (2002-11-01), Barker
patent: 6572513 (2003-06-01), Whan-Tong et al.
patent: 6608410 (2003-08-01), Sato et al.
patent: 6670733 (2003-12-01), Melfi
patent: 3741678 (1989-06-01), None
patent: 101 61 820 (2002-09-01), None
patent: 0 403 924 (1990-12-01), None
patent: 0 403 924 (1990-12-01), None
patent: 1.217.229 (1960-05-01), None
The Boyanton Paper: “Bearing Damage Due to Electrical Discharge” by Hugh Boyanton, Vice President of Shaft Grounding Systems, Inc. (Printed from http://www.teleport.com/˜sgsi/paper1.html (26 pp.).
Busse, D. et al.; (Allen Bradley Drives Division, Mequon, WI); “Bearing Currents and Their Relationship to PWM Drives,” IEEE IECON Conference, Orlando, FL Nov. 1995.

Affiliated with

Also associated with

Rating

Method and system for reducing bearing fluting in... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for reducing bearing fluting in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for reducing bearing fluting in... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3571610