Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2005-02-15
2005-02-15
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S219000, C310S231000, C310S238000
Reexamination Certificate
active
06856062
ABSTRACT:
A homopolar machine produces an axial counter force on the rotating shaft to compensate for the load on the shaft's thrust bearing to reduce wear and noise and prolong bearing life. The counter force is produced through magnetic interaction between the shaft and the machine's field coils and is created by changing the current excitation of the field coils, which results in a magnetic flux asymmetry in an inner flux return coupled to the shaft. The homopolar machine may also have a configuration that uses current collectors that maintain substantially constant contact pressure in the presence of high magnetic fields to improve current collector performance. The current collectors are flexible and may be made from either electrically conductive fibers or stacked strips such that they bear up against the armature so that the pressure is maintained by the spring constant of the current collector material. The homopolar machine may also have a configuration where the brushes are oriented so that the current is aligned as much as is practical with the local magnetic field lines so as to reduce the lateral electromagnetic forces on the brushes.
REFERENCES:
patent: 3890019 (1975-06-01), Boden et al.
patent: 3944865 (1976-03-01), Jewitt
patent: 3976339 (1976-08-01), Sabnis
patent: 4110648 (1978-08-01), Stillwagon
patent: 4180296 (1979-12-01), Habermann
patent: 4185216 (1980-01-01), Mole et al.
patent: 4208600 (1980-06-01), Hatch
patent: 4241271 (1980-12-01), Johnson et al.
patent: 4271369 (1981-06-01), Stillwagon
patent: 4276507 (1981-06-01), Stillwagon
patent: 4399381 (1983-08-01), Chabrerie
patent: 4581555 (1986-04-01), Kuznetsov et al.
patent: 4602179 (1986-07-01), Kuznetsov et al.
patent: 4710656 (1987-12-01), Studer
patent: 4710666 (1987-12-01), Rindal et al.
patent: 4858304 (1989-08-01), Weldon et al.
patent: 5010563 (1991-04-01), Laurent et al.
patent: 5027280 (1991-06-01), Ando et al.
patent: 5032748 (1991-07-01), Sakuraba et al.
patent: 5216308 (1993-06-01), Meeks
patent: 5278470 (1994-01-01), Neag
patent: 5349256 (1994-09-01), Holliday
patent: 5385007 (1995-01-01), Hartel et al.
patent: 5451825 (1995-09-01), Strohm
patent: 5481149 (1996-01-01), Kambe et al.
patent: 5514924 (1996-05-01), McMullen et al.
patent: 5517072 (1996-05-01), Hildebrandt
patent: 5530309 (1996-06-01), Weldon
patent: 5572079 (1996-11-01), Pinkerton
patent: 5587618 (1996-12-01), Hathaway
patent: 5729066 (1998-03-01), Soong et al.
patent: 5731645 (1998-03-01), Clifton et al.
patent: 5739606 (1998-04-01), Takahata et al.
patent: 5767597 (1998-06-01), Gondhalekar
patent: 5804899 (1998-09-01), Jamain et al.
patent: 5821659 (1998-10-01), Smith
patent: 5834867 (1998-11-01), Kikuchi et al.
patent: 6245440 (2001-06-01), Kuhlmann-Wilsdorf et al.
patent: 6489700 (2002-12-01), Heiberger et al.
patent: 6628033 (2003-09-01), Heiberger et al.
patent: 10-136622 (1998-05-01), None
Heiberger Michael
Reed Michael Robert
Fitch Even Tabin & Flannery
General Atomics
Mullins Burton
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