Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2001-08-07
2004-12-14
Tugbang, A. Dexter (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S592100, C029S596000, C029S602100, C029S609000, C083S029000, C083S035000, C083S036000, C083S050000, C310S216006, C310S216055, C310S216055, C310S256000
Reexamination Certificate
active
06829815
ABSTRACT:
FIELD OF THE INVENTION
The invention is directed to electric machine, and more particularly to a method of producing an electric machine rotor or stator from sheet metal blanks.
DESCRIPTION OF THE PRIOR ART
One method for producing a rotor of an electrical machine from sheet metal blanks in which the sheet-metal blanks, stamped out with a die, are embodied centrosymmetrically is known from German Patent Disclosure DE 32 46 356 A1. The sheet-metal blanks are arranged in the laminated rotor core, if the geometric embodiment of the blanks allows it, arranged in random distribution or at a certain angle relative to the next sheet-metal blank in the circumferential direction. The intent is largely to compensate for the magnetic anisotropy generated by the process of rolling the metal sheets. With asymmetrical sheet-metal blanks, however, this method fails, since the nonrotatability means that the magnetic preferential direction of all the sheet-metal blanks is oriented in the same direction.
ADVANTAGES SUMMARY OF THE INVENTION
The method of the invention with the has the advantage over the prior art that in a single work step, two congruent sheet-metal blanks are created, which depending on the angle of sheet-metal strip rotation have magnetic preferential directions extending differently, so that as a result, when the sheet-metal blanks are stacked in pairs to form a laminated rotor core or laminated stator core, extensive cancellation of the magnetic anisotropy can be achieved. By the multi-ply cutting of the sheet-metal blanks in one cutting operation, that is, using a die, tool costs are also saved, since otherwise two cutting tools would be required. The production costs for a laminated core are also reduced, since per cutting operation, a plurality of sheet-metal blanks can be created simultaneously.
REFERENCES:
patent: 4356377 (1982-10-01), Norton et al.
patent: 4578853 (1986-04-01), Wurth
patent: 4993290 (1991-02-01), Obradovic
patent: 5037706 (1991-08-01), Lin et al.
patent: 5095610 (1992-03-01), Schultz et al.
patent: 5261152 (1993-11-01), Simozaki et al.
patent: 5265320 (1993-11-01), Greenway
patent: 5309627 (1994-05-01), Burrage et al.
patent: 5744893 (1998-04-01), Zhao et al.
patent: 5826323 (1998-10-01), Walters
patent: 5923112 (1999-07-01), Bertocchi et al.
patent: 5997232 (1999-12-01), Sauer
patent: 6131268 (2000-10-01), Neuenschwander
patent: 6145424 (2000-11-01), Matsuda et al.
patent: 6223417 (2001-05-01), Saban et al.
patent: 6242840 (2001-06-01), Denk et al.
patent: 6374480 (2002-04-01), Rand
patent: 6487770 (2002-12-01), Bernauer et al.
patent: 3246356 (1984-06-01), None
patent: 111193 (1984-06-01), None
patent: 56091654 (1981-07-01), None
patent: 09141351 (1997-06-01), None
Henschel Matthias
Heyder Martin
Greigg Ronald E.
Kim Paul
Robert & Bosch GmbH
Tugbang A. Dexter
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