Motor having shifted teeth of pressed powder construction

Details Motor having shifted teeth of pressed powder construction Motor having shifted teeth of pressed powder construction

2004-09-13

2008-03-04

Tamai, Karl (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S181000, C310S156640, C310S044000

Reexamination Certificate

active

07339292

ABSTRACT:
A multi-polar rotary machine comprises a and a cylindrical outer rotor arranged concentrically with the stator and with an air gap therebetween. The stator has two splitted stator elements and a ring shaped permanent magnet held between the stator elements and magnetized so as to form N and S poles in the axial direction of the stator. Small axially separated stator teeth A and Ā andBand B are formed on the outer peripheral surface of the splitted stator elements. Stator windings for A phase and B phase are wound around the respective stator elements. The small stator teeth A, Ā,Band B are circumferentially shifted from corresponding small rotor teeth by a ¼ pitch of the small stator teeth, respectively. Each of the stator and rotor is formed of pressed powder consisting of soft magnetic material, and of resin and/or inorganic material. A ratio of a thickness of the small stator teeth Ā in the axial direction of the stator to a thickness of the small stator teeth A in the axial direction of the stator or a ratio of a thickness of the small stator teethBin the axial direction of the stator to a thickness of the small stator teeth B in the axial direction of the stator is set to a value smaller than 1 so as to equalize substantially in mean permeance both small stator teeth A and Ā orBand B to each other.

REFERENCES:
patent: 4206374 (1980-06-01), Goddijn
patent: 4306164 (1981-12-01), Itoh et al.
patent: 4327299 (1982-04-01), Goddijn
patent: 4488069 (1984-12-01), Field, II et al.
patent: 4899072 (1990-02-01), Ohta et al.
patent: 5719452 (1998-02-01), Sugiura
patent: 5723921 (1998-03-01), Sugiura
patent: 5834865 (1998-11-01), Sugiura
patent: 5856714 (1999-01-01), Sugiura
patent: 6441530 (2002-08-01), Petersen
patent: 2001/0038249 (2001-11-01), Ohnishi et al.
patent: 2002/0079749 (2002-06-01), Ohnishi et al.
patent: 2005/0062348 (2005-03-01), Ohnishi et al.
patent: 0568347 (1993-11-01), None
patent: 0812054 (1997-12-01), None
patent: 1289102 (2003-03-01), None
patent: 54084207 (1979-07-01), None
patent: 56-012856 (1981-02-01), None
patent: 56012856 (1981-02-01), None
patent: 57-208854 (1982-12-01), None
patent: 60-070958 (1985-04-01), None
patent: 03-112356 (1991-05-01), None
patent: 04-140056 (1992-05-01), None
patent: 06-165468 (1994-06-01), None
patent: 09-056137 (1997-02-01), None
patent: 09-233801 (1997-09-01), None
“Design of Brushless Permanent Magnet Motors” Hendershot et al, p. 3-1, Jan. 1994.

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