Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-12-05
2006-12-05
Schuberg, Darren (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S049030, C310S254100, C310S261100
Reexamination Certificate
active
07145278
ABSTRACT:
A permanent magnet type three-phase stepping motor that is simple in construction, with reduced vibration, a reduced unbalanced force in the radial direction, and high torque that can be manufactured at a low cost. The permanent magnet type three-phase stepping motor has a stator and a rotor arranged concentrically with the stator and with an air gap therebetween, said stator having three stator poles, and stator windings of three-phase each wound around each stator pole, each of said stator poles having m pieces of stator pole tooth, said rotor having two split rotor elements, a permanent magnet held between the rotor elements and magnetized so as to form N and S poles in the axial direction thereof, and a plurality (Nr) of small rotor teeth formed at a regular pitch on the outer peripheral surface of each of said rotor elements, said two split rotor elements being circumferentially shifted from each other by a ½ pitch of the small rotor teeth, wherein a pitch of the stator pole teeth is smaller than the pitch of the small rotor teeth, m is an integer and (Nr±2k)/3, Nr is 3n±1, n is an integer not less than 1, and k is an integer not less than 1 and not more than 4.
REFERENCES:
patent: 3866104 (1975-02-01), Heine
patent: 4234808 (1980-11-01), Geppert
patent: 4528473 (1985-07-01), Tezuka
patent: 4672253 (1987-06-01), Tajima
patent: 4748362 (1988-05-01), Hedlund
patent: 4983867 (1991-01-01), Sakamoto
patent: 5289064 (1994-02-01), Sakamoto
patent: 5309051 (1994-05-01), Kobori
patent: 5708310 (1998-01-01), Sakamoto et al.
patent: 5982118 (1999-11-01), Gotou et al.
patent: 6160330 (2000-12-01), Sakamoto
patent: 6249066 (2001-06-01), Ikegami et al.
patent: 6552451 (2003-04-01), Ikegami et al.
patent: 54099910 (1979-08-01), None
patent: 61069360 (1986-04-01), None
patent: 03212149 (1991-09-01), None
patent: 06038488 (1994-02-01), None
patent: 07123685 (1995-05-01), None
patent: 0 993 102 (2000-04-01), None
patent: 111233 (1993-03-01), None
An Optimized Module-type Hybrid Stepper Motor for Spacecraft Solar Array Drive, K.R. Rajagopal, et al., 7808-3773-5/97/$10.00 © 1997 IEEE (7 pgs).
Characteristics Of Permanent-Magnet Type 3-Phase Stepping Motor, Akira Tozune and Masafumi Sakamoto, 0-7803-3008-0/95 $4.00 © 1995 IEEE, pp. 748-755.
High Resolution Hybrid Stepper Motor With Pole Redundancy For Space Application, R.K. Rajagopal, et al. XP-002227569, pp. 705-710.
Optimierte Magnete Fur Hybridschrittmotoren, Eberhard Gollhardt, Sommerda, XP-000846999, F&M 106 (1998) 7-8 © Carl Hanser Verlag, Munchen, pp. 503-506.
Japan Servo Co. Ltd.
Patterson Thuente Skaar & Christensen P.A.
Scheuermann David W.
Schuberg Darren
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