Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-02-12
1998-05-05
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
318696, H02K 3704
Patent
active
057478988
ABSTRACT:
In a hybrid type stepping motor, variation in the torque is reduced to as low as possible, the torque stiffness is improved, and the resonant vibration during the rotating movement is minimized. Each fixed magnetic pole has two or more of small teeth arranged at intervals of the same pitch as of the teeth of a rotor. The total number of the small teeth of a stator segment of an asymmetrical form is determined by NS=5x(n0+n1), where n0 is the number of the small teeth on each of five of the ten fixed magnetic poles and n1 is the number of the small teeth on each of the remaining five fixed magnetic poles. The fixed magnetic poles with the n1 small teeth are arranged alternately with the fixed magnetic poles with the n0 small teeth. The n1 small teeth poles and the n0 small teeth poles are disposed opposite to each other about the axis of a rotary shaft. The relation between the total number of the teeth of the rotor and the total number of the small teeth of the stator segment is expressed by NS.gtoreq.0.8NR (NS being greater than or equal to 0.8NR). A difference between NR and NS is calculated from NR-NS=K(S0-S1)+10(S1-1+B) where K is an integer from 2 to 5, S0 and S1 are smallest possible integers or may be equal, and B is a fraction of 1 so that 10B is always an integer. Ten windings on their respective fixed magnetic poles are energized by a power supplying means to produce desired numbers of N and S poles. The full step angle is equal to an electric angle 90.degree.=aH=360.degree./10NR and thus, the half step angle is an electric angle 45.degree.=aH=360.degree./20NR. In action, the magnetization of the fixed magnetic poles at each step produces N and S poles of the same number. Also, one or more pairs of adjacent magnetic poles are polarized to S at each step.
REFERENCES:
patent: 3866104 (1975-02-01), Heine
patent: 4000452 (1976-12-01), Heine
patent: 4385247 (1983-05-01), Satomi
patent: 5374865 (1994-12-01), Yoshimura et al.
Yoshida Kenji
Yoshimura Noriyuki
Jones Judson H.
Minebea Co. Ltd.
Stephan Steven L.
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