Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-02-17
2000-05-16
LaBelle, Clayton
Electrical generator or motor structure
Dynamoelectric
Rotary
310268, 310 68B, H02K 112, H02K 122, H02K 1100
Patent
active
060641339
ABSTRACT:
A stator assembly operated in a 2-phase drive manner including first and second stator coils wound in a star shape with a plurality of projections and a plurality of grooves, and arranged with a predetermined phase difference; and an annular supporting body into which the first and second stator coils are inserted for supporting the coils, insulating them from each other. Each stator coil includes four projections and four grooves, and there is a phase difference .theta. between the first and second stator coils, the difference determined by the following equation: .theta.=360/2P.+-.360/P, wherein P denotes the number of a rotor's magnetic poles. A brushless direct-current motor operated in a 2-phase drive manner includes a stator having first and second stator coils wound in a star shape with a plurality of projections and a plurality of grooves, and arranged with a predetermined phase difference; a shaft rotatably supported on a case; at least one disk-shaped multi-pole rotor supported by the shaft with an air gap from the stator in an axial direction; first and second location sensors provided to the stator with the same phase difference as that of the first and second stator coils for detecting the rotor's magnetic pole; and a driving control circuit driving the first and second stator coils in response to the detection of the magnetic pole of the rotor by the first and second location sensors, wherein said phase difference is determined by the equation: .theta.=360/2P.+-.360/P (P=the number of a rotor's magnetic poles).
REFERENCES:
patent: Re31278 (1983-06-01), Schmider
patent: 3375386 (1968-03-01), Hayner et al.
patent: 4093897 (1978-06-01), Fujita et al.
patent: 4242608 (1980-12-01), Ishigaki et al.
patent: 4260920 (1981-04-01), Nakamura et al.
patent: 4324994 (1982-04-01), Hager
patent: 4902923 (1990-02-01), Okauchi
Kim Byung-kyu
Kim Joon
Amotron Co., Ltd.
LaBelle Clayton
Yuyu Co., Ltd.
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