Brushless motor

Details Brushless motor Brushless motor

2008-07-17

2010-02-23

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156470, C310S216074

Reexamination Certificate

active

07667364

ABSTRACT:
A brushless motor includes a stator and a rotor. The stator includes an annular stator core having teeth arranged with a spacing in a circumferential direction of the annular stator core; and coils wound around the teeth respectively. The rotor includes a rotor core and magnetic poles of segment magnets arranged annularly along a circumferential direction of the rotor core. The segment magnets are stacked at a plurality of stages in an axial direction of the rotor core. A length direction of each of the segment magnets is parallel with the axial direction of the rotor core. The following expression is satisfied:in-line-formulae description="In-line Formulae" end="lead"?(2×β/P)+θ<(360/P)in-line-formulae description="In-line Formulae" end="tail"?where P is the number of the magnetic poles of the segment magnets at each stage, β (electrical angle) is the effective pole angular aperture on the outer peripheral surface of the rotor core, and θ is the skew angle equivalent to a phase shift angle between the corresponding magnetic poles of the segment magnets at the adjacent stages.

REFERENCES:
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patent: 2006/0197402 (2006-09-01), Gomyo et al.
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patent: 2007/0273241 (2007-11-01), Niguchi et al.
patent: 2008/0073995 (2008-03-01), Niguchi et al.
patent: 2008/0218023 (2008-09-01), Niguchi et al.
patent: 2008/0224559 (2008-09-01), Niguchi
patent: 2001-359266 (2001-12-01), None
U.S. Appl. No. 12/174,851, filed Jul. 17, 2008, Niguchi, et al.

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