Brushless DC motor

Details Brushless DC motor Brushless DC motor

2008-09-02

2008-09-02

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

11229552

ABSTRACT:
A brushless DC motor prevents disconnection of a magnetic flux and to minimize leakage of the magnetic flux, thereby reducing torque ripple. A plurality of magnetic flux-disconnection preventing holes are arranged in an outer periphery of a rotor core between installing holes into which magnets are fitted. The plurality of magnetic flux-disconnection preventing holes are symmetrical at both sides about a first line connecting a center of the rotor core to a center between the adjacent installing holes, and an angle between the first line and a second line connecting the center of the rotor core to an outermost end of the plurality of magnetic flux-disconnection preventing holes is about 15˜20°. A length between an outer periphery of the rotor core and an outer periphery of the plurality of magnetic flux-disconnection preventing holes is smaller than a gap between the rotor core and the stator.

REFERENCES:
patent: 4658165 (1987-04-01), Vanderschaeghe
patent: 5672926 (1997-09-01), Brandes et al.
patent: 7105971 (2006-09-01), Asai et al.
patent: 2006/0145556 (2006-07-01), Aota et al.
patent: 2002-84693 (2002-03-01), None
patent: 2004104962 (2004-04-01), None

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