Brushless motor having a field magnet, a portion of which is use

Details Brushless motor having a field magnet, a portion of which is use Brushless motor having a field magnet, a portion of which is use

1996-10-21

1998-04-28

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, 310156, 310DIG3, H02K 2122

Patent

active

057448949

ABSTRACT:
A brushless motor is provided. The brushless motor of the present invention includes a shaft, a rotor, having a plurality of field magnets attached thereto, fixed to the shaft, a stator for forming a magnetic field to enable rotation of the rotor, a housing in which the rotor and stator are installed, and a motor driving unit, wherein the arc length of a portion of the field magnet used for detecting the position of the rotor and that of the remaining portion thereof are formed to be different from each other.
According to the brushless motor of the present invention, it is possible to increase efficiency of the brushless motor and to reduce manufacturing costs.

REFERENCES:
patent: 4130769 (1978-12-01), Karube
patent: 4562399 (1985-12-01), Fisher
patent: 4737647 (1988-04-01), Miyao
patent: 4893040 (1990-01-01), Turner et al.
patent: 5038065 (1991-08-01), Matsubayashi et al.
patent: 5053664 (1991-10-01), Kikuta et al.
patent: 5095238 (1992-03-01), Suzuki et al.

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