Brushless motor

Details Brushless motor Brushless motor

1990-03-23

1991-09-03

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 310 68B, 310 91, 310194, 310208, 310254, 310DIG6, H02K 2112

Patent

active

050457403

ABSTRACT:
A brushless motor comprising: a rotor constituted by a permanent magnet having a plurality of circumferentially alternately equally magnetized N and S magnetic poles; a stator having a plurality of excitation coils equidistantly disposed around the rotor; a rotor position detecting member such as a magneto-sensitive element; and a printed circuit board having a commutation circuit for switching the electric current for the excitation coils based on a detection signal of the rotor position detecting member; wherein the number of the magnetic poles of the rotor is selected so that the number of the magnetic poles of the rotor located within an area between respective center lines of two adjacent excitation coils is an odd number not smaller than three. The width of each excitation coil is selected so that an angle .alpha. formed between lines connecting the circumferential opposite ends of each excitation coil commonly to a center of the rotor is made equal to an angle .beta. formed between lines connecting the circumferential opposite ends of each magnetic pole of the rotor commonly to the center of the rotor.

REFERENCES:
patent: 3831071 (1974-08-01), Mitsui
patent: 3867656 (1975-02-01), Mitsui
patent: 4553075 (1985-11-01), Brown et al.
patent: 4724350 (1988-02-01), Shiraki et al.
patent: 4728833 (1988-03-01), Shiraki et al.
patent: 4733119 (1988-03-01), Shiraki et al.

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