Brushless DC motor

Details Brushless DC motor Brushless DC motor

1997-11-06

1999-09-14

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310152, 310257, H02K 3700

Patent

active

059527609

ABSTRACT:
A brushless DC motor, whose stator (10) is a combination of stator yokes (11, 16), a bobbin (14) on which a magnetic field coil (15) is wound and to which terminal pins are provided, and a base plate (20). The stator (10) is fixed to the base plate (20) by a protrusion (12c) provided on the bobbin (14) or by a flange (18a) formed on a bearing. The widths of magnetic poles (11a, 16a) of the stator, which are measured in the circumferential direction of the stator, are smaller than the width of one of the poles of a rotor magnet (5). Thereby, the position of a stable point is a maximum excitation torque position. Further, a magnetic pole sensing element (21) is provided at a place which is shifted in the circumferential direction from the middle position of one of the magnetic poles of the rotor magnet (5).

REFERENCES:
patent: 4501981 (1985-02-01), Hansen
patent: 4891567 (1990-01-01), Fujitani et al.
patent: 4899075 (1990-02-01), Hasebe
patent: 4973866 (1990-11-01), Wang
patent: 5043613 (1991-08-01), Kurata et al.

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