Motor with recess for index position detection

Details Motor with recess for index position detection Motor with recess for index position detection

1995-02-13

1997-08-05

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310261, H02K 1100

Patent

active

056546009

ABSTRACT:
The invention relates to a motor, and more particularly to a motor having means for detecting an index position. A rotor yoke of the motor is provided with a recess having a width greater than the width of each pole of a rotating magnet. Substantially the whole of one pole of the rotating magnet and a part of another pole adjacent to the one pole on the downstream side in terms of rotation of a rotor are exposed to the recess. The magnetic flux from the magnet exposed to the recess is detected by a Hall element disposed in opposition to the outer circumference of the rotor, thereby specifying the index position.

REFERENCES:
patent: 3831071 (1974-08-01), Mitsu
patent: 4364005 (1982-12-01), Kohzai et al.
patent: 5095238 (1992-03-01), Suzuki et al.
patent: 5233296 (1993-08-01), Maeda et al.
patent: 5319271 (1994-06-01), Shimada et al.

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