Motor having index detection mechanism used for disc apparatus a

Details Motor having index detection mechanism used for disc apparatus a Motor having index detection mechanism used for disc apparatus a

1992-05-15

1993-09-14

Stephan, Stephen L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, 310268, 360 9807, H02K 714, H02K 1100, H02K 122, G11B 1708

Patent

active

052452352

ABSTRACT:
A spindle motor able to reduce leaking of magnetic flux of an index magnet to a magnetic head of a disc apparatus. In an axial gap type spindle motor having a rotor case rotatably supported by a base plate, an index magnet is provided to a face of the rotor case opposite to the base plate. A hall device is provided in an open space between a plurality of coils arranged radially on the base plate at a position opposite to the index magnet. A magnetic flux forms a closed loop by passing through the rotor case, and thus leaking of magnetic flux to the outside is reduced.

REFERENCES:
patent: 4556829 (1985-12-01), von der Heide
patent: 4818907 (1989-04-01), Shirotori
patent: 4980587 (1990-12-01), Yonei et al.
patent: 4992688 (1991-02-01), Cap et al.
patent: 5001581 (1991-03-01), Elsasser et al.
patent: 5006943 (1991-04-01), Elsasser et al.
patent: 5047677 (1991-09-01), Mineta et al.
patent: 5124863 (1992-06-01), Koizumi et al.

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