Two-phase unipolar drive type brushless DC motor

Details Two-phase unipolar drive type brushless DC motor Two-phase unipolar drive type brushless DC motor

1997-03-03

1998-07-07

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 2112

Patent

active

057774153

ABSTRACT:
A two-phase unipolar drive type brushless DC motor has an armature including a stator yoke with salient poles around which coils are wound, and a rotor having a retainer with a rotor magnet which faces the armature at a predetermined small interval defined between the rotor magnet and the armature. The retainer is made of a polymeric material containing magnetic powder and formed integral with a rotor magnet. The rotor magnet is made of a highly efficient magnetic material or a rare earth magnetic material and consists of segment type permanent magnet pieces which are arranged circumferentially in the retainer. The motor is manufactured at a low cost and provides a stable magnetic wave form which can be used as a spindle motor in various kinds of memory apparatuses.

REFERENCES:
patent: 3299335 (1967-01-01), Wessels
patent: 4859887 (1989-08-01), Carlsson et al.
patent: 5254895 (1993-10-01), Koizumi
patent: 5530307 (1996-06-01), Horst
patent: 5581140 (1996-12-01), Futami et al.
patent: 5596238 (1997-01-01), Milnikel
patent: 5610457 (1997-03-01), Kurita
patent: 5637945 (1997-06-01), Yamamuro et al.
patent: 5682073 (1997-10-01), Mizuno
Patent Abstracts of Japan, vol. 007, No. 136 (E-181), 14 Jun., 1983 & JP 58-051764 A (Matsushita Denki Sangyo KK), 26 Mar., 1983--Abstract.
Patent Abstracts of Japan, vol. 007, No. 222 (E-201), 4 Oct., 1983 & JP 58-112450 (Kokusan Denki KK), 4 Jul., 1983--Abstract.

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