Driven rotary shaft system using permanent magnets

Details Driven rotary shaft system using permanent magnets Driven rotary shaft system using permanent magnets

1987-10-02

1989-01-03

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310218, 310261, H02K 2114

Patent

active

047959363

ABSTRACT:
A driven rotary shaft system has a rotor including a core with a generally cylindrical surface, made from a stack of circular laminates of magnetic material which are clamped together in alignment. Permanent magnets are mounted in aligned windows formed in each laminate near diametrically opposed pole pieces for providing at least a pair of magnetic fields in positions which interact with magnetic fields of an adjacent stator. The permanent magnets and the windows have an arcuate cross section generally corresponding to the contours of the generally cylindrical surface. At least a pair of opposed air gaps are formed on diametrically opposed sides of the core, and between said pole pieces. These air gaps have internal concave contours which follow, correspond, and conform to the contours of flux lines produced by said permanent magnets. In one embodiment, the air gaps are completely within the perimeter of the circular laminates. The portions of the cylindrical surface which are between the air gaps form the pole pieces for said rotor. The portions over the air gaps form an aerodynamically smooth shape, containing a limited amount of the laminate material in order to limit magnetic flux therein.

REFERENCES:
patent: 3394295 (1968-07-01), Cory
patent: 3471725 (1969-10-01), Moret et al.
patent: 3991332 (1976-11-01), Kawamura
patent: 4110646 (1978-08-01), Rao
patent: 4486679 (1984-12-01), Jones
Jeumont-Schneider, "High Power Adjustable Drive with Synchronous Motor", Power Conversion International, Sep.-Oct. 1979, pp. 83-94.

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