Laminated rotor core for mounting permanent ring magnets

Details Laminated rotor core for mounting permanent ring magnets Laminated rotor core for mounting permanent ring magnets

1995-11-02

1998-03-24

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, 310 52, 310 61, 310216, 310261, 310264, 310265, 310156, H02K 2112

Patent

active

057316481

ABSTRACT:
One aspect of the invention is a rotor core for use with a permanent ring magnet in an electric motor which serves to minimize and evenly distribute thermal stresses in the rotor without undermining the efficiency of the motor by distorting the flux return to the ring magnet. According to one embodiment, the rotor core comprises a plurality of laminated plates. Each of the plates has a rim with a circular outer perimeter, a hub concentric with the outer perimeter of the rim, and first and second sets of curved spokes coupling the hub to the rim. Each spoke of the first set of curved spokes is concave in a clockwise direction and each spoke of the second set of curved spokes is concave in a counter-clockwise direction. According to another embodiment, the rotor core comprises a plurality of laminated structurally-identical perforated plates having obverse and reverse sides such that the obverse side of each plate faces the obverse side of an adjacent plate. In an especially preferred form, the plates include a plurality of arcuate perforations symmetrically distributed about a central axis of the rotor core. Adjacent arcuate perforations define arcuate spokes which support the magnet ring.

REFERENCES:
patent: 3258623 (1966-06-01), Phelon et al.
patent: 3323763 (1967-06-01), Butts
patent: 3802068 (1974-04-01), Scott
patent: 4594525 (1986-06-01), Stokes
patent: 4642502 (1987-02-01), Carpenter et al.
patent: 5047680 (1991-09-01), Torok
patent: 5402024 (1995-03-01), Watanabe et al.
patent: 5402025 (1995-03-01), Saito et al.

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