Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1991-09-27
1993-05-04
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Linear
310 22, 310 24, 310156, H02K 4100
Patent
active
052084981
ABSTRACT:
A linear actuator comprises a shaft made of non-magnetic material for being reciprocatingly moved in an axial direction of the shaft, a plurality of ring-shaped moving cores which are located on the shaft and arranged in the axial direction thereof, and each of which is made of magnetic material, a first spacer made of non-magnetic material and interposed between two adjacent moving cores, a plurality of ring-shaped permanent magnets each of which is disposed on one of the respective ring-shaped moving cores and each of which includes a plurality of magnets arranged in the circumferential direction in such a manner that adjacent magnets are different in polarity, and a stationary core located around each of the permanent magnets with a clearance. The stationary core is formed with an outer ring portion formed, magnetic poles which face the permanent magnets, and legs which connect the outer ring portion and the magnetic poles. Coils are wound around the legs. The moving cores and the stationary core are formed of a plurality of thin plates laminated to one another and made of magnetic material. The number of stationary cores in the axial direction of the shaft is smaller than the number of permanent magnets by one, and the polarity of the permanent magnets are formed in the radial direction of the shaft.
REFERENCES:
patent: 4349757 (1982-09-01), Bhate
patent: 4785210 (1988-11-01), Maruyama
patent: 4810914 (1989-03-01), Karidis
patent: 4924123 (1990-05-01), Hamajima
Aisien Seiki Kabushiki Kaisha
Skudy R.
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