Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-06-12
1999-08-24
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, 310268, H02K 122
Patent
active
059428325
ABSTRACT:
A movable member of the present driving device comprises a magnetized part, or more than one magnetized parts having all the same direction of magnetization, which is perpendicular to the direction of movement. Each magnetized part is moving in at least two air-gaps of a closed magnetic circuit coupled with en energizing coil. The material of the magnetized parts has a linear demagnetization characteristic up to temperatures at least equal to 100.degree. C. and at least up to a negative value of the flux density equal, in absolute value, to 0.5 times the remanence of the magnetic material. The driving device is dimensioned so that the mean operating point of each magnetized part lies at a flux density value smaller than 0.5 times the value of the remanence of the magnetic material used. The volume of magnetic material can be substantially reduced for a given force or torque to be delivered.
REFERENCES:
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patent: 4910422 (1990-03-01), Brinkmann et al.
patent: 5053667 (1991-10-01), Oudet
patent: 5298825 (1994-03-01), Oudet et al.
patent: 5334893 (1994-08-01), Oudet et al.
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Browning Clifford W.
Dougherty Thomas M.
MMT S.A.
Mullins B.
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