Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-09-01
1996-11-12
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 10, 310156, H02K 709
Patent
active
055743226
ABSTRACT:
A motor has a rotor mounted on a stator to rotate about a rotation axis. The rotor is driven due to the interaction of a drive coil on the stator and a permanent magnet on the rotor. A magnetic thrust bearing, having permanent magnets on the stator and rotor, applies a radial thrust force. The radially outer surface of the permanent magnet on the rotor abuts a part of the rotor, so as to resist forces on the permanent magnet at high speed rotation or due to thermal deformation. The permanent magnets on the stator and the rotor may be axially offset by an offset of not more than 1/4 the axial length of the permanent magnets, or the axial length of the longer of the permanent magnets if they have different axial lengths. This generates an axial thrust at the thrust bearing, which counteracts the attractive force between the permanent magnet and the drive coil, and also the weight of the rotor.
REFERENCES:
patent: 5010563 (1991-04-01), Laurent
patent: 5043615 (1991-08-01), Oshima
patent: 5117448 (1992-05-01), Penato
patent: 5254966 (1993-10-01), Solar
patent: 5325006 (1994-06-01), Uno
patent: 5402023 (1995-03-01), Nakanishi
Akashi Sueo
Hashimoto Ichiro
Nakajima Takeshi
Nii Katsutoshi
Uno Satosi
Dougherty Thomas M.
Enad Elvin G.
Hitachi , Ltd.
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