Magnetic bearing and an assembly comprising a stator portion and

Details Magnetic bearing and an assembly comprising a stator portion and Magnetic bearing and an assembly comprising a stator portion and

1995-01-18

1997-11-11

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 90, 84123, 417420, 417423, 417352, H02K 709

Patent

active

056867727

ABSTRACT:
The bearing has a fixed portion, and a moving portion, and includes a passive magnetic abutment composed of a fixed element secured to said fixed portion, and of a moving element secured to said moving portion. The bearing further including a passive magnetic centering bearing which is coaxial with said passive abutment, and which is composed of a fixed element secured to the fixed portion, and of a moving element secured to the moving portion, the passive abutment externally surrounding the passive centering bearing, the passive abutment having axial stiffness k.sub.ab, radial stiffness k.sub.rb, a mean radius R.sub.mb, and an inside radius R.sub.ib, and said passive centering bearing having axial stiffness k.sub.ac, radial stiffness k.sub.rc, a mean radius R.sub.mc, and an outside radius R.sub.ec, an air gap e separating the fixed element of said abutment from the moving element thereof and separating the fixed element of the centering bearing from the moving element thereof, these parameters being chosen so as to satisfy the following three relationships simultaneously:

REFERENCES:
patent: 4620752 (1986-11-01), Fremerey et al.
patent: 4717315 (1988-01-01), Miki et al.
patent: 4787829 (1988-11-01), Miyazaki et al.
patent: 5117448 (1992-05-01), Penato et al.
patent: 5152679 (1992-10-01), Kanemitsu et al.
patent: 5166566 (1992-11-01), Bernhardt et al.
patent: 5350283 (1994-09-01), Nakazeki et al.
Patent Abstracts of Japan, vol. 9, No. 235 (M-415)(1958) 21 Sep. 1985 & JP-A-60 091 011 (Rigaku Keisoku) 22 May 1985.
French Search Report FR 9400537.

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