1982-09-08
1984-09-25
Skudy, R.
Cutlery
104281, 104284, F16C 3906
Patent
active
044732597
ABSTRACT:
A magnetic bearing for supporting in suspension a linear armature member (20) includes an elongated cylindrical housing (18) having two sets of U-shaped stationary electromagnets (10.sub.1, 12.sub.1, 14.sub.1, 16.sub.1 and 10.sub.2, 12.sub.2, 14.sub.2, 16.sub.2) and position sensors (48.sub.1, 50.sub.1 and 48.sub.2, 50.sub.2) respectively located at each end of the housing (18). Each set of electromagnets preferably consists of four electromagnet assemblies (10, 12, 14, 16) located 90.degree. apart around the periphery of the housing (18) and are operable to generate four orthogonal magnetic fields (30) within the housing (18). Each set of position sensors (48, 50) are aligned with the electromagnets (10 and 12) to define two orthogonal horizontal (X) and vertical (Y) axes from which signals proportional to orthogonal shaft displacement are provided. These signals are fed to four separate circuit means (126, 132, 138, 140, 150), two for each X and Y axis which are adapted to provide signals proportional to shaft positional displacement and velocity within the housing which are utilized to generate respective control signals of the proper amplitude and direction to energize the coil windings (32.sub.1, 34.sub.1, 36.sub.1, 38.sub.1 and 32.sub.2, 34.sub.2, 36.sub.2, 38.sub.2) for radially centering the shaft (20) within the housing (18) while maintaining a predetermined stiffness and dampening characteristic. The armature 20 is composed of a magnetic material, at least in the vicinity of the two sets of electromagnets and sufficiently beyond, so as to provide support for the armature throughout its distance of linear, axial travel. The remainder of the armature may be reduced in diameter or of lightweight material. A bumper magnet assembly (106), comprising an axially magnetized magnet (108) situated between a pair of magnets (112, 114), is included for positioning, axially moving or dampening axial displacement of the armature member (20).
REFERENCES:
patent: 396792 (1889-01-01), Williams
patent: 1020942 (1912-03-01), Bachelet
patent: 3702208 (1972-11-01), Habermann
patent: 3707924 (1973-01-01), Barthalon
patent: 4012083 (1977-03-01), Habermann
patent: 4180946 (1980-01-01), Heijkenskjold
Skudy R.
The United States of America as represented by the Administrator
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