Herbert E Malsky

US Patent:

51793083, Jan 12, 1993

Filed:

Jan 14, 1992

Appl. No.:

7/820341

Inventors:

Herbert Malsky - Belmont MA

Assignee:

Charles Stark Draper Laboratory, Inc. - Cambridge MA

International Classification:

H02K 709

US Classification:

310 905

Abstract:

Antifriction bearings include circumferential as well as axial flux paths that the flux of four identical-polarity magnetic poles follows about an annular stator having annular end-pieces that enables a square law reduction in rotor eddy current effects over the heretofore known magnetic bearings. In one embodiment, control coils alone provide magnetic suspension along orthogonal X, Y axes, and in another embodiment, combination control and bias coils cooperate to provide magnetic suspension along the orthogonal X, Y axes. The stator and rotor are preferably constituted, in part, of a lamination of high magnetic permeability material.

US Patent:

46459618, Feb 24, 1987

Filed:

Apr 5, 1983

Appl. No.:

6/482180

Inventors:

Herbert Malsky - Belmont MA

Assignee:

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

International Classification:

H02K 2114

US Classification:

310156

Abstract:

A dynamoelectric machine having a large magnetic gap and flexible printed circuit phase windings includes a multi-pole samarium cobalt magnet assembly consisting of radially aligned magnets and circumferentially positioned interpole magnets attached to a soft iron ring for providing radially directed magnetic poles of alternating polarity, and a printed circuit winding assembly attached to a soft back iron sleeve for providing electromagnetic poles. The printed circuit winding assembly comprises a lamination of selectively aligned and interconnected printed circuit phase windings, each having serially connected printed circuit coils of the same phase. The winding and magnet assemblies are separated by a small mechanical gap to allow their relative rotation. The magnets and soft iron structures are proportioned to operate near the maximum energy product condition for Samarium Cobalt, where the sum of the mechanical gap thickness and the winding assembly thickness is the magnetic gap in a high reluctance circuit. A large volume of windings is placed within the permanent magnet field and entirely within the magnetic gap to provide a large ampere-turn condition at a low power dissipation.