Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1997-05-05
1998-09-29
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Linear
310105, 310 23, 310 17, 335100, 335179, 335236, H02K 4100
Patent
active
058149074
ABSTRACT:
The invention is directed to an improved electromagnetic force motor (10) with internal eddy current damping. In the preferred embodiment, the motor is comprised of a body (11), a pair of permanent magnets (15.sub.L, 15.sub.R), an electromagnetic coil (20), and an armature (13). The armature is positioned with respect to the body so as to define two variable-reluctance working air gaps (30, 31) and a constant-reluctance non-working air gap (29). The permanent magnets face one another and are mounted on the body. The body and armature are both adapted to conduct magnetic flux. Each working air gap contains a magnetic flux that is the algebraic sum of a flux attributable to the permanent magnets and a flux attributable to the coil. The non-working air gap contains flux attributable only to the permanent magnets. A current-conducting member (14) is attached to the armature and positioned within the non-working air gap. The current-conducting member moves linearly in the non-working air gap in a direction substantially perpendicular to the flux therein such that eddy currents are induced in the member. The elements of the motor are configured such that the eddy currents are a function of the velocity of the armature relative to the body, but are not a function of changes in the flux either attributable to the coil or attributable to the position of the armature. The eddy currents provide damping of armature velocity, and result in an electromagnetic force motor with improved dynamic performance and greater stability.
REFERENCES:
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patent: 5054587 (1991-10-01), Matsui et al.
patent: 5365210 (1994-11-01), Hines
patent: 5389910 (1995-02-01), Abel
Dougherty Thomas M.
Moog Inc.
Mullins B.
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