Electromagnetic force applying device
First Claim
1. An electromagnetic force applying device comprising a core formed of a first magnetic material and having an annular gap, a winding on the core for producing a substantially radial magnetic field in the gap and an annular armature formed of a second magnetic material and which is drawn into said gap by said field, said armature and said core each being entirely comprised of said first and second magnetic materials, respectively, having respectively different coefficients of thermal expansion.
0 Assignments
0 Petitions
Accused Products
Abstract
An electromagnetic force applying device comprises a core with an annular air gap, a coil for creating a radial magnetic field in the air gap and an armature ring movable axially in the air gap. The core and the ring are of different magnetic materials with different coefficients of thermal expansion so that the force applied to the ring when a given current flows through the coil varies with temperature.
3 Citations
2 Claims
- 1. An electromagnetic force applying device comprising a core formed of a first magnetic material and having an annular gap, a winding on the core for producing a substantially radial magnetic field in the gap and an annular armature formed of a second magnetic material and which is drawn into said gap by said field, said armature and said core each being entirely comprised of said first and second magnetic materials, respectively, having respectively different coefficients of thermal expansion.
Specification
-
- Resources
-
Current AssigneeLucas Aerospace Limited
-
Original AssigneeLucas Aerospace Limited
-
InventorsThomas, Alan, Heath, Ronald Alfred
-
Primary Examiner(s)Harris, G.
-
Application NumberUS05/527,309Time in Patent Office525 DaysField of Search336/30, 336/179, 335/217US Class Current335/217CPC Class CodesG01L 11/008 electrostatic or electromag...G01L 9/0033 Transmitting or indicating ...G01L 9/0038 using variations in capacit...H01F 7/13 characterised by pulling-fo...H01F 7/1638 Armatures not entering the ...
