Electricity: measuring and testing – Magnetic – Displacement
Patent
1996-01-31
1997-10-28
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Displacement
32420716, 336115, G01B 714, G01B 730
Patent
active
056820976
ABSTRACT:
An electromagnetic actuator with position sensor includes a core made of a soft magnetic material, a permanent magnet located adjacent the core for providing a magnetic field in the core and an electrically conductive drive coil wrapped about a first portion of the core. The drive coil is supported such that the drive coil can move along the first portion of the core. An electrically conductive sense coil is wrapped about a second portion of the core and fixed relative to the core such that there is substantially no relative movement between the sense coil and the core. When an electrical current is passed through the drive coil, the drive coil moves along the first portion of the core and an electrical current is induced in the sense coil which indicates the position of the drive coil relative to the first portion of the core.
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Bryant Robert Cooper
Lee J. Kelly
O'Brien Michael Joseph
Eastman Kodak Company
Howley David A.
O'Shea Sandra L.
Patidar Jay M.
Snee, III Charles E.
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