Title: High sensitivity magnetic actuator
Application Number: 86106267 Application Date: 1986.09.18
Publication Number: 1011269 Publication Date: 1987.05.27
Approval Pub. Date: 1996.10.16 Granted Pub. Date: 1996.10.16
International Classifi-cation: F16K31/08;G05D16/00
Applicant(s) Name: Rosemount Inc. (US) State of Minnesota, U.S.A. Address:
Inventor(s) Name: Gregory C. Brown
Attorney & Agent: FU KANG
Abstract:
    A magnetic actuator has a housing that supports a coil surrounding a central core, and includes a diaphragm type spring above the central core. A cover of high magnetic permeability is mounted on the housing spaced from the diaphragm spring . A permanent magnet is mounted on the diaphragm spring in a predetermined pole orientation and the magnet extends through an opening in the cover. The permanent magnet provides flux through the housing and the core. Sensitivity is increased by using the permanent magnet. The magnet is oriented in relation to current flow in the coil so that the flux from the magnet will add to that generated by the coil in the gap between the pole face formed by the core and the spring and will subtract from the flux generated by the coil in the gap between the spring and the cover to provide a substantially linear deflection versus current relationship.
Time: 7
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