Thomas J Devaney

US Patent:

7135792, Nov 14, 2006

Filed:

May 11, 2005

Appl. No.:

11/127469

Inventors:

Thomas J. Devaney - Watchung NJ, US
Chun Li - Plainview NY, US

Assignee:

Dexter Magnetic Technologies, Inc. - Fremont CA

International Classification:

H02K 41/00

US Classification:

310 12

Abstract:

An embodiment of the invention is a particular arrangement of permanent magnets that generates a higher strength and more uniform magnetic field than existing permanent magnet arrangements for a voice coil motor. The permanent magnet arrangement of an embodiment is based on the Halbach arrangement of permanent magnets. The increased magnetic field strength and uniformity allows for a voice coil motor that is both capable of higher frequency actuations as well as more uniform force over the full stroke of the actuation.

US Patent:

59595205, Sep 28, 1999

Filed:

Aug 21, 1998

Appl. No.:

9/137568

Inventors:

Richard E. Stelter - Fremont CA
David Choit - Dix Hills NY
Thomas J. Devaney - Watchung NJ

Assignee:

Dexter Magnetic Technologies, Inc. - Fremont CA

International Classification:

H01F 702

US Classification:

335306

Abstract:

An improved magnetic decoupler with a magnetic field shape, strength and gradient optimized for releasing security tags, such as an antitheft device of the type described above. Due to the structure of the magnetic decoupler, it contains less ferrous material than prior art decouplers heretofore employed. Reduction in size of the magnetic decoupler, along with improved magnetic strength, derive from the magnet assembly including magnets arranged with orientations in quadrature to increase axial magnetic field gradient within the decoupler cavity by superposition of the magnetic fields of each magnet.

US Patent:

60844981, Jul 4, 2000

Filed:

Apr 7, 1999

Appl. No.:

9/287944

Inventors:

Richard E. Stelter - Livermore CA
David Choit - Dix Hills NY
Thomas J. Devaney - Watchung NJ

Assignee:

Dexter Magnetic Technologies, Inc. - Fremont CA

International Classification:

H01F 702
H01F 704

US Classification:

335306

Abstract:

An improved magnetic decoupler with a magnetic field shape, strength and gradient optimized for releasing security tags, such as an antitheft device of the type described above. Due to the structure of the magnetic decoupler, it contains less ferrous material than prior art decouplers heretofore employed. Reduction in size of the magnetic decoupler, along with improved magnetic strength, derive from the magnet assembly including magnets arranged with orientations that increase axial magnetic field gradient by superposition of the magnetic fields of each magnet.

US Patent:

20180019653, Jan 18, 2018

Filed:

Jun 23, 2017

Appl. No.:

15/631490

Inventors:

- Devens MA, US
Baris Yagci - Whippany NJ, US
David Schlatter - Arlington Heights IL, US
Thomas Devaney - Watchung NJ, US

International Classification:

H02K 41/03
H02K 41/02

Abstract:

A mover for a linear motor system includes a magnet subassembly. The mover includes a magnetic structure disposed on at least one side of the magnet subassembly and creating with the magnetic subassembly a resultant magnetic field. The magnetic structure being centered on a detected center of the resultant magnetic field. The mover includes a body structure mounted on or with reference to the magnetic structure to position a physical center of the body structure at approximately the detected center of the resultant magnetic field.