Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnetostrictive-type device
Patent
1986-06-02
1989-07-04
Tarcza, Thomas H.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnetostrictive-type device
310 26, H01H 5500
Patent
active
048454508
ABSTRACT:
The drive modules of a magnetostrictive transducer are fabricated from interleaved permanent magnet disks (samarium cobalt) and high-strain, low-permeability magnetostrictive lanthanide alloy (Terfenol-D) disks to form a stack of such interleaved materials of substantially uniform magnetic field distribution in the stack. Two such stacks in side-by-side relationship provide a series-aiding magnetic circuit completed through high-permeability flux return pole pieces at their ends thereby providing a substantially uniform magnetic field distribution in the stack. Each stack has longitudinally-extending and electrically-insulated planar cuts and each flux return pole piece is a laminate of thin sheets of high-permeability electrically-insulated steel to reduce eddy current losses resulting from the AC field. The steel sheets are constrained by a nonmagnetic end-block into which the steel sheets are inserted and bonded.
REFERENCES:
patent: 2930911 (1960-03-01), Halliday et al.
patent: 3484630 (1969-12-01), Schwartz
patent: 4104549 (1978-08-01), Akimoto et al.
patent: 4151432 (1979-04-01), Akimoto et al.
Harrold William J.
Porzio Raymond
Sturges James R.
Raytheon Company
Santa Martin M.
Sharkansky Richard M.
Sotomayor John B.
Tarcza Thomas H.
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