Low stress magnet interface

Details Low stress magnet interface Low stress magnet interface

1994-10-03

1996-09-17

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Temperature compensator

7351423, G01P 1513

Patent

active

055570445

ABSTRACT:
A force rebalance accelerometer includes a proof mass suspended by one or more flexures between stationary mounted upper and lower excitation rings. Pick-off capacitance plates formed on opposing sides of the proof mass form capacitance elements whose capacitance varies in response to displacement of the proof mass to provide a displacement signal. The displacement signal is applied to one or more electromagnets, used to force the proof mass back to a null or at-rest position. The drive current applied to the electromagnets thus represents the force or acceleration applied to the accelerometer. The electromagnets include a magnet and a pole piece which forms a magnetic return path. In order to relieve stresses due to thermal expansion, the magnet is spaced apart from the pole piece to enable the bonding area to be constrained to a minimum which, in turn, reduces the overall stress on the accelerometer. In particular, a bead of relatively noncompliant epoxy is used for bonding the excitation ring and pole piece to the magnet. In order to further reduce thermal stresses, a ring of relatively compliant epoxy is disposed concentric to the noncompliant epoxy.

REFERENCES:
patent: 4182187 (1980-01-01), Hanson
patent: 4250757 (1981-02-01), Hanson
patent: 4394405 (1983-07-01), Atherton
patent: 4399700 (1983-08-01), Hanson
patent: 4400979 (1983-08-01), Hanson et al.
patent: 4441366 (1984-04-01), Hanson
patent: 4555944 (1985-12-01), Hanson et al.
patent: 4555945 (1985-12-01), Hanson
patent: 4592234 (1986-06-01), Norling
patent: 4620442 (1986-11-01), MacGugan et al.
patent: 4697455 (1987-10-01), Norling
patent: 4726228 (1988-02-01), Norling
patent: 4932258 (1990-06-01), Norling
patent: 4944184 (1990-07-01), Blake et al.
patent: 5024089 (1991-06-01), Norling
patent: 5085079 (1992-02-01), Holdren et al.
patent: 5090243 (1992-02-01), Holdren et al.
patent: 5097172 (1992-03-01), Becka
patent: 5111694 (1992-05-01), Foote
patent: 5182949 (1993-02-01), Rupnick et al.
patent: 5203210 (1993-04-01), Terry et al.
patent: 5212984 (1993-05-01), Norling et al.
patent: 5220831 (1993-06-01), Lee

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