Accelerometer having lateral pole piece biasing elements

Details Accelerometer having lateral pole piece biasing elements Accelerometer having lateral pole piece biasing elements

1997-03-24

1999-03-16

Friedhofer, Michael A.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6153, H01H 3514

Patent

active

058833471

ABSTRACT:
An accelerometer (10) features a housing (12) having an passage (14) of rectangular cross-section formed therein, and one embodiment the width dimension gradually increases with increasing displacement along a central longitudinal axis (16) away from a first end (24) of the passage. A puck-shaped magnetic sensing mass (26) is located within the passage and oriented so that its magnetic axis extends in a direction normal to a basal surface (18) of the passage. A pair of magnetically-permeable pole pieces (22) extend from a coil (21) parallel to the passage (14) to magnetically-interact with the sensing mass so as to bias the sensing mass towards a first position within the passage. A pair of electrically-conductive nonmagnetic plates (32) on the housing magnetically interact with the sensing mass to damp the movement thereof within the passage. The coil (21) provides both test and reconfiguration functions.

REFERENCES:
patent: 3774128 (1973-11-01), Orlando
patent: 5012050 (1991-04-01), Sewell
patent: 5028750 (1991-07-01), Spies et al.
patent: 5149925 (1992-09-01), Behr et al.
patent: 5614700 (1997-03-01), Moss et al.

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