Electricity: measuring and testing – Magnetic – Permanent magnet testing
Patent
1991-03-22
1992-10-13
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Permanent magnet testing
324262, G01R 3302, G01R 3312, G01N 2772
Patent
active
051554330
ABSTRACT:
A bipolar magnet as used in magnetic disk drives is characterized by measuring field strength of the magnet along a plurality of radii using a Hall effect sensor which is incrementally indexed across the magnet by a stepper motor. The gap field strength, pole transitions, and null zone can be determined from combinations of the measurements along the plurality of radii.
REFERENCES:
patent: 4465975 (1984-08-01), Porter
Allen, III Earl B.
Bobek Charles T.
Kaczeus Steven L.
Conner Peripherals, Inc.
Snow Walter E.
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