Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1991-02-08
1993-09-07
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420722, G01P 348, G01P 354
Patent
active
052432785
ABSTRACT:
The invention comprises a velocity sensor (10, 30, 50, 60, 70, 110) that measures velocity in only one degree of freedom and is insensitive to the other five degrees of freedom. The velocity sensor uses differential flux splitting, and by sensing changes in flux, common mode effects are removed. In practising the invention, a permanent magnet (17, 33, 55, 65, 71, 131) is used to create a flux field, and multiple return paths are used to split the flux. A plurality of pole pieces (20-21, 39-40, 58-59, 66-67, 72-73, 111-112) simultaneously move an equal amount in relation to the return paths for differentially varying the amount of flux carried by each return path (13-14, 34-36, 52-53, 63-64, 73A-C and 75A-C, to thereby induce a differential voltage in secondary coils (15-16, 37-38, 56-57, 68-69, 80-83 and 90-93, 140-143 and 150-153). Detection means (not shown) is used to sense the change in voltage and provide an indication of the sensed velocity. The pole pieces and return paths are overlapped by an amount to ensure that one may move relative to the other a limited extent in directions not parallel to the sensitive axis without effecting a change in the net overlapped area, and the coils are arranged in series-connected, oppositely wound pairs so that common mode error signals are cancelled.
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Harry E. Burke Handbook of Magnetic Phenomena Van Nostrand Reinhold Co., New York 1986 p. 232.
Snow Walter E.
Sundstrand Corporation
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