专利名称：Velocity sensor which senses differential
velocity by sensing changes in magnetic flux
发明人：Rand H. Hulsing, II申请号：US08/073829申请日：19930608公开号：US05469052A公开日：19951121
摘要：The invention comprises a velocity sensor (10, 30, 50, 60, 70, 110) that measuresvelocity in only one degree of freedom and is insensitive to the other five degrees offreedom. The velocity sensor uses differential flux splitting, and by sensing changes influx, common mode effects are removed. In practicing the invention, a permanent magnet(17, 33, 55, 65, 71, 131) is used to create a flux field, and multiple return paths are used tosplit 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 differentiallyvarying the amount of flux carried by each return path (13-14, 34-36, 52-53, 63-64, 73A-Cand 75A-C, 115-117), 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 maymove relative to the other a limited extent in directions not parallel to the sensitive axiswithout effecting a change in the net overlapped area, and the coils are arranged inseries-connected, oppositely wound pairs so that common mode error signals arecancelled.
申请人：ALLIEDSIGNAL INC.
代理人：Howard G. Massung
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