Miniature crossed coil gauge having an active flux ring
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United States of America Patent
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-
Nov 11, 1997
Grant Date -
N/A
app pub date -
Oct 26, 1995
filing date -
May 17, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A miniature crossed coil gauge is provided having an oriented rare earth magnet fixedly mounted on a rotary shaft for supplying a magnetic flux directed transverse to the shaft axis. The gauge housing provided by an upper and lower bobbin surrounds the magnet and supports the rotary shaft. A first and second coil are wound about the gauge housing in a crossed coil orientation encircling the magnet. A flux ring is disposed around the first and second coils axially aligned with respect to the magnet. The magnet has sufficient strength and the flux ring is mounted in sufficiently close proximity to the first and second coils to redistribute the flux supplied by the magnet so that the magnetic flux measured at the surface of the coils is substantially increased relative to the magnetic flux density measured with the flux ring removed. This gauge construction facilitates the fabrication of gauges so small that they can be directly mounted on printed circuit boards using conventional electronic component mounting equipment.
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