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Higher signal and lower noise levels are obtainable, and limited space requirements are met by reorienting magnet, shunt, and coil requirements of a sensor.
English (United States)
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Higher signal and lower noise levels are obtainable, and limited space
requirements are met by reorienting magnet, shunt, and coil requirements of a
One prior embodiment utilized for gear tooth sensing is shown in Fig. 1. A
gear 1 having teeth 2 is located adjacent the end of a coil 3. The remainder of
the sensor is made up of shunt 4 and magnet 5. The magnetic flux paths are
denoted by reference numeral 6. With this arrangement, a large amount of
space is required and the obtainable flux density results in a low signal level and
a marginal signal-to-noise ratio. Also, the length of the flux paths renders the
sensor overly sensitive to external magnetic fields.
A sensor providing a solution to the above-mentioned problem is illustrated in
Fig. 2. Shunt 4 is L-shaped, and magnet 5 is mounted between the base 7 of
shunt 4 and the side of gear 1. Magnet 5 can be positioned very close to gear 1
for reducing the length of the flux paths 6 to obtain higher signal levels or permit
the use of weaker magnets.
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