Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2007-12-11
2007-12-11
Patidar, Jay M (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S207250
Reexamination Certificate
active
10367459
ABSTRACT:
A contactless rotary shaft position sensor provides for precision computation of shaft angle for a wide range of input shaft rotational angles. The sensor includes two annular two-pole magnets which are connected by a precision, motion-transmitting gear train. An optional second gear train between one of the magnets and the input shaft can provide additional angular rotation scaling to accurately measure either fractional or a large number of multiple turns of the input shaft. The gear ratios are selected such that one of the magnets does not rotate more than one revolution. Pairs of ratiometric Hall-effect or magnetoresistive sensors provide differential voltage signals which are used for sensing angular position of each magnet over a full 360 degrees of rotation. The single-turn magnet provides an absolute, coarse indication of input shaft rotation with a typical accuracy of 2%. The gear ratio between the magnets produces several turns of the second magnet for each turn of the single-turn magnet. Since the gear ratio between the magnets is fixed, the angle sensed for the multi-turn magnet can be predicted from the position of the single-turn magnet. This is compared to the multi-turn magnet's actual sensed rotation. The result is an improvement in accuracy directly proportional to the gear ratio between the magnets. Computation of the individual magnet rotation angles and the input shaft angle is performed using a microprocessor and appropriate signal conditioning circuits. Utilizing two magnets, input shaft rotation can be accurately measured to within 0.1% of maximum range.
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ESP@CENET (European Patent Office), Abstract of DE 19820014, http://v3.espacenet.com.
ESP@CENET (European Patent Office), English Translation of Description of DE 19820014, http://v3.espacenet.com.
ESP@CENET (European Patent Office), English Translation of Claims of DE 19820014, http://v3.espacenet.com.
Burandt Wesley
Frederick Gary L.
Seger Eric
Steuer Andrew
BVR Technologies Co.
Frantz Keith
Patidar Jay M
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