Power and temperature independent magnetic position sensor for a

Details Power and temperature independent magnetic position sensor for a Power and temperature independent magnetic position sensor for a

1986-12-22

1988-05-24

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324225, G01B 730

Patent

active

047468599

ABSTRACT:
In order to optimize the electrical performance in motors in terms of improved efficiency, power factor, and reduced current, a power and temperature magnetic position sensor for a rotor utilizes first and second magnetic sensing devices for accurately determining the angular position of the rotor. The first and second magnetic sensing devices include at least one target operatively associated with the rotor so as to rotate therewith, a first sensor disposed at a variable distance from the target dependent upon the angular position of the rotor to define a first air gap therebetween, and a second sensor disposed at a variable distance from the target dependent upon the angular position of the rotor to define a second air gap therebetween. The first and second sensors cooperate with the target to detect magnetic field intensity in the first and second air gaps, respectively, and produce output signals indicative of the magnetic field intensity which, at any point in time, is dependent upon the length of the first and second air gaps as determined by the position of the first and second sensors relative to the target at that point in time. The first and second sensors are also operatively associated with a compensating circuit which includes an electronic adder for adding the output signals produced by the first and second sensors, an electronic subtractor for subtracting the output signals produced by the first and second sensors, and an electronic divider for dividing the added output signals by the subtracted output signals. Since the output signals change in magnitude in a manner indicative of the magnetic field intensity by reason of changes in the length of the first and second air gaps, the electronic divider produces a numerical value representative of the accurate angular position of the rotor which is independent of power supply and temperature variations.

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