Method for calibrating an angular position sensor

Details Method for calibrating an angular position sensor Method for calibrating an angular position sensor

1996-04-16

1997-07-01

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Calibration

3242072, G01R 3500, G01B 730

Patent

active

056442254

ABSTRACT:
A method is provided to calibrate an angular position sensor by using an electrical coil to provide a magnetic field that simulates the presence of a permanent magnet. By successively selecting currents to flow through the electrical coil and by moving the electrical coil through at least two angular positions, the gain of an output relationship between a signal from a magnetically sensitive component and the angular position of the coil can be determined. By changing the intensity of the electrical current flowing through the coil, the intensity of the magnetic field emanating from the coil can be selected. In order to achieve the appropriate null offset characteristic of the device, the electrical coil is moved until a preselected output voltage is achieved. By comparing the angular position of the coil when the output voltage is achieved to an angular position of the coil for the desired output signal characteristic, a calibration angle can be determined. A ferromagnetic object is then magnetized with a magnetic field of the determined intensity and at an angle equal to the calibration angle.

REFERENCES:
patent: 4782293 (1988-11-01), Steingroever et al.
patent: 5164668 (1992-11-01), Alfors
patent: 5332965 (1994-07-01), Wolf et al.
patent: 5500589 (1996-03-01), Sumcad

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