Patent ID: 6750784
Filing Date: 2004-06-15
Classification: G08C

Abstract:
A method of providing an analog electrical signal indicative of the position of a moving object comprising:(a) disposing a magnet for movement with the object; (b) disposing a stationary sensor in a position to be proximate the moving object and electrically exciting the sensor with substantially constant direct current voltage; (c) generating a sine wave voltage signal and a cosine wave signal with the sensor as the object is moved with respect to the sensor; (d) inputting said sine and cosine signal to an amplifier means and multiplexer means and outputting a voltage signal with said sensor according to the following table, where &thgr; represents the instantaneous included angle of rotation of the magnet relative to a reference: &THgr;Vâ€‚â€ƒâ€‚â€‰0-22.5Â°â€‚â€‰â€‚A SIN2&THgr; + K1â€‚22.5Â°-67.5Â°â€‚âˆ’B COS2&THgr; + K2â€‚67.5Â°-112.5Â°â€‰âˆ’A SIN2&THgr; + K3112.5Â°-157.5Â°â€‚B COS2&THgr; + K4157.5Â°-180Â°â€‚â€‰â€‰â€‚A SIN2&THgr; + K1.