Amplitude to Phase Conversion Based on Analog Arcsine Synthesis for Sine-cosine Position Sensors

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Vol. 193, Issue 10, October 2015, pp. 114-122

Amplitude to Phase Conversion Based on Analog Arcsine Synthesis for Sine-cosine Position Sensors

^* Mohieddine BENAMMAR, Antonio Jr. GONZALES

College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar
^* Tel.: +974-4403-4203, fax: +974-4403-4201

^* E-mail: mbenammar@qu.edu.qa

Received: 31 August 2015 /Accepted: 5 October 2015 /Published: 30 October 2015

Abstract: Sinusoidal encoders, including Hall effect sensors, are position sensors that provide analog sine and cosine signals of angular position. All schemes used for converting these signals into measure of the angle require either trigonometric or inverse trigonometric function implementation. The proposed converter is based on the use of the alternating pseudo-linear segments of the sensor signals together with a simple and effective linearization technique. The theoretical absolute error of non-linearity of the converter is 0.05 degree over the full 360 degree range. The converter may be implemented numerically or electronically. The paper describes the proposed method, full details of its analog implementation, and experimental results obtained using both a computer-based sensor emulator and a Hall effect sensor. Results demonstrate agreement between theory and experimental results.

Keywords: Amplitude-phase conversion, Inverse sine synthesis, Linearization, Position measurement, Sinusoidal encoder, Hall effect sensor.

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