[KSCI] Korea Science Citation Index Service

Ultra Precise Position Estimation of Servomotor using Analog Quadrature Encoder

Kim Ju-Chan (Dept. of Electrical Engineering, Pusan National University)
Hwang Seon-Hwan (Dept. of Electrical Engineering, Pusan National University)
Kim Jang-Mok (Dept. of Electrical Engineering, Pusan National University)
Kim Cheul-U (Dept. of Electrical Engineering, Pusan National University)
Choi Cheol (OTIS.LG Motor Division Servo Team)

Publication Information

Journal of Power Electronics / v.6, no.2, 2006 , pp. 139-145 More about this Journal

Abstract

This paper describes the ultra precise position estimation of a servomotor using a sinusoidal encoder based on Arcsine Interpolation Method for the cost reduction of circuit design. The amplitude and offset errors of the sinusoidal encoder output signals, from the encoder itself and analog signal processing procedures, are effectively compensated and on-line tuned by utilizing a low cost programmable differential amplifier without any special expensive equipment. For a theoretical evaluation of the practical resolution of this system, the relationship between the amplitude of ADC(Analog to Digital Converter) input signal errors and the anticipated resolution is also addressed. The performance of the proposed method is verified by comparing it with speed control characteristics of the servomotor driving system using a digital incremental 50,000ppr encoder in the experiments.

Keywords

sinusoidal encoder; interpolation; position estimation; analog rotor position; digital rotor position;

Citations & Related Records

Reference

1	Heidenhain, Heidenhain General Catalog, 2003
2	O.Benzaid and B.M.bird, Interpolation techniques for incremental encoders, Proc. 23rd Int. Intelligent Motion Conf., June 22-24, 165-172, 1993
3	C.Yien, 'Incremental encoder errors: Causes and ways to reduce them,' in Proc. PCIM'92, Nuremberg, Germany, Apr. 1992, pp. 110-121
4	J.R.R.Mayer, 'High-resolution of rotary encoder analog quadrature signals', IEEE Trans. Instrum. Meas. 43(3), pp. 494-498 1994 DOI ScienceOn
5	Ramon Pallas-Areny, Sensors and Signal Conditioning, Wiley interscience, pp. 433-444, 2000
6	W. Leonhard, 'Control of Electrical Drives, pp. 345-354,'2nd Edition, Springer, 1996
7	N. Hagiwara, Y. Suzuki, and H.Murse, 'A method of improving the resolution and accuracy of rotary encoders using a code compensation technique,' IEEE Trans, Instrum. Meas, 41(1), pp. 98-101, 1992 DOI ScienceOn
8	R.C.Kavanagh. 'Probabilistic learning technique for improved accuracy of sinusoidal encoders', IEEE Trans. Ind. Electron. Vol.48. no.3. pp673-681. June 2001 DOI ScienceOn
9	K.K. Tan, Huixing X.Zhou, and Tong Heng Lee, 'New Interpolation Method for Quadrature Encoder Signals,' IEEE Trans. Instrum and Meas. Vol.51. no.5. 2002
10	John G. Webster, The measurement, instrumentation, sensors handbook, CRC Press, pp.6.98-6.119, 19999