Abstract
An adaptive digital demodulation method for a sinusoidal encoder signal is proposed for fast and accurate analysis of spiral servo track writing (SSTW). The proposed methods combine adaptive signal correction and digital interpolation. In addition, digital phase-shifted sinusoid (PSS) interpolation is proposed in order to acquire precise position information. The adaptive signal correction method compensates for a fast-motion non-ideal encoder signal. The digital PSS can be simply implemented and can resolve the switching noise of conventional analog methods. The proposed adaptive digital demodulation scheme can be simply digitalized and can improve the position control in SSTW. From the simulation and experimental results, we have validated the proposed methods, which show noticeable improvement in terms of the Lissajous error and the position error signal.
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References
Analog Devices (2000) Closed-loop position estimation with signal compensation for sinusoidal encoders with the AMD401. Technical Report AN401-23, Analog Devices Inc
Balemi S (2005) Automatic calibration of sinusoidal encoder signals. In: Proceedings in the 16th IFAC WC, Prague
Benammar M, Ben-brahim L, Alhamadi MA, Al-Maemi M (2008) A novel method for estimating the angle from analog co-sinusoidal quadrature signals. Sens Actuators A Phys 142(1):225–231
Brunnett D, Hills M (1989) Method and apparatus for recording disk servo information with detachable position decoder. No. US4831470
Hagiwara N, SuzukiH Y, Murase H (1992) A method of improving the resolution and accuracy of rotary encoders using a code compensation technique. IEEE Trans Instrum Meas 41(1):98–101
Heydemann PLM (1981) Determination and correction of quadrature fringe measurement errors in interferometers. Appl Opt 20(19):3382–3384
Ito Y, Kanamori S, Mitamura M (2005) Encoder signal interpolation divider. No. US6950769
Kiriyama T, Teraguchi M (1999) Interpolation circuit for encoder having a look-up table memory with reduced capacity. No. US5999113
Lee T-S, Kang HJ, Lee CW, Chung CC (2009) Dual-rate iterative learning control for spiral servo track writing. In: ICCAS-SICE, Fukuoka, pp 3100–3105
Mamun AA, Guo G, Bi C (2007) Hard disk drive mechatronics and control. CRC Press
Staebler M (1998) TMS320F240 DSP-solution for high-resolution position with sin/cos encoder. Application Report SPRA496, Texax Instruments Inc
Swearingen PA, Shepherd SH (1997) System for self-servowritng a disk drive. No. US5668679
Venema S, Hannaford B (1995) Kalman filter based calibration of precision motor control. In: Proceedings of the IEEE international conference on intelligent robots and systems, PA, pp 224–229
Acknowledgments
This work was supported by National Research Foundation of Korea Grant funded by the Korean Government (2011-0000134) and (2011-0004743).
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Kang, H.J., Kim, S.H., Lee, SH. et al. Adaptive digital demodulation of sinusoidal encoder signal for positioning control of spiral servo track writing. Microsyst Technol 18, 1247–1253 (2012). https://doi.org/10.1007/s00542-012-1488-y
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DOI: https://doi.org/10.1007/s00542-012-1488-y