access icon free Analysis of a tunnelling magneto-resistance-based angle transducer

An angle transducer that utilises tunnelling magneto-resistance (TMR) type sensor elements is presented and its performance is analysed. The signal conditioning circuit of the proposed angle transducer translates the sine-cosine outputs of a TMR sensor integrated circuit into an output that varies linearly with the sensing angle. An added advantage of the proposed scheme is that the output of the angle sensor is dictated, apart from the angle being sensed, only by a dc reference voltage. Thus good performance characteristics can be obtained from the proposed transducer very easily by using a precision dc voltage as the reference. Possible sources of errors that may affect the performance of the transducer are identified and their effects are quantified. Simulation studies conducted using SPICE demonstrates the ability of the scheme in providing a linear output across the entire 360° range. Experimental results obtained from a prototype unit built and tested, portray a worst-case error of < ±1.05%.

Inspec keywords: tunnelling magnetoresistance; angular measurement; magnetoresistive devices; transducers; signal conditioning circuits; magnetic sensors

Other keywords: signal conditioning circuit; sine-cosine outputs; tunnelling magnetoresistance-based angle transducer analysis; SPICE; dc reference voltage; TMR type sensor elements; precision dc voltage; TMR sensor integrated circuit

Subjects: Magneto-acoustic, magnetoresistive, magnetostrictive and magnetostatic wave devices; Sensing devices and transducers; Spatial variables measurement

References

    1. 1)
      • 17. Hill, E.W.: ‘Modelling of magnetoresistive micro-sensors’. Proc. IEE Sem. Microengineering, Modelling and Design (Ref. No. 1999/052), London, 4 March 1999, pp. 7/17/4.
    2. 2)
    3. 3)
      • 33. Anoop, C.S., George, B., Kumar, V.J.: ‘Tunneling magneto-resistor based angle transducer’. Proc. IEEE Int. Conf. Sens. Tech., Palmerston North, New Zealand, December 2011, pp. 451455.
    4. 4)
      • 15. ‘Magnetoresistive angle sensor systems’, http://www.nxp.com/documents/brochure/75016147.pdf, accessed December 2013.
    5. 5)
      • 3. http://www.nxp.com/documents/data_sheet/X3G_T_OH047_048.pdf, accessed July 2013.
    6. 6)
      • 4. Zhang, X.D., Kang, L.Y., Diao, W.F.: ‘The principle of the potentiometer and its applications in the vehicle steering’. Proc. Int. Conf. Vehicular Electronics and Safety Shaan' xi, China, October 2005, pp. 2024.
    7. 7)
    8. 8)
      • 25. Bienczyk, K.: ‘Angle measurement using a miniature Hall effect position sensor’. Proc. IEEE Electrodynamic and Mechatronics, Opole, Poland, May 2009, pp. 2122.
    9. 9)
      • 22. ‘AA and AB-Series Analog Sensors’, http://www.nve.com/Downloads/apps.pdf, accessed December 2012.
    10. 10)
      • 11. Kim, K.C.: ‘Analysis on the characteristics of variable reluctance resolver considering uneven magnetic fields’, IEEE Trans. Magn., 2013, 49, (7), pp. 38513854.
    11. 11)
      • 23. ‘Engineering Evaluation Kit for Angle Sensing using the GMW360ASM Angle Sensing Module’, http://www.gmw.com/magnetic_sensors/sentron/2sa/GMW360ASM_Acc.html, accessed December 2013.
    12. 12)
      • 28. Medrano, N., Zatorre, G., Celma, S., Sanz, M.T.: ‘A digitally tunable analogue conditioning circuit for angular position sensors’. Proc. Int. Carib. Conf. Dev. Cir. Syst., Playa del Carmen, Mexico, April 2006, pp. 281286.
    13. 13)
      • 2. http://www.ssec.honeywell.com/position-sensors/datasheets/sae.pdf, accessed July 2013.
    14. 14)
    15. 15)
    16. 16)
    17. 17)
    18. 18)
      • 10. Brasseur, G.: ‘Robust automotive sensors’. Proc. Int. Conf. IEEE Instrum. Meas., Ottawa, Canada, May 1997, pp. 127883.
    19. 19)
      • 42. ‘AS5045 Rotary Sensor’, http://www.ams.com/eng/Products/Position-Sensors/Rotary-Magnetic-Position-Sensors/AS5045.
    20. 20)
    21. 21)
      • 39. Sahadevan, A.M., Gopinadhan, K., Bhatia, C.S., Yang, H.: ‘Parallel-leaky capacitance equivalent circuit model for MgO magnetic tunnel junctions’, Appl. Phys. Lett., 2012, 101, pp. 162404-1162404-15.
    22. 22)
      • 30. Kapser, K., Weinberger, M., Granig, W., Slama, P.: ‘GMR sensors in automotive applications’, in Valldorf, J., Gessner, W. (Eds.): ‘Giant Magnetoresistance (GMR) Sensors from Basis to State-of-the-Art Applications’ (Springer Link, 2013), pp. 133156.
    23. 23)
    24. 24)
      • 1. Prosser, S.J.: ‘Automotive sensors: past, present and future’. J. Phys. Conf. Ser. Sensors 07, Liverpool, UK, 2007, pp. 012001/1012001/6.
    25. 25)
    26. 26)
    27. 27)
    28. 28)
    29. 29)
      • 24. Farley, B.: ‘A mixed signal sensor interface IC for angle measurement’. IEE Colloq. Systems on a Chip (Ref. No. 1999/133), Belfield, Ireland, September 16, pp. 19.
    30. 30)
    31. 31)
      • 38. Chang, Y., Li, K., Huang, H., Tung, M., Tong, S.: ‘Extraction of the tunnel magnetocapacitance with two-terminal measurements’, J. Appl. Phys., 2010, 107, (9), pp. 093904-1093904-4.
    32. 32)
      • 40. Parkin, S., Yang, H., Yang, S.-H., Hayashi, M.: ‘Magnetic tunnel junctions’, in Kronmueller, H., Parkin, S. (Eds.): ‘Handbook of Magnetism and Advanced Magnetic Materials’ (John Wiley & Sons, Ltd., 2007), pp. 25802590.
    33. 33)
      • 21. ‘AAT001-10E TMR Angle Sensor’, http://www.nve.com/Downloads/AAT001.pdf, accessed December 2013.
    34. 34)
      • 41. ‘MMA253F Dual-Axis TMR Angle Sensor’, http://www.dowaytech.com/en/e/action/ListInfo/?classid=8/, accessed December 2013.
    35. 35)
    36. 36)
      • 31. Burke, J., Moyhihan, J.F., Unterkofler, K.: ‘Extraction of high resolution position information from sinusoidal encoders’. Proc. Int. PCIM, Nürnberg, Germany, June 2000, pp. 217222.
    37. 37)
      • 34. Anoop, C.S., George, B., Kumar, V.J.: ‘A linear tunneling magneto-resistance angle transducer’. Proc. IEEE Instrum. Meas. Tech. Conf., Graz, Austria, May 2012, pp. 20732077.
    38. 38)
      • 29. Granig, W., Hammerschmidt, D., Bernhard, S.: ‘Integrated gigant magnetic resistance based angle sensor’. Proc. IEEE Sensors, Daegu, Korea, October 2006, pp. 542545.
    39. 39)
    40. 40)
    41. 41)
      • 37. http://www.freqdev.com/products/osc/d45q.pdf, June 2013.
    42. 42)
    43. 43)
      • 14. Witschnig, H., Morici, A., Schaffer, B., Zimmer, J.: ‘A fully monolithic integrated anisotropic magnetoresistance based angle sensor for automotive’. Proc. Int. Conf. IEEE Transducers & Eurosensors XXVII, Barcelona, Spain, June 2013, pp. 22572260.
    44. 44)
      • 43. ‘Melexis MLX90360 Triaxis Position Sensor IC’, http://www.melexis.com/Hall-Effect-Sensor-ICs/Triaxis%C2%AE-Hall-ICs/MLX90360-758.aspx.
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