© The Institution of Engineering and Technology
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%.
References
-
-
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. 7/1–7/4.
-
2)
-
6. Sheng, H.-J., Tsai, P.-T., Lee, W.-Y.: ‘Random rotary position sensor based on fiber Bragg gratings’, IEEE Sens. J., 2012, 12, (5), pp. 1436–1441 (doi: 10.1109/JSEN.2011.2173187).
-
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. 451–455.
-
4)
-
5)
-
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. 20–24.
-
7)
-
27. Schott, C., Racz, R., Huber, S.: ‘Novel analog magnetic angle sensor with linear output’, Sens. Actuators A, 2006, 132, pp. 165–170 (doi: 10.1016/j.sna.2006.03.032).
-
8)
-
25. Bienczyk, K.: ‘Angle measurement using a miniature Hall effect position sensor’. Proc. IEEE Electrodynamic and Mechatronics, Opole, Poland, May 2009, pp. 21–22.
-
9)
-
10)
-
11. Kim, K.C.: ‘Analysis on the characteristics of variable reluctance resolver considering uneven magnetic fields’, IEEE Trans. Magn., 2013, 49, (7), pp. 3851–3854.
-
11)
-
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. 281–286.
-
13)
-
14)
-
12. Zhang, Z., Ni, F., Dong, Y., Jin, M., Liu, H.: ‘A novel absolute angular position sensor based on electromagnetism’, Sens. Actuators A, Phys., 2013, 194, pp. 196–203 (doi: 10.1016/j.sna.2013.01.040).
-
15)
-
32. Lopez-Martin, A.J., Carlosena, A.: ‘A performance tradeoffs of three novel GMR contactless angle detectors’, IEEE Sens. J., 2009, 9, (3), pp. 191–198 (doi: 10.1109/JSEN.2008.2011086).
-
16)
-
7. Sauter, T., Nachtnebel, H., Kero, N.: ‘A smart capacitive angle sensor’, IEEE Trans. Ind. Inf., 2005, 1, (4), pp. 250–258 (doi: 10.1109/TII.2005.858425).
-
17)
-
8. Brasseur, G.: ‘Modeling of the front end of a new capacitive finger-type angular position sensor’, IEEE Trans. Instrum. Meas., 2001, 50, (1), pp. 111–116 (doi: 10.1109/19.903887).
-
18)
-
10. Brasseur, G.: ‘Robust automotive sensors’. Proc. Int. Conf. IEEE Instrum. Meas., Ottawa, Canada, May 1997, pp. 1278–83.
-
19)
-
20)
-
9. Cheng, P., Oelmann, B.: ‘Joint-angle measurement using accelerometers and gyroscopes – a survey’, IEEE Trans. Instrum. Meas., 2010, 59, (2), pp. 404–414 (doi: 10.1109/TIM.2009.2024367).
-
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. 162404-1–162404-15.
-
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. 133–156.
-
23)
-
S. Maheshwari
.
Analogue signal processing applications using a new circuit topology.
IET Circuits Devices Syst.
,
106 -
115
-
24)
-
1. Prosser, S.J.: ‘Automotive sensors: past, present and future’. J. Phys. Conf. Ser. Sensors 07, Liverpool, UK, 2007, pp. 012001/1–012001/6.
-
25)
-
44. Ausserlechner, U.: ‘Inaccuracies of giant magneto-resistive angle sensors due to assembly tolerances’, IEEE Trans. Magn., 2009, 45, (5), pp. 2165–2174 (doi: 10.1109/TMAG.2009.2013712).
-
26)
-
20. Inoue, J., Maekawa, S.: ‘Theory of tunneling magnetoresistance in granular magnetic films’, Phys. Rev. B, 1996, 53, (18), pp. R11927–929 (doi: 10.1103/PhysRevB.53.R11927).
-
27)
-
18. Arana, S., Arana, N., Gracia, F.J., Casta, E.: ‘High sensitivity linear position sensor developed using granular Ag–Co giant magnetoresistances’, Sens. Actuators A, 2005, 124, pp. 116–121 (doi: 10.1016/j.sna.2005.04.002).
-
28)
-
36. Filanovsky, I.M., Fortier, G.J.: ‘Fast amplitude control in twin-T bridge RC oscillators’, Electr. Lett., 1985, 21, (18), pp. 791–792 (doi: 10.1049/el:19850558).
-
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. 1–9.
-
30)
-
16. Ripka, P., Jano, M.: ‘Advances in magnetic field sensors’, IEEE Sens. J., 2010, 10, (6), pp. 1108–1116 (doi: 10.1109/JSEN.2010.2043429).
-
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. 093904-1–093904-4.
-
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. 2580–2590.
-
33)
-
34)
-
35)
-
5. Miller, C.A.: ‘Simplified optical fibre end cleave angle measurement device’, Electr. Lett., 1984, 20, (13), pp. 528–530 (doi: 10.1049/el:19840367).
-
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. 217–222.
-
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. 2073–2077.
-
38)
-
29. Granig, W., Hammerschmidt, D., Bernhard, S.: ‘Integrated gigant magnetic resistance based angle sensor’. Proc. IEEE Sensors, Daegu, Korea, October 2006, pp. 542–545.
-
39)
-
26. Lozanova, S., Roumenin, C.: ‘Physical angular position device with 2D low-noise Hall microsensor’, Sens. Actuators A, Phys., 2010, 162, (2), pp. 167–171 (doi: 10.1016/j.sna.2009.12.013).
-
40)
-
13. Drljaca, P.M., Kejik, P., Vincent, F., Piguet, D., Popovic, R.S.: ‘Low-power 2-D fully integrated CMOS fluxgate magnetometer’, IEEE Sens. J., 2005, 5, (5), pp. 909–915 (doi: 10.1109/JSEN.2004.840836).
-
41)
-
42)
-
19. Yang, H., Yang, S.-H., Parkin, S.S.P.: ‘Crossover from Kondo-assisted suppression to co-tunneling enhancement of tunneling magnetoresistance via ferromagnetic nanodots in MgO tunnel barriers’, Nanoletters, 2008, 8, (1), pp. 340–344 (doi: 10.1021/nl072930n).
-
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. 2257–2260.
-
44)
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