Design of Sliding Mode Controller for Voice Coil Motor Using Nonlinear Observer

Document Type : Power Article

Authors

1 Electrical and Computer Engineering Faculty, Hakim Sabzevari University, Sabzevar, Iran.

2 Faculty of Electrical and Computer Engineering, Hakim Sabzevari University, Sabzevar, Iran.

Abstract

Voice coil motors (VCM) are used in very small equipment such as mobile phone cameras and the use of a robust control feature as sliding mode control (SMC) is inevitable in them. The most important property of SMC is its invariant against matched disturbances and uncertainties which is due to the using of Sign function in input control signal. The invariant property is stronger than robustness. But, this method is not invariant with respect to the mismatched uncertainties i.e. is variant and sensitive. This is the challenge of SMC in VCM because of existents mismatched uncertainty in their models. To solve this problem in this paper, input control signal is calculated at first via SMC and then, coefficients of the sliding surface are determined in such a way that the effect of mismatched uncertainties or disturbances is removed in closed loop system and invariant property is retained. The proposed approach is simple in concept and realization. Moreover, due to the inaccessible system states, a new nonlinear observer is proposed for system model identification. In simulation, the electro-mechanical model of motor has been used which has both matched and mismatched uncertainties. Simulation results show the effectiveness of this approach.

Keywords

References

 
 
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Journal of Modeling in Engineering
Volume 19, Issue 66
September 2021
Pages 131-140

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History

  • Receive Date: 26 February 2021
  • Revise Date: 12 May 2021
  • Accept Date: 29 May 2021

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