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Indirect Measurement of a Bar Magnet Position Using a Hall Sensor Array

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2 Author(s)
Marschner, U. ; Semicond. & Microsyst. Technol. Lab., Technische Univ. Dresden ; Fischer, W.

The measured magnetic induction field of a bar magnet can be used to compute or measure indirectly the position of the magnet. A model-based parameter estimation approach requires a precise induction field model and knowledge of the model error. In this paper, different analytic models describing the axial component of the induction field in front of a small cylindrical bar magnet are compared with Hall sensor array measurements and finite-element simulations. The used solenoid model matched the finite-element method simulations but requires a high numerical effort. The approximate dipole model is suitable when a proposed correction function for the estimated distance is applied and current and position are estimated simultaneously

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )