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Mechanical-sensorless induction motor drive based only on dc-link measurements

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5 Author(s)
M. O. Sonnaillon ; Fac. de Ingenieria, UNRC, Rio Cuarto ; G. Bisheimer ; C. De Angelo ; J. Solsona
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Sensor count reduction for high-performance induction motor (IM) drives is considered. A novel strategy to compute the three phase currents, based on a single current sensor and an adaptive observer, is proposed. The observer estimates the motor state variables, allowing then implementing an IM field-oriented controlled (FOC) drive with closed speed loop based only on DC-link measurements. To demonstrate the practical feasibility of this proposal, representative experimental results, obtained with a FOC experimental prototype, are presented. The FOC prototype showed results similar to those from a conventional FOC drive with individual phase current sensors. The sensor count reduction achieved represents a significant cost diminution in the implementation of low-power high-performance drives

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IEE Proceedings - Electric Power Applications  (Volume:153 ,  Issue: 6 )