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

M. SONNAILLON; G. BISHEIMER; C. DE ANGELO; J. SOLSONA; G. GARCÍA

IEE PROCEEDINGS ON ELETRIC POWER APPLICATIONS

IET (former IEE)

Año: 2006 vol. 153 p. 815 - 822

1350-2352

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 feld-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.