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Sensorless Control of Induction Motor Drives Equipped With Inverter Output Filter

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3 Author(s)
Salomaki, J. ; Power Electron. Lab., Helsinki Univ. of Technol., Espoo ; Hinkkanen, M. ; Luomi, J.

This paper deals with the speed sensorless vector control of an induction motor in a special case where the output voltage of the pulsewidth-modulated inverter is filtered by an inductance-capacitance (LC) filter. The system states are estimated by means of an adaptive full-order observer, and no additional voltage, current, or speed measurements are needed. The rotor speed adaptation is based on the estimation error of the inverter output current. Quasi-steady-state and linearization analyses are used to design an observer that enables a wide operation region, including very low and very high speeds. A torque-maximizing control method is applied in the field-weakening region. Simulation and experimental results show that the performance is comparable to that of a drive without the LC filter

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Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 4 )