13th European Conference on Power Electronics and Applications, 2009. EPE '09

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Research Title: 
Low Speed Sensorless Control of An Induction Motor Fed by Multilevel Converter to Reduce Current Distortion
Authors: 
G AO , Q
Authors: 
T OMASINI , M.
Authors: 
ASHER, G.
Authors: 
SUMNER, M.
Authors: 
SALEH, K.
Date: 
Tue, 2009-09-08
Research Abstract: 
The paper introduces a new scheme to track the rotor position of an induction motor. The scheme uses the measurement of current derivatives during null switching vectors of a standard PWM scheme and reduces the minimum pulse widths required to allow high frequency switching oscillations to die down. The motor current distortion is therefore also reduced. The method uses H-Bridges connected in series with the main converter. This configuration has the same characteristics as the multilevel converters proposed for high power induction motor drives. The H-Bridges can be used to produce low voltage test vectors during the null vector which can provide a good rotor position estimation with very low additional current distortion. The paper will present experimental results which show the potential capability for sensorless speed control.