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.     

Conference Title

13th European Conference on Power Electronics and Applications

Conference Country

Spain

Conference Date

Sept. 8, 2009 - Sept. 10, 2009

Conference Sponsor

IEEE

Additional Info

Conference Website