Title :
Sensorless control of induction Machines at zero and low frequency using zero sequence currents
Author :
Staines, C. Spiteri ; CARUANA, Cedric ; Asher, Greg M. ; Sumner, Mark
Author_Institution :
Fac. of Electr. Eng., Univ. of Malta, Msida, Malta
Abstract :
This paper considers both flux and rotor position estimations for sensorless control of delta-connected cage induction machines (IMs) at low and zero frequency operation. The variation of leakage inductance due to either saturation or rotor slotting is tracked by measuring the derivative of the zero sequence current in response to the application of appropriate voltage test vectors. The method requires only a single extra sensor. It requires access to machine phase windings and is appropriate for integrated-type induction motor drives. Both a closed-slot and an open-slot machine is used to demonstrate rotor flux and rotor position tracking, respectively. Experimental results are presented showing sensorless torque control and sensorless speed and position control at low and zero frequencies.
Keywords :
angular velocity control; electric current measurement; induction motor drives; machine control; machine windings; position control; rotors; torque control; closed-slot machine; delta-connected cage induction machines; flux estimation; induction machine; induction motor drives; leakage inductance; machine phase winding; open-slot machine; position control; rotor position estimation; rotor position tracking; rotor slotting saliency; saturation saliency; sensorless control; sensorless speed control; sensorless torque control; zero sequence current; Current measurement; Frequency estimation; Inductance measurement; Induction machines; Induction motor drives; Machine windings; Rotors; Sensorless control; Testing; Voltage; Induction machine; position estimation; rotor slotting saliency; saturation saliency; sensorless control; zero sequence current;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2005.862295