Sensorless control of induction Machines at zero and low frequency using zero sequence currents
Staines, C.S.
Caruana, C.
Asher, G.M.
Sumner, M.
Fac. of Electr. Eng., Univ. of Malta, Msida, Malta;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2006
Volume: 53,
Issue: 1
On page(s): 195- 206
ISSN: 0278-0046
INSPEC Accession Number: 8765378
Digital Object Identifier: 10.1109/TIE.2005.862295
Current Version Published: 2006-02-06
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.
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