Parameter estimation scheme for low-speed linear induction motors having different leakage inductances
Gubae Kang
Junha Kim
Kwanghee Nam
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug. 2003
Volume: 50,
Issue: 4
On page(s): 708- 716
ISSN: 0278-0046
INSPEC Accession Number: 7708551
Digital Object Identifier: 10.1109/TIE.2003.814864
Current Version Published: 2003-07-28
Abstract
Linear induction motors (LIMs) are characterized by a large air gap and, as a result, large leakage inductances. Moreover, due to its unslotted structure and the absence of end rings in the secondary part, the primary leakage inductance is much larger than the secondary leakage inductance. Such differences prevent us from using parameter estimation methods developed for the rotary motors. We propose a parameter estimation scheme for a LIM that utilizes a pulsewidth-modulation inverter. It yields mutual inductance by numerically solving a third-order polynomial. Direct estimation of mutual inductance enables us to calculate the leakage inductances separately. The proposed estimation scheme is tested with various example models and with a real 20-kW single-sided LIM.
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