DocumentCode :
3261328
Title :
On the detection of missing magnetic wedges using impedance analysis
Author :
Orman, Maciej ; Ottewill, James R. ; Tkaczyk, Agnieszka ; Pinto, Claudio ; Anand, Vishal
Author_Institution :
Mechatron. Dept., ABB Corp. Res. Center, Shanghai, China
fYear :
2013
fDate :
6-8 Dec. 2013
Firstpage :
325
Lastpage :
330
Abstract :
In this paper, a method for detecting missing magnetic wedges in induction motors supplied both direct-online and via variable-speed-drive is presented. The proposed algorithm is based on spectrum analysis of an impedance calculated using measured stator current and voltage signals. The main idea of proposed algorithm is to first normalize current and voltage signals in order to remove variations due to non-stationary operating conditions. Once normalized, the signals are processed to obtain the frequency spectrum of the impedance for each power phase and, subsequently, specific differences between phases are analyzed to identify faults. To verify these algorithms three induction motor cases were examined. Two were supplied direct-on-line and one supplied by variable-speed-drives. In the case of direct-online-supply one of the motors was known to be healthy and the other was known to have missing magnetic wedges while in the case of variable-speed-drive-supply one motor was known to have missing magnetic wedges. Measurements were recorded and processed using an ABB portable condition monitoring tool dedicated for electric motors. Experimental investigations show that the method successfully identifies defective cases.
Keywords :
induction motor drives; signal processing; stators; variable speed drives; ABB portable condition monitoring tool; current signals; direct-online-supply; electric motors; impedance analysis; induction motors; missing magnetic wedges detection; nonstationary operating conditions; spectrum analysis; stator current; variable-speed-drives; voltage signals; Current measurement; Impedance; Induction motors; Magnetic domains; Time-frequency analysis; Voltage measurement; direct torque control; impedance analysis; induction machine; magnetic wedges;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Condition Assessment Techniques in Electrical Systems (CATCON), 2013 IEEE 1st International Conference on
Conference_Location :
Kolkata
Print_ISBN :
978-1-4799-0081-7
Type :
conf
DOI :
10.1109/CATCON.2013.6737521
Filename :
6737521
Link To Document :
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