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Analysis of torsional torques in starting of large squirrel cage induction motors

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1 Author(s)
Shaltout, A.A. ; Dept. of Electr. Eng., Jordan Univ. of Sci. & Technol., Irbid, Jordan

The paper presents a comprehensive study of the starting process of a large squirrel cage induction motor driving an inertia load through an elastic shaft. The analysis of the electromagnetic torque of the motor has revealed that there are variable frequency components which interact with the torsional mode of the mechanical system and produce hazardous shaft torque. This torque may exceed the maximum yield of the shaft or it may accumulate and result in a cyclic fatigue fracture. The nature of the problem is explained and the factors which aggravate its impact are discussed. Furthermore, it is shown that the torsional torque can be substantially reduced by the proper coordination of the switching operations

Published in:

Energy Conversion, IEEE Transactions on  (Volume:9 ,  Issue: 1 )

Date of Publication:

Mar 1994

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