Calculation of radial forces in cage induction motors at startthe effect of rotor differential

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Journal Article
IEEE Transactions on Magnetics, 2010, 46 (8), pp. 3029 - 3032
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In this paper, the radial forces in an induction motor are calculated using finite element analysis. These radial forces (or unbalanced magnetic pull-UMP) are generated when the rotor is eccentric. The work illustrates the importance of higher winding harmonics and rotor differential leakage in the starting UMP. Examples of a 6 pole machine with 26 and 40 bar rotors show that increasing the bar number and air-gap length will reduce the UMP. Further studies are carried out using parameter variation and a 10-pole machine is also addressed, where experimental results exist, in order to validate the calculation. © 2006 IEEE.
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