2026-09-21T17:30:00Zhttps://api.repository.cam.ac.uk/server/oai/requestoai:www.repository.cam.ac.uk:1810/2448012024-06-26T13:39:54Zcom_1810_213729com_1810_256065col_1810_219485
Calculation of Unbalanced Magnetic Pull in Cage Induction Machines
10.17863/CAM.14044
Dorrell, David George
If the rotor of an induction motor is not concentric with the stator then an electromagnetic
force is generated in a direction that will increase the eccentricity. This is called unbalanced magnetic pull (UMP).
The first part of the work presented in this dissertation develops theoretical models
which allow the calculation of the UMP in cage induction motors due to static rotor
eccentricity. These account for any winding configuration including parallel stator
winding connection.
The second part of the work verifies the models experimentally using two different
cage induction motors. The agreement between predicted and measured values of
UMP and line current is found to be good. The investigation leads to several new
aspects of the damping effects of parallel stator windings and the cage rotor being
highlighted.
University of Cambridge
1993-10-26
Thesis
Doctoral
Doctor of Philosophy (PhD)
en
Science and Engineering Research Council
GEC Alsthom Large Machine Ltd., Rugby
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Electrical Machines
Induction Motors
Asynchronous Machines
Unbalanced Magnetic Pull