Influence of the structure of electrical machine rotor for the stator deformations during operation

This paper presents the results of tests on an induction machine with a squirrel cage rotor (classic design) and on a machine with a rotor having permanent magnets in addition to the cage - a synchronized induction machine with an immediate start capability. In both cases, the stator was the same. The research related to stator deformations generated during a normal operation of the machine operating at idle, loaded with a torque equal to the moment of inertia of the tested rotor and loaded with rated torque. Natural frequencies of the stator were previously determined. They were determined both experimentally and computationally. The deformations of the machine were determined for the most representative frequencies, taking into account natural stator frequencies.