Analysis of Vibration Effects of Radial and Tangential Electromagnetic Force Harmonics in Submersible Induction Motors

In submersible induction motors the inner surface of the stator is subjected to radial and tangential electromagnetic forces, which can cause radial and tangential vibrations in the motor, resulting in noise.However,existing analysis rarely considers the influence of radial electromagnetic force on the vibration analysis of induction motors. In order to accurately analyze the contribution of radial and tangential electromagnetic forces to motor vibration. In this article, firstly, the analytical expressions for the air gap magnetic field and the tangential and radial components of electromagnetic force of an induction motor are derived. Then, using Maxwell's stress theory, the radial and tangential electromagnetic force densities generated on the stator teeth were obtained. Secondly, through finite element analysis and experimental modal testing, the modal vibration modes and frequency characteristics of the prototype were studied. Finally, through harmonic response simulation and experiment, the contribution of radial and tangential electromagnetic force harmonics to the vibration of the prototype was analyzed. Research has shown that tangential electromagnetic forces cannot be ignored during the design phase of electric motors and when studying the optimization of motor vibration performance and noise, and they can also have a significant impact.