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An induction motor operated with high voltage source generally generates high current in starting mode and has a long transient time after being started. This large and sustaining starting cur- rent causes the end windings of the stator to have excessive electromagnetic force. This force is the source of vibration and has a negative and serious influence on the insulation of end windings. There- fore, designing the end winding part with an appropriate support system is needed. To design the sup- port ring enclosing the end windings, we analyze the distribution of electromagnetic force on the end windings by applying the Biot-Savart's law and the 3D finite element method (FEM), and comparing two simulation methods. Finally, we verify the safety of the support structure of the end winding part using stress analysis, which is analyzed with the electromagnetic forces from the 3D FEM simulation. tromagnetic force acting on end windings of a high-power induction motor by using two calculation methods. One is Biot-Savart's law and the other is 3D FEM. The latter can analyze end winding forces more precisely than the former. As an application of the force calculation results, we can conduct a stress analysis of the end windings by inputting the force distribution already calculated by 3D FEM. Fi- nally, we design the support ring surrounding the end wind- ings to prevent the fault of winding insulation by stress caused by electromagnetic forces. The proposed method can be widely applied to enhance the reliability of electri- cal machines in the future.

Comparison of Biot-Savart's Law and 3D FEM in the Study of Electromagnetic Forces Acting on End Winding