Analysis Of Magnetic Field And Performance For High Voltage Pump Induction Motor With Skewed Stator Slots

High voltage pump induction motor is an important electric drive equipment, whichis very extensive application in the industry. Air-gap magnetic field contains large toothharmonic of the motor. Aiming at this problem, skewed stator slots structure was appliedto high voltage pump induction, the main works are as below:Firstly,2D time harmonic field finite element model was established for highvoltage pump induction motor with straight slots structure. Current density distributionand air-gap magnetic field distribution were got under no load, rated and starting statusby solving the time harmonic field, steady state slip torque curve was got by calculatethe electromagnetic torque under different slip. Dynamic performance was also gotunder no load starting and load starting by solving the2D transient field finite elementmodel.Secondly,3D time harmonic field finite element model was established for highvoltage pump induction motor with skewed stator slots structure with1rotor pitch. Theaxial magnetic field distribution was got by comparing different axial position fluxdensity. The best skewed slots degrees with0.7rotor pitch was got by changing thedegrees of skewed stator slots from0.7-1.3rotor pitch in consideration of efficiency ofthe motor. Skewed slots structure changed the copper loss and iron loss distribution bycomparison the loss. The starting performance was got by calculated the3D transientfield finite element model with the best skewed slots degree.Finally, Winding electromagnetic force was calculated and the distribution ofelectromagnetic force was got for the high voltage pump induction motor. Windingelectromagnetic force is reduced with skewed slot either starting status or rated loadstatus by comparison. The modal and natural frequency of the stator part were alsocalculate in condition of2D finite element model and3D finite element model through the software of ANSYS. Vibration mode is more rich and it can be better reflect theactually running condition of the motor by3D finite element analysis.