Finite Element Analysis On Motor Performance Of Doubly Salient Hub Motor For Electric Vehicle

The paper builds mathematic models of doubly salient hub motor (DSHM) byresearching and analyzing its operating principles deeply. Based on the performancerequirements of electric vehicles, the structure and size of DSHM are identified initiallyby the theoretical knowledge of traditional motor design. The thesis forms the ‘sizing’function module by designing the calculation process and program and uses it toinitially identify the structure and size of12/8poles DSHM.The thesis shows a2D finite element mathematic model and the finite elementcalculation process of DSHM, and illustrates the finite element calculation process ofDSHM with skewed rotor by2D magnetic field FEM with using axial segment. Basedon the foundation of MFC of VC++, it forms magnetic FEM software whose functionare sizing, finite element pre-processing, calculation and post-processing for DSHM byusing C++ALGOL according to the above design process.Using such software, the motor performance is accounted by magnetic FEM. Bycomparison with the design requirements, some data on the initial scheme are revisiedto obtain the final project. And then it analyzes the static characteristics of rotor straightslot motors.These characteristics include no-load static characteristic such asdistribution of magnetic field lines, winding flux and positioning torque characteristicsetc. To reduce the torque ripple and positioning torque with rotor straight slot, hence,the results of static characteristic by calculating and analyizing the electromagneticparameters of different rotor position with rotor skew structure deeply prove that rotorskew can reduce the positioning torque, improve the winding EMF waveform.