Research On Torque Ripple And Iron Loss Of Switched Reluctance Motor Based On The Filed-circuit Couple

As a new type of speed control system,switched reluctance motor has been widely used in a series of industrial areas becaues of its advanages such as simple structure,economy and reliability.However,on the hand due to the high non-linearity of the magnetic field in the motor and edge effect,switched reluctance motor also has some defects such as large torque ripple and obvious noise.On the other hand with the increase of the motor capacity,the iron losses is significantly improved.The temperature problems will also bring some risk to the motor safe operation.The above-mentioned facts has seriously restricted the future development and application of the switched reluctance motor.In this paper,from the perspective of optimizing the structure,the stator pole is improved to optimize the torque ripple and iron losses of the motor.First,based on the boundary value problem and circuit equation of the motor,the field-circuit coupling model is established.The static and dynamic analysis are carried out based on the finite element with Maxwell.In the static analysis,the electromagnetic curves of the finite element analysis are applied in the Matlab simulation and the speed control experiment.The good control effects shows that the model and the results of the finite element analysis are correct and reasonable.In the dynamic analysis,the current chopping control is used to further test the correctness and rationality of the model.Secondly,the influence on the torque ripple and iron lossed of the motor structural parameters such as the width of the rotor and stator,the main dimensions,the air gap and the winding form are deeply analyzed and revealed.The intuitive results are obtained and that drives the furture structure optimization of the motor.Finally,an optimizational design based the stator pole is proposed.Through improving the traditional air gap into two-stage air gap,the electromagnetic field distribution of the tooth tip is improved and then the torque ripple and iron losses are suppressed.The finite element analysis of the two parameters in the optimizational design is carried out,and the influence on the torque ripple is obtained.The optimal structural parameters are determined.Compared the initial motor model with the optimal model using Matlab simulation,the results show that the optimal design can suppress the torque ripple effectively.The iron losses of different structural parameters are calculated and the.The results show that the optimal design can also suppress the iron losses.