Performance Analysis Of Stator Hybrid Laminated Remanufacturing Permanent Magnet Synchronous Motor

The continuous development of new energy vehicles puts forward higher requirements for motor performance.A large number of motor products will be phased out gradually.Establishing a reasonable and feasible motor remanufacturing method can save a lot of resources and energy consumption.At present,there are few studies on performance improvement of remanufactured stator cores.In this paper,a hybrid laminated remanufactured stator is made of silicon steel and amorphous alloy,and its influence on motor performance is studied.Firstly,the performance of the motor under different mixing ratios were compared and analyzed.Considering the remanufacturing cost,the mixing ratio of materials is 50%.At this time,the efficiency improvement rate of unit material is the highest.According to the results of performance comparison analysis,the hybrid laminated stator mainly affected the motor’s torque performance,loss performance and air gap flux density,which determined the direction for follow-up research.Then,according to the structure characteristics of hybrid laminated stator,the superposition calculation method of cogging torque and output torque was proposed.Based on the superposition calculation method,the cogging torque and output torque of hybrid superimposed stator remanufacturing motor were optimized and analyzed respectively.The cogging torque was decreased by sectional reverse skewed slots,while the output torque was restored by adjusting the winding turns and slot size.According to the output torque optimization scheme,a prototype was made and the load performance was tested,which verifies the effectiveness of the optimization method.Then,the influence of hybrid laminated stator on the axial distribution of no-load air gap magnetic flux density was studied.When one of the materials is close to saturation,the magnetic conductivity between the two materials is quite different,which makes the axial distribution of air gap magnetic density have a certain deflection.On the basis of establishing the bias distribution function,the calculation results of magnetic density were corrected.The maximum errors of magnetic density calculation results for silicon steel and amorphous alloy are 4.9% and 4.0%,respectivelyFinally,based on the study of no-load air-gap magnetic density,the influence of hybrid laminated stator on the magnetic density and iron loss of stator was further explored.Similar to the air-gap flux density,the distribution of flux density in stator has a certain deflection.The axial distribution function of the magnetic density in different part of the stator was obtained by establishing the difference function of magnetic density.The no-load iron loss of the hybrid laminated stator was calculated and compared with the no-load test results of the prototype.The error is about 10.71%,which verified the validity of the calculation method.