Study Of Fault-tolerant Axial Flux Permanent Magnet Synchronous Motor With Multi-disc Type Coreless Open-end Winding

This paper presents a multi-disc coreless axial flux permanent magnet synchronous motor(MDC-AFPMSM)with widely using.This motor has flat structure high torque density.Furthermore,there is no cogging torque because of no core in the MDC-AFPMSM.Motor and motor drive system are important parts of the power system.The motor can not operate normally and even cause personal injury or property loss at the fault state.The reliability and fault-tolerant performance of this motor are paid more attention.Nevertheless,the study of MDC-AFPMSM is not complete.It needs further development.The electromagnetic performance and fault-tolerant performance of MDC-AFPMSM is studied in this paper.The main content is as follows.The research status of disc motor,disc coreless AFPMSM,fault-tolerant motor and multi-phase motor are summarized in this paper.The magnetic path of motor is studied by the formula basing on the motor principle and the performance demands.From the simulation,the motor structure is choose including permanent magnet pole-arc ratio,the height of the permanent magnet and yokes and the winding topology.The three dimensional model of the motor is built.The motor electromagnetic performance is studied by the finite element analysis simulation.The fault-tolerant performance of multi-disc increases with phase number increasing.The motor topology and drive circuit are studied in term of the motor performance.Moreover,this paper presents a multipurpose majorization formula.The equation includes the motor property,fault tolerance capacity,price and the complexity of drive circuit.The phase of motor is determined by the function analysis.This paper presents an AFPMSM with Multi-disc type coreless open-end winding.In order to test the fault-tolerant performance,this motor is analyzed by the finite element analysis method.This paper proposed a detailed manufacturing motor on the basis of the simulation results.The production provides experience for future motor manufacture.The back EMF,torque and fault-tolerant performance is studied by experiment.The experimental test results are almost same as finite element simulation results.Both of result are mutually confirmed.And the fault tolerant capacity of the MDC-AFPMSM is demonstrated.