Research On Novel Double-layer Winding Ironless Permanent Magnet Linear Synchronous Motor

The ironless permanent magnet synchronous linear motor(IPMLSM)has the advantages of low thrust fluctuation,fast response and easy control.It is widely used in precision positioning systems,including laser test platforms and IC manufacturing equipment,but the thrust density is low due to the ironless structure.In order to increase the thrust density,in addition to the magnetic pole usually adopts a bilateral structure and a Halbach structure,and the winding often adopts a distributed overlapping winding.The disadvantage is that the end structure is complicated and difficult to manufacture and install.In order to increase the thrust density as much as possible,a new double-layer winding IPMLSM is proposed,which divides the winding into two layers,each of which is a concentrated winding(DW-IPMLSM).Firstly,a topology model of a 9-coil 6-pole DW-IPMLSM is introduced to compare the winding coefficients with different winding structures.Secondly,the genetic algorithm is used to optimize its structural parameters,and an optimization scheme is obtained.Then detailed analysis is carried out.The electromagnetic performance of the motor is used.After that a control algorithm program is designed based on the position sensorless algorithm and the vector control algorithm..Finally,a prototype was created to verify the results of the analysis.The results show that the proposed DW-IPMLSM has the best electromagnetic performance,which not only avoids the complicated end structure of the end overlapping windings,reduces the volume of the motor,but also effectively improves the thrust density,and is suitable for long-running systems and precision positioning system.