Analysis And Calculation Of Disc Coreless PMSM Based On HALBACH Array

Disk permanent magnet (PM) synchronous motor is a kind of axial flux motor. Ithas been developed soon abroad recently. Being the high performance served motorand high moment drive device, it has been widely used in themechanical and electrical Integration products. Because it has the features of lowmass, little volume, compact structure, non-lost in rotor, low moment of inertia,electromechanical time constant, high proportion of torque to mass, steady runningstatus in low speed, it can easily be designed to more modules. Being a perfect drivedevice, it could be used in many fields such as numerical control machine,robot, electric vehicle, elevator, home appliance and so on.Being one part of the national project 863 "Design and integration technology ofnew rare earth PM motor ", this paper concentrates on the research of the design andintegration technology of disk PM synchronous motor. Then, a new NdFeB PM motoris developed and correlative problems of design and integration technology are solved.Based on the disk PM synchronous motor, coreless structure and Halbach array areused in the coreless disk PM synchronous motor which results in little mass, highpower density, little shake noise and high efficiency.Because of the special structure of the coreless disk PM synchronous motor,it'smagnetic circuit and electromagnetic load distribution are different to theconventional motor's. Some design rules of conventional motors can't be applied onthe coreless disk PM synchronous motor. Aiming at the features, based on theconventional analysis method and numbers of experiments, the new method ofelectromagnetic computation must be developed.Though the rare earth resource is abundant in China, AC served motor whichmade by ourselves are still not used widely because of the technology and economy.In the meanwhile, high performance AC served motors depend on importation.Because the equipment and system in our country can't meet the needs, numericalcontrol machine will account for more than 22 billion dollars among the importequipment. Accomplished this project, we will be independent in served motor field,and benefit more from this.