Analysis And Calculation Of The Magnetic Field Of The Disc Coreless PMSM With Load

Disk permanent magnet synchronous motor is a kind of permanent magnet motor, which is the high performance servo motor developing recently. It has many advances such as small volume, low weight, close structure, low moment of inertia of rotor, steady operation and so on. It has been made use of widely for military affairs, spaceflight, agriculture and daily life refered to as new drive device. Being one part of the national project 863"Design and integration technology of new rare PM motor", the study object of this paper is the disk coreless PMSM based on Halbach array. Because of the coreless structure, the motor has less mass, lower loss and noise so that power is improved.Owing to the especial structure of the motor, the magnetic circuit of the disk coreless PMSM is different from the other common radial motors so that the former methods can't be used to design this motor.In the paper, we build the 2D and 3D model of the armature and load magnetic field according to the structure of the motor. Then making use of the 2D and 3D finite element method to compute and analyze the magnetic field distributing with load. The influence of the armature magnetic field to the main field and the differences between the 2D and 3D FEM are discussed.Both the radial and axial magnetic field of the disk coreless PMSM are variational in that the motor belongs to the axial magnetic field motor. So some of the electromagnetic parameters are computed with the help of the FEM magnetic field numerical calculation. In the paper, some methods for the parameters calculation are introduced.The analysis of the armature reaction of the motor is an accessorial effect on the motor designation and improves the development of it. The disk coreless PMSM based on Halbach array could be used widely in many fields so that the motor was manufactured successfully could promote the development of interrelated product.