Abstract
This paper expounds the application merits of disk type PM synchronous generator in small-scale wind power generation .The characteristics of the disk type PM synchronous generator were analyzed and 8P, 200W disk type generator with 90 degree Halbach magnet structure was designed. Simulation and calculation are carried out by using finite element method. By comparing the 90 degree Halbach magnet structure and the traditional magnet structure of the disk type generator, the results shows that the 90 degree Halbach magnet structure can improve the air gap magnetic density, reduce the leakage of main magnetic circuit and the loss.
Highlights
Disc type permanent magnet synchronous motor with axial flux characteristics plays an irreplaceable role in many fields
A coreless axial-flux machine with Halbach structure in direct-drive wind power generation field has the following advantages: (1) small axial size, high power density, simple structure; (2) coreless structure has no cogging effect which can effectively reduce the motor vibration and noise caused by the cogging; (3) the magnetic pole has a special Halbach structure which hold better sine degree of air gap magnetic density, avoiding the additional loss caused by harmonic
The three dimensional electromagnetic finite element calculation of the designed 8P and 200W disk motor is carried out The characteristics of magnetic field distribution of motors are studied through the analysis of the finite element field plots results and numerical results; The influence of different Halbach magnetic pole structure and magnetic pole thickness on the air magnetic flux and peak value is studied as well
Summary
Disc type permanent magnet synchronous motor with axial flux characteristics plays an irreplaceable role in many fields. A coreless axial-flux machine with Halbach structure in direct-drive wind power generation field has the following advantages: (1) small axial size, high power density, simple structure; (2) coreless structure has no cogging effect which can effectively reduce the motor vibration and noise caused by the cogging; (3) the magnetic pole has a special Halbach structure which hold better sine degree of air gap magnetic density, avoiding the additional loss caused by harmonic. The study on the coreless disc generator with Halbach structure in the direct drive wind power generation field has important practical significance. The three dimensional electromagnetic finite element calculation of the designed 8P and 200W disk motor is carried out The characteristics of magnetic field distribution of motors are studied through the analysis of the finite element field plots results and numerical results; The influence of different Halbach magnetic pole structure and magnetic pole thickness on the air magnetic flux and peak value is studied as well
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