Research On The Application Of Amorphous Alloy In The Permanent Magnet Motor

Amorphous alloy successfully applied in power transformer field for its excellent performance.This paper mainly studied the application of amorphous alloy in axial flux permanent magnet motor which realized high efficiency and high torque density by adopt amorphous alloy.The major works are as follows.Firstly,the eddy current loss in permanent magnet of axial flux amorphous alloy motor(AFAAM)with single rotor and dual stator is analyzed and calculated,the necessity and calculation method of research on the eddy current loss in permanent magnet of amorphous alloy motor are analyzed.By 3D time-stepping FEM,eddy current loss in permanent magnet of different air gap lengths,open slot widths and pole-slot combinations are simulated,the influence of parameters to eddy current loss in permanent magnet is obtained,and the variation rule of eddy current loss in permanent magnet is summarized.Secondly,an AFAAM of 7kW and 4000r/min is designed.When choosing the motor’s parameters,the slot type of stator is open slot structure on considering of the specificity of amorphous alloy material.In this paper,the dimension,pole-slot combination,flux density in stator tooth and yoke.pole-arc factor of permanent magnet and stator slot width of amorphous alloy motor are contrastive analyzed,and the performances of motor adopt magnetic wedge and non-magnetic wedge are compared.Through the choice of motor’s parameters,the efficiency of amorphous alloy motor reached 93.34%.Finally,temperature field analysis is carried out on the AFAAM.The verification of temperature rise processed on the axial flux permanent magnet motor of 8.5 kW.the simulation result is that the average temperature rise of stator winding is 68.6K,whose error is 10.4%.and the error of average temperature rise in permanent magnet and the cover is 9.2%and 4.8%respectively.Applied the design method of axial flux density motor’s water-cooling system to AFAAM.temperature field simulation is processed and indicated,that the temperature rise can meet the requirement.