Study On Design Of Pernanent-Magnet Brushless DC Motor For Washing Machine

With PMBLDCM technology continues to break the key, especially in permanent magnet materials technology and sensor technology and other new technology improved, the breakthrough break through the development of PMBLDCM application bottlenecks. The people to improve the quality of life, high efficiency and low noise brushless DC motor direct drive system of universal application in household appliances has become an inevitable trend. Analysis of the article in the brushless DC motor based on the advantages and disadvantages of its own, combined with the practical application of the washing machine, designed a low noise high efficiency, in line with washing machine system characteristics and the actual requirements PMBLDCM.Firstly, based on the main theory of permanent magnet brushless DC motor, the design method was analyzed in detail. Considering the practical application in washing machines, the design criteria, maximum efficiency and minimum torque ripple, which means high efficiency and low noise, was presented in this paper.Secondly, the electromagnetic design of permanent magnet brushless DC motor was accomplished to gain the maximum efficiency. Using the design experiences of traditional DC motors with or without brush, the mechanical characteristics and other parameters were solved and the primary electromagnetic design result was acquired in order to gain the maximum efficiency.Thirdly, on the basis of the rated technical specifications and the primary electromagnetic design result, the electromagnetic calculation was accomplished using motor design software which was basing on the equivalent magnetic circuit method. According to the analyzing result of the software, the experience parameters were corrected and the size parameters were optimized. In choosing the materials of the motor, both performance and cost were taken into account.Lastly, using the electromagnetic FEM software, the behaviors of the motor were simulated under both steady and transient state. The starting operation of the motor with or without load and the armature reaction were analyzed. The solution of the problem that the torque ripples could not be suppressed by the chutes in the 2-D FEM simulation was presented. This design was proved to be rational by the experimental results.