| The permanent magnet adjustable speed drive (PMASD), designed based on electromagnetic induction principle, is a new type of power transmission device for a motor drive system, which can realize the speed control of a centrifugal load with energy efficiency. With a serious of advantages such as high-efficiency, reducing the system vibration, high reliability, no-load start and overload protection, good ability to adapt to circumstances, the PMASDs have aroused extensive attention from scholars and high energy consumers worldwide. The development of this study has profound significance for improving the efficiency of motor system and implementation of the national energy conservation policies. With the help of finite element simulation analysis, the characteristics and distribution of magnetic field, eddy current field and thermal field of the cylindrical PMASD prototype were studied and investigated. The structure parameters of the cylindrical PMASD were optimized at the same time. The research can provide reference for the development, design, manufacture and engineering application of cylindrical PMASDs.Based on the two-dimensional and three-dimensional finite element models of the cylindrical PMASD prototype, electromagnetic calculation were carried on, then magnetic field distributions were solved by ANSYS software. The corresponding curves of output power, torque and axial force in different slip ratios and meshing area were in-depth studied as well.The distribution law of eddy current was analyzed and the relationship between the power loss and slip ratios and meshing area was studied. Through the magnetic-thermal coupling analysis, the temperature of key parts when the cylindrical PMASD works was simulated.The experimental system of the cylindrical PMASD prototype was set up and the running condition of the prototype in different slip ratios and meshing area was measured. The correctness of the finite element analysis method was validated by comparing the results of the finite element simulation to the data of the experiment. The practical running characteristics and energy-saving effects of the prototype were also measured and recorded.Based on the initial structure of the cylindrical PMASD prototype, the effects of different structural parameters and materials on the output power were studied, including the thickness of conductor loop, yoke block, air gap, the duty cycle, size and poles of permanent magnet, as well as the material of key parts. According to the results, the optimization design of a 25kW cylindrical PMASD was completed, which reduced the cost of material by 20.1% and the weight by 27.2%, and strengthened the load capacity. |
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