| In the course of human survival and sustainable development, energy and environmental issues need to be resolved. Currently, conventional energy sources including coal, oil and gas, not only limited resources, but also caused serious environmental pollution. Therefore, the development and use of renewable, has attracted worldwide attention, especially wind energy resources. Wind energy is a clean, safe, renewable green energy, efficient use of wind energy is of great significance for achieving sustainable.In a variety of generators, flux reversal permanent magnet motor(FRM) has a simple structure, high efficiency, no gear box, etc.,suitable for small wind power systems. Reversal flux permanent magnet motor is a modified form of doubly salient permanent magnet motor, which is on the basis of a combination of switched reluctance motors and permanent magnet brushless DC motor based on the further development of the permanent magnet is placed in the surface of the stator sailent pole make permanent magnet is easy to install, with the rotation of the rotor, the flux reverses polarity in the stator concentrated coils, FRM has some advantages of good usage of windings, simple construction and low rotor inertia. This machine can be widely applied in wind power generation, automobiles and aerospace. Although FRM groundbreaking development, but there are also some disadvantages, cogging torque is one of concern, the current research on the FRM is still far from comprehensive, just stay in the initial theory and prototype experimental stage, there are many deficiencies in the structure and perfoemance.The main content of this paper is comparative analysis of three different structures FRM, these three structures were6/14pole inner rotor with same tooth width FRM,6/14pole outer rotor with same tooth widthFRM,6/14pole inner rotor with tooth width uneven FRM. In this paper, the design process is deduced the structure of the three motors, the main dimensions of the motor structure is similar, then built the mathematical model of FRM, carry out finite analysis. Use Ansoft simulation tools, theses three different structure were calculated and analyzed to compare the characteristics of different rotor structures under no load.Since the cogging torque in the FRM has serious problem, for the6/14pole inner rotor prototype, this paper proposes a new method, the original prototype of rotor tooth with same width change into combination of the rotor tooth width8°with20°, since this kind of motor is a flux reversal type, the phase of the cogging torque are mutually transformed by taking the combination of the two tooth width, may weaken the cogging torque. Through analysis and calculation, after the rotor tooth width optimized FRM can guarantee their own advantages, while maximizing weaken its cogging torque, and significantly better than the other two structures FRM.In this paper, three different structures FRM external characteristics were compared. Generator voltage regulation is a measure of the external characteristics of key performance indicators, as FRM is a permanent magnet excitation, thus the magnetic field adjustment difficulties, in order to make the generator has better performance, minimize inherent voltage regulation has an important significance. According to the same resistive load an RL load, simulation analysis of three different structures FRM. Through the comparative analysis, in the same size, whether it is resistive load, or RL load, the external characteristics of the inner rotor structure FRM superior structural properties of the outer rotor FRM.Based on the generator convention, established6/14pole FRM mathematical models abc and dqO in the coordinate system, and carried out using Matlab Simulink simulation, the simulation results were compared with Ansoft simulation waveform consistent, proven finite element FRM correctness of the analysis method. |
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