Simulation And Optimization Of Bladeless Wind-driven Permanent Magnet Linear Generator

With the widespread application of clean energy,the development and utilization of wind energy has gradually become a research hotspot.Based on this,a new type of bladeless wind power generation device is proposed in this paper.According to the physical characteristics of the vortex-induced resonance of the cylindrical object in the flow field,a cylindrical permanent magnet linear generator is applied in it.At present,there are few researches on the aperiodic simple harmonic motion of permanent magnet linear generator under resonance condition.In the multi-objective optimization of motor,the intelligent optimization algorithm usually needs more tests to establish the function of the optimization objective,in this paper,we will compare two modeling methods that require less tests,and choose the modeling method with good predictability and relatively fewer tests.Therefore,the output performance and optimization of the motor under vortex-induced resonance are mainly studied in this paper.(1)A cylindrical permanent magnet linear generator is designed for energy conversion for the bladeless wind turbine.Combined with the operating principle and structural characteristics of the bladeless wind turbine,the initial model of the generator is designed by the method of field and road combination.The simulation software was used to correct the no-load magnetic flux leakage coefficient and no-load working point of the designed generator,and the axisymmetric model of the designed PMLG parameters was re-established and verified.The results show that the preliminary design of the motor meets the design requirements(2)The motion trajectory of the bladeless wind power generation device is transformed as the input parameter of the motor.The voltage,power,average thrust and efficiency of the cylindrical permanent magnet linear generator at different speeds were analyzed by using the finite element simulation software.The arctangent function and sinusoidal function were used to approximate the trajectory of the aperiodic simple harmonic motion under the design wind speed.The output performance of voltage and power of the generator at the same reciprocating frequency with different amplitudes and the same amplitudes with different frequencies is studied.Simulation results show that the relative to other conditions,issued under the condition of wind resonance motor has good output performance,approximating function compared with the simulation results,when the frequency is constant,the generator voltage,power and efficiency are increased with the increase of the amplitude,when amplitude constant,voltage,power and efficiency shows the tendency of increase after decreases first with the increase of the frequency.(3)Multi-objective optimization algorithm was used to improve the initial design of the motor body structure and achieve the gain optimization.In order to reduce the number of structural parameters to be optimized,the variance weight method was used to calculate the objective weight matrix,and the weighted weight matrix and the comprehensive sensitivity were calculated by combining the subjective weight matrix.Uniform experimental design-stepby-step regression modeling method and BBDRSM method were used to establish the optimization objective function model respectively.Non-dominated sequencing genetic algorithm was used to optimize the established model,and the modeling method with less test times and high prediction accuracy was selected.The results show that appropriately increasing the number of tests required for uniform experimental design and modeling can effectively improve the prediction accuracy.The obtained mass power density is increased to 10.757 W/kg,the thrust fluctuation is reduced to 0.1989,the average thrust is increased by 39.12%,and the efficiency is slightly improved.The multi-objective optimization is realized.