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针对常导型高速磁浮列车用直线同步电机的电磁力波动问题,分析导致电磁力波动的原因,提出一种基于分数槽理论来抑制电磁力波动的方法,分析直线同步电机不等极距结构设计对谐波电动势和齿槽力的影响。分析结果表明:采用合适的不等极距设计可以抑制谐波电动势和齿槽力,从而达到抑制电磁力波动的目的。给出一个基于等效极对数的定子和动子极距最优化选择公式,采用有限元仿真方法对不等极距直线同步电机电磁力波动进行了仿真研究。仿真结果表明:电磁力波动得到了较好的抑制效果,推力最大波动从35%减小到5%,悬浮力最大波动从6%减小到0.13%。
Aiming at the electromagnetic force fluctuation of rectilinear synchronous motor used in the normally-guided high-speed maglev train, the cause of electromagnetic force fluctuation is analyzed. A method based on fractional slot theory is proposed to suppress the electromagnetic force fluctuation. Effect on Harmonic EMF and Cogging Force. The analysis results show that the use of suitable unequal pole pitch design can restrain the harmonic electromotive force and cogging force, so as to achieve the purpose of suppressing the electromagnetic force fluctuation. A selection formula of stator and rotor polar distance based on equivalent pole pairs is given. The electromagnetic force fluctuation of unequal polar linear synchronous motor is simulated by finite element method. The simulation results show that the fluctuation of electromagnetic force is well restrained, the maximum fluctuation of thrust decreases from 35% to 5%, and the maximum fluctuation of suspension force decreases from 6% to 0.13%.