多相自励磁同步电机零低速域高频电流相位优化策略

Phase Optimization Strategy for High-Frequency Current in Zero-Low Speed Domain of Multiphase Self-Excited Synchronous Motors

多相自励磁同步电机通过在定子侧注入高频谐波电流励磁实现零低速域无刷励磁。然而已有的研究对所注入高频电流的相位尚未充分探讨,限制了在零低速域励磁电流和转矩的进一步提升。针对上述问题,首先基于分数槽集中绕组磁动势原理推导数学公式,分析注入高频电流进行励磁的机制;其次,探讨了高频电流的相位对励磁效果的影响,并提出相位优化策略;最后,采用Maxwell建立了自励磁电机模型,并进行有限元分析对所提策略进行验证。研究结果表明:高频电流相位优化策略在100 r/min时,感应电势增强了17.5%,励磁电流上升了7.5%,转矩增大了6.6%,转矩脉动同比减少71.58%。

The multiphase self-excited synchronous motor achieves brushless excitation in the zero-low speed domain by injecting high-frequency harmonic current excitation into the stator side.However,existing research has not fully explored the phase of the injected high-frequency current,limiting further improvement in excitation current and torque at zerolow speed domain.To address the above problems,this paper first derived mathematical formulas based on the principle of fractional slot concentrated winding magnetomotive force,and analyzed the mechanism of high-frequency current injection for excitation.Next,the effect of the high-frequency current phase on excitation performance was investigated,and a phase optimization strategy was proposed.Finally,a selfexcited motor model was established in Maxwell,and finite element analysis was conducted to verify the proposed strategy.The research results showed that with the highfrequency current phase optimization strategy,at 100 r/min,the induced potential increased by 17.5%,the excitation current rose by 7.5%,torque increased by 6.6%and the torque ripple decreased by 71.58%.