Electromagnetic Characteristics of a Segmented Rotor Flux-switching Generator with Magnetic Barriers
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摘要: 针对传统分块转子磁通切换发电机在低励磁电流时,空载电动势过轴线对称且正负半周期幅值不相等的问题。提出了一种在定转子上增加气隙磁障的方法以削弱空载电动势中的谐波,改善电动势波形的方法,并且利用电机学公式从理论上分析了其谐波削弱的原理。通过有限元仿真软件对新型分块转子磁通切换发电机静态特性进行了分析,包括磁场分布、空载电动势、磁链等。仿真结果表明,优化后电机空载电动势的电压波形正弦性畸变率降低了83.1%。Abstract: To solve the problem that the no-load electromotive force is symmetrical across the axis of the positive and negative half-cycles and that their amplitudes are not equal when the traditional segmented rotor flux-switching generator has a low excitation current, a method of increasing the air gap magnetic barrier on the stator and rotor is proposed to weaken the harmonics in the no-load electromotive force and improve its waveform. The harmonic weakening principles is analyzed theoretically with the motor formula. The static characteristics of the new segmented rotor flux-switching generator, including magnetic field distribution, no-load electromotive force, flux linkage, etc. are analyzed with the finite element simulation software. The simulation results show that the sinusoidal distortion rate of the voltage waveform of the motor no-load electromotive force after optimization is reduced by 83.1%.
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表 1 三相ESFSG主要参数
参数 数值 参数 数值 定子外径/mm 136 电枢绕组匝数 20 定子内径/mm 82.7 励磁绕组匝数 80 转子外径/mm 82.1 转子极深/mm 12.1 定子轭高/mm 10 电机转速/(r·min-1) 3 000 定子极跨度/(°) 25 定转子铁心材料 DW360-50 转子极跨度/(°) 41 不导磁转子材料 铸铝 表 2 ESFSG的谐波特性
电机 基波幅值/V THD UTHDOOD UTHDEVEN 传统ESFSG 31.6 15.55% 9.23% 12.5% 新型ESFSG 30.6 7.09% 1.52% 2.11% -
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