CAJ | 학술논문

磁动势与电磁转矩谐波特性的准确计算是对发电电动机起动运行性能进行分析的前提。在发电电动机静止变频器起动低频运行物理过程分析的基础上，建立了此运行阶段电流计算的精确模型，通过实例对电流谐波特性进行了定量计算；然后以此模型推导出了计及时间谐波影响的定子磁动势表达式，分析了不同时间谐波对定子基波磁动势的影响。最后，在计及转子凸极效应影响的情况下，推导出了低频运行过程中电磁转矩解析计算公式，样机电磁转矩的有限元计算结果验证了解析公式推导的正确性。计算结果表明：5次、7次时间谐波对定子磁动势影响最大，而11次、13次与29次、31次影响近似；6次谐波转矩幅值达到恒定分量的44.94%，12次谐波转矩幅值超过恒定转矩分量的30%。
자동세여전자전구해파특성적준학계산시대발전전동궤기동운행성능진행분석적전제。재발전전동궤정지변빈기기동저빈운행물리과정분석적기출상，건립료차운행계단전류계산적정학모형，통과실례대전류해파특성진행료정량계산；연후이차모형추도출료계급시간해파영향적정자자동세표체식，분석료불동시간해파대정자기파자동세적영향。최후，재계급전자철겁효응영향적정황하，추도출료저빈운행과정중전자전구해석계산공식，양궤전자전구적유한원계산결과험증료해석공식추도적정학성。계산결과표명：5차、7차시간해파대정자자동세영향최대，이11차、13차여29차、31차영향근사；6차해파전구폭치체도항정분량적44.94%，12차해파전구폭치초과항정전구분량적30%。
Accurate calculation of magnetomotive force (MMF) and electromagnetic torque harmonics, is the premise of performance analysis for generator/motor starting system. Based on physical process analysis of generator/motor starting with static frequency converter (SFC) operating at low-frequency, the accurate currents calculation model was established under the process, and the currents harmonics characteristic was calculated quantitatively with a living example. Then, the stator MMF expression was derived from the current accurate model within considering the influence of time-harmonic, and it is analyzed that different time-harmonics affects on the stator fundamental MMF. At last, the accurate calculation formula of electromagnetic torque was derived within considering the effect of rotor salient pole, and a prototype electromagnetic torque calculated with the finite element method verified the correctness of the analytic formula derivation. The results show that the effect of the 5th and 7th time-harmonics on stator MMF is the most serious, and that of the 11th and 13th are close to the 29th and 31th time-harmonics. And the 6th amplitude of harmonic torque accounts for 44.94% of constant torque, the 12th harmonic torque is over 30% of that.