电机与控制学报
電機與控製學報
전궤여공제학보
ECTRIC MACHINES AND CONTROL
2014年
4期
52-59
,共8页
直线感应电机%长初级%纵向动态端部效应%气隙磁场%品质因数
直線感應電機%長初級%縱嚮動態耑部效應%氣隙磁場%品質因數
직선감응전궤%장초급%종향동태단부효응%기극자장%품질인수
linear induction motors%long primary%dynamic longitudinal end effect%airgap magnetic field%goodness factor
为了研究纵向动态端部效应对长初级直线感应电机磁场和性能的影响，建立并求解了长初级直线感应电机考虑纵向动态端部效应时的一维时谐磁场方程，分别给出了基本行波、入端行波和出端行波气隙磁密的解析表达式，分析了3种行波磁场幅值、相位和波形的特性，以及端部效应行波对气隙磁场分布的影响，通过二维有限元数值计算验证了气隙磁密解析解的正确性。给出了衰减常数、半波长和波速等端部效应特征参数随品质因数的变化规律。分析结果表明，长初级与短初级结构的气隙磁场分布存在较大差异，当电机在高速运行时更为明显。调整电机设计参数以减小品质因数可以有效地削弱纵向动态端部效应，但这些方法也会降低电机的正常运行性能，在电机设计时应综合考虑。
為瞭研究縱嚮動態耑部效應對長初級直線感應電機磁場和性能的影響，建立併求解瞭長初級直線感應電機攷慮縱嚮動態耑部效應時的一維時諧磁場方程，分彆給齣瞭基本行波、入耑行波和齣耑行波氣隙磁密的解析錶達式，分析瞭3種行波磁場幅值、相位和波形的特性，以及耑部效應行波對氣隙磁場分佈的影響，通過二維有限元數值計算驗證瞭氣隙磁密解析解的正確性。給齣瞭衰減常數、半波長和波速等耑部效應特徵參數隨品質因數的變化規律。分析結果錶明，長初級與短初級結構的氣隙磁場分佈存在較大差異，噹電機在高速運行時更為明顯。調整電機設計參數以減小品質因數可以有效地削弱縱嚮動態耑部效應，但這些方法也會降低電機的正常運行性能，在電機設計時應綜閤攷慮。
위료연구종향동태단부효응대장초급직선감응전궤자장화성능적영향，건립병구해료장초급직선감응전궤고필종향동태단부효응시적일유시해자장방정，분별급출료기본행파、입단행파화출단행파기극자밀적해석표체식，분석료3충행파자장폭치、상위화파형적특성，이급단부효응행파대기극자장분포적영향，통과이유유한원수치계산험증료기극자밀해석해적정학성。급출료쇠감상수、반파장화파속등단부효응특정삼수수품질인수적변화규률。분석결과표명，장초급여단초급결구적기극자장분포존재교대차이，당전궤재고속운행시경위명현。조정전궤설계삼수이감소품질인수가이유효지삭약종향동태단부효응，단저사방법야회강저전궤적정상운행성능，재전궤설계시응종합고필。
To investigate the influence of the longitudinal dynamic end effect ( LDEE ) on the magnetic field and performance of the long primary double-sided linear induction motor ( LP-DSLIM) , the one-di-mensional time-harmonic magnetic field equations in the airgap region of LP-DSLIM, accounting for LDEE, were developed and solved. The analytical solutions of the fundamental airgap fields and the com-ponent fields due to entry-and exit-end are derived. The characteristics of the amplitude, phase and waveform of each three components of the traveling wave, as well as the LDEE wave’ s influence on the airgap magnetic field distribution were both analyzed. The analytical results were compared and validated by the predictions from corresponding two-dimensional finite element analyses. The variations of LDEE-related characteristic parameters, such as attenuating constant, half-wave length and wave velocity, with the goodness factor were given. The analysis results show that LP-DSLIM and its short primary counter-part exhibit are quite different on the airgap magnetic field distribution, especially operating at high-speed conditions. By adjusting the motor design parameters, the measures to reduce the goodness factor may ef-fectively alleviate LDEE, whilst these effects also degrade the LP-DSLIM fundamental performance. Therefore, the compromised measures should be taken during the design procedures for LP-DSLIM.
