Linear induction motor is an important kind of machines which have some merits such as simple structure , low cost , durability , convenience for maintenance etc . the subject of this thesis is to study a big circular ring linear induction motor , and the major works in this thesis are summarized as follows : ( 1 ) considering the effects of the finite length of primary core , one - dimension analytical solution for the air gap field is cited in this paper . based on it , the single layer winding magnetic field is studied . considering whole - pitched and short - pitched winding configuration with odd poles and half - fulled slots in both ends , the double - layer winding magnetic field is analyzed , respectively 本文對大圓環直線感應電機進行了深入細致研究,內容包括: ( 1 )本文采用有限長行波面電流作用于有限長鐵芯上的模型,引用了氣隙磁場一維解,研究了單層繞組磁場,奇數極半填槽雙層繞組在采用整距和短距時磁場的分析、比較,簡單介紹了二維解; ( 2 )用有限元軟件ansoft對大圓環直線感應電機空載氣隙磁場進行了靜態分析,并分析了結果; ( 3 )用軟件進行了額定電壓下的瞬態分析,得到了轉矩,位移,轉速隨時間變化曲線圖,利用單極性霍爾元件測定轉速并與軟件計算結果進行了比較,采用等效電路法計算了堵轉時的最大電磁力并做實驗進行了驗證,由實驗測得了三相電流波形,并與計算結果進行了比較,對其不對稱性進行了定性分析。