短初级单边型直线感应电机倒梯形次级结构电磁特性研究

Study on Electromagnetic Characteristic of Inverted Trapezoidal Secondary Structure of Short-Primary Single-Sided Linear Induction Motor

短初级单边型直线感应电机(SSLIM)的格栅型次级结构存在电磁推力小、法向吸力大等问题。为解决这类问题,提出一种倒梯形次级结构,将现有格栅导条矩形结构变为上表面积大而下表面积小的倒梯形结构,利用SSLIM大转差特性及由此产生的集肤效应,提高了次级感应板有效载流体积及气隙磁密。在初级结构不变的条件下,建立了倒梯形次级结构的SSLIM有限元模型,并与传统格栅型结构在稳态、起动、制动等3种运行状态下进行对比分析,验证了倒梯形结构具有电磁推力大、法向吸力小等优点。

The grille-type secondary structure of the short-primary single-sided linear induction motor(SSLIM)has problems such as small electromagnetic thrust and large normal suction.To solve these problems,an inverted trapezoidal secondary structure is proposed.The rectangular structure of the existing grid guide bar is changed into an inverted trapezoidal structure with a large upper surface area and a small lower surface area.The effective current-carrying volume and air gap magnetic density of the secondary induction plate are improved by using the large slip characteristics of the SSLIM and the resulting skin effect.Under the condition that the primary structure remains unchanged,the SSLIM finite element model of the inverted trapezoidal secondary structure is established,and compared with the traditional grille-type structure under three operating conditions of steady state,starting and braking,which verifies that the inverted trapezoidal structure has the advantages of large electromagnetic thrust and small normal suction.