Abstract When linear induction motor is used as traction motor of rail transit vehicles, the secondary induction plate will be missing in turnouts, turns and other sections, and the equivalent circuit with continuous secondary is no longer applicable. For this special working condition, a equivalent circuit based on the new air gap flux density distribution model and considering secondary discontinuity is proposed. Firstly, the analysis model of linear induction motor with discontinuous secondary is established. According to the coupling conditions of the primary and secondary, the discontinuous working condition is divided into three stages. Then, the linear approximation method is used to correct the primary leakage inductance, excitation inductance and other parameters which vary with the length of the coupling region. Combined with the new air gap flux density distribution model and the discontinuous condition of the secondary, considering the influence of longitudinal end effect, the excitation inductance on the excitation branch and the equivalent resistance representing the eddy current loss of end effect are modified. The equivalent circuit of three stages is derived to represent the dynamic process of the primary passing through the discontinuous region of the secondary induction plate. Finally, the dynamic curve of the thrust and efficiency of the motor are obtained according to the equivalent circuit, and the correctness of the proposed equivalent circuit is verified by comparing with the experimental results.
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2021, Vol. 36 
