Abstract
The article describes a mathematical model of interconnected electromechanical and thermal processes in a linear induction motor (LIM). Here, we present the structure of the thermal model and provide the calculation formulas of the model. The thermal model consisted of eight control volumes on each tooth pitch of the LIM. Moreover, we also present a model of electromechanical processes and its interaction with the thermal model. The electromechanical model was based on the detailed magnetic and electrical equivalent circuits of the LIM. Model verification was performed using a model based on the finite element method and using experimental data. We also conducted a study focused on the necessity of considering the influence of various features of the thermal processes. We herein discuss the application of the model implemented in the MATLAB/Simulink, which was used to analyze the thermal performance of linear transport and technological induction motors. For the traction single-sided linear induction motor, we determined limits of safe operation by considering the unevenness of heating along the length in two cases: natural cooling and forced cooling. For forced cooling, required values of air flow were determined. For the arc induction motor of the screw press, the influence of various factors (i.e., reduction of the stroke, the use of a soft start, and the use of a forced cooling) on heating was evaluated.
Highlights
The analysis of thermal processes in conjunction with electromechanical processes is a priority task in the study of the operating modes of an electric drive based on a linear induction motor (LIM)
Using programs crecreated on its basis, the traction of the urban transportation system and the arc LIM
Computationally efficient approach based on multidimensional arrays was used for thermal processes calculation
Summary
The analysis of thermal processes in conjunction with electromechanical processes is a priority task in the study of the operating modes of an electric drive based on a linear induction motor (LIM). The need for such analysis may arise when designing a LIM. LIM studies are further complicated by the fact that they significantly differ from the rotating IMs in specific electromagnetic processes due to the longitudinal and transverse edge effects These phenomena are well examined and described in previous publications [2,3,4,5,6]
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