Analysis And Design Optimization Of Arc Linear Induction Motor

With the development of electric drive technology,many new motion systems have emerged.With the development of modern electromechanical systems in terms of sophistication and complexity,single degree-of-freedom(DOF)motion motors have been unable to reach the demand.Traditional multi DOF motion systems still have defects such as complex structure,difficult maintenance and insufficient flexibility,resulting in certain restrictions.In the multi DOF motion system,the linear induction motor(LIM)has the characteristics of simple structure,low secondary structure requirements,simple transmission equipment,and suitable for multiple primary to share one secondary.Therefore it has good research and application value.This paper used arc linear induction motor(ALIM)as the core of the spherical multi DOF motor,carrying out research and optimization work.Doing research aiming at the characteristic of "multi DOF movement around any axis",and established a realization method of the spherical multi DOF motor.First,the structural characteristics and side effects of LIM are analyzed.Based on the special structure of the ALIM,an improved equivalent circuit was proposed,which took into account the influence of the composite secondary magnetic layer;combined with FEA,the accuracy of this method was proved;combined the modified parameters of 2D FEA model,this paper analyzed the specific influence of the side effects on thrust,efficiency,current,magnetic field,inductance and other parameters.Next,the experimental research was carried out on the ALIM.A rotary experimental platform was designed,which has the characteristics of simple structure,small size,and supports multi-motor operation;the influence of some structural parameters was analyzed,so the specific design parameters of the experimental platform were determined;experiments on the mechanical characteristics and current characteristics of the zero-load and under-load were carried out,the effect of the 3-phase alternate connection method on the suppression of current asymmetry was experimentally measured;combined with the stopping curve,the motor system’s moment of inertia and resistance torque were tested measuring.Then,in order to obtain a higher performance motor,the ALIM was designed and optimized.An improved design method was proposed,which took into account the iteration and secondary impedance of the magnetic field,and had better design accuracy;the influence of structural parameters on circuit parameters and performance parameters was analyzed,and an objective function integrating multiple performance parameters was proposed.Multi-variable optimization and optimization based on genetic algorithm(GA)were carried out.After optimization,the overall performance of the motor is increased by 15.02% and 18.14% respectively.Finally,a spherical multi DOF driver based on the arc linear induction motor was designed,a three-dimensional physical model was established,so as the design idea and the direction still waiting for optimized.The thrust of each ALIM and the overall torque output of the motor were determined.