Optimization Design And Characteristic Analysis Of Novel Solid Rotor Induction Motor With Toroidal Winding

Solid rotor induction motor is widely used in torque motor and heavy load starting field because of its strong structure,low maintenance cost and good thermal stability of rotor.The toroidal winding structure provides a new winding structure scheme for solid rotor induction motor because of its short end winding,high reliability and flexible control.Based on the advantages of solid rotor induction motor and toroidal winding structure,this paper proposes a novel solid rotor induction motor with toroidal winding(NTWSRIM)by changing the connection method of the stator toroidal winding,and analyzes its mechanism,equivalent circuit modeling,electromagnetic characteristics analysis,multi-objective optimization,and implementation research on verification.The main research contents are as follows:1.An NTWSRIM is proposed and its structure and mechanism are analyzed.Firstly,the structure of NTWSRIM is given.Based on the structure size of a traditional solid rotor induction motor,the preliminary structure parameters of NTWSRIM are obtained.Secondly,the connection mode of the novel toroidal winding is analyzed,and the differences between the novel toroidal winding and the traditional winding are discussed.Finally,the working mechanism of NTWSRIM is analyzed according to the magnetic field distribution of the motor at different electrical angles,the phenomenon of "pole multiplication" realized is explained.2.The equivalent circuit model of NTWSRIM is established,its electromagnetic characteristics are analyzed and verified by finite element method.Considering the particularity of the novel toroidal winding structure,based on the traditional penetration depth method and multi-layer theory method,the penetration depth method and multilayer theory method formula applicable to NTWSRIM are given respectively,the corresponding iterative program block diagram is compiled,the equivalent circuit model parameters are solved,the equivalent circuit model of NTWSRIM is established,and then the motor performance is calculated;according to the electromagnetic parameters of the motor,the electromagnetic parameters of the motor are calculated The two-dimensional finite element model is established,and the analytical results of the equivalent circuit model are compared with those of the finite element simulation.The results show that the finite element simulation results are consistent with the analytical results of the equivalent circuit model,and the correctness of the equivalent circuit model is verified.3.The NTWSRIM prototype is manufactured and the prototype experiment is carried out.A prototype of NTWSRIM is preliminarily manufactured,the corresponding experimental platform is built,and the no-load and loading experiments of the prototype are carried out.By comparing the analytical,simulation and experimental results,the correctness of the equivalent circuit model and the finite element model is verified,which provides a certain reference value for the analytical calculation of the solid rotor induction machine with ring winding.At the same time,the prototype experiment also proves the feasibility of NTWSRIM and the correctness of its working mechanism.4.The influence of NTWSRIM stator and rotor structure parameters on motor target performance is analyzed.Starting from the stator and rotor,the slot width,slot height,slot width,slot radius,air gap,rotor copper layer thickness and other structural parameters are selected as a single variable,and their influence on the average output torque,power factor,torque fluctuation and other performance are analyzed respectively,and the structural parameters that have a greater impact on the target performance of the motor are obtained objective optimization design provides a certain reference value.5.The multi-objective optimization design of NTWSRIM is completed.In view of the disadvantages of NTWSRIM,such as low output torque and low power factor,the optimization algorithm Taguchi method is adopted to carry out multi-objective optimization design of NTWSRIM.Taking the average output torque,power factor and torque fluctuation as the optimization objective,the optimization parameters which have great influence on the objective characteristics are selected,the range of parameter influence factors is established,and the orthogonal matrix of optimization objective and parameter influence factors is established.Through the finite element solution,the influence proportion of parameter influence factors on the target performance of NTWSRIM is analyzed,and the overall performance is optimized a group of motor structure parameters combination.The simulation results show that the average electromagnetic torque of NTWSRIM increases from 0.52 Nm to 10.25 Nm,and the torque fluctuation decreases by 87.8%,and the power factor increases from 0.336 to 0.874.