Performance Analysis And Structural Optimization Of High Temperature Superconducting Motor

The high-temperature superconducting machine has the characteristics of high work-to-weight ratio and high efficiency,and can be applied to special occasions that cannot be satisfied by some conventional motors,such as ship propulsion,wind power generation,etc.Which has very important research significance,and therefore,in recent years,The research of conductive machine has become a research hotspot in the field of scientific research at home and abroad.In this thesis,a superconducting machine is designed.From the structural selection of the motor,the key design parameters of the superconducting machine are determined by the theory and finite element method.At the same time,the AC losses analysis and calculation of the stator superconducting coil are carried out,and the motor structural parameters are optimized.Two aspects have been studied in depth,the main contents of which are as follows:From the perspective of the structural characteristics of the superconducting machine and the special performance of the superconducting winding,the motor to be studied is selected,the superconducting coil is selected for the stator winding,and the fully immersed motor is used as the research direction for the cooling method.The speed is 6000 rpm and the rated power is 100 kW.Next,the design of the fixed rotor structure is combined with the design experience of the traditional motor and the superconducting machine constraints to determine the electromagnetic structure parameters.The final designed motor is a two-stage motor,the stator slot adopts a rectangular slot,and the windings are arranged in two layers.The superconducting coil is designed as a racetrack type structure.After determining the completion of all motor structural parameters,the finite element software is used to establish the simulation model of the superconducting machine.The performance of the motor is simulated and analyzed.The performance of the designed motor is verified by the no-load and load aspects.The motor is mainly analyzed.Speed,torque versus time,and magnetic field distribution,armature current changes.Then according to the principle and classification of the AC loss of the coil,combined with the commonly used AC loss calculation model,the Norris model is selected as the numerical calculation model.In the calculation process of the AC loss,the calculation process is based on the magnetic field distribution of the coil and the characteristics of the motor operation.Appropriate discrete processing is performed to simplify the calculation while ensuring the accuracy of the calculation results.Through the finite element simulation software COMSOL three-dimensional simulation module,the influence of parameters such as coil turns,external field and flow size on the AC loss of the three-dimensional structure of superconducting coils is analyzed.Combined with the numerical calculation results,the corresponding measures to reduce AC loss are proposed.Finally,the motor performance is optimized by analyzing the motor structure parameters and winding arrangement.The effects of different stator slot parameters,number of rotor slots,air gap size,relative position of the coil and rotation angle on the torque,air gap magnetic field and maximum magnetic field distribution are analyzed.The optimized motor parameters are determined.The simulation analysis is compared with the performance of the originally designed motor,and several performance indicators are found to be improved.