Structure Optimization And Performance Analysis Of Superconducting Excited Synchronous Generator

Superconducting Generator is a kind of high-efficiency motor with broad development prospects.The structural optimization of the superconducting excitation winding and the change of the thickness of the ferromagnetic shield will directly affect the performance of the motor.Therefore,the optimization of the excitation winding and the thickness of the ferromagnetic shield of the superconducting excitation synchronous motor is of great significance.At present,there are relatively few studies on the influence of ferromagnetic shielding thickness and field winding optimization on the motor magnetic field.Aiming at the above problems,this thesis conducts an optimization analysis on the excitation winding and ferromagnetic shield thickness of a superconducting synchronous motor,and basically achieves the optimization purpose through comparative analysis.According to the electromagnetic properties of superconducting materials,a mathematical model of superconducting tapes was established,and a stacked racetrack excitation winding model was further established.The electromagnetic performance and structure of the superconducting field winding are optimized by using the geometric figure method and genetic algorithm,and the electromagnetic performance of the optimized field winding is improved through analysis,and the amount of superconducting tape is reduced at the same time.The effects of different thicknesses of ferromagnetic shielding on the magnetic density distribution in the motor and perpendicular to the excitation winding were analyzed and compared,and the ferromagnetic shielding optimization scheme with a thickness of 30 mm was finally selected by comparing the magnetic density distribution under different thicknesses and the analysis of back electromotive force..The weight of the motor is reduced and the manufacturing cost is saved.The performance of the optimized superconducting generator is verified and analyzed,including voltage and current output characteristics,air gap magnetic density distribution,etc.The electromagnetic torque and ferromagnetic loss before and after optimization are analyzed and compared.The analysis shows that the total harmonic content of the optimized current and voltage waveforms is less than 1%,the quality of the output waveform is better,and the optimization purpose is better achieved.The three-dimensional magnetic density distribution of the superconducting generator is calculated,the characteristics of the radial air gap magnetic density distribution are analyzed,and the eddy current loss distribution law of the ferromagnetic shield before and after optimization is calculated.After optimization,the ferromagnetic loss only increases by 63 W.The electromagnetic torque curves of the superconducting generator before and after optimization are compared.After optimization,the average torque increases by 21.6,the pulse amplitude decreases by 1.6,and the torque fluctuation decreases by 0.5%,and the optimization effect is good.