Design Of High-Temperature Superconductor Flux-Switching Machine

The enlargement of wind power generation system is one of effective measures to reduce operating cost of wind power industry,and has become the research hotspot in the field of wind power.Aiming at the large size,heavy weightand high mechanical failure rate of large power wind power system,this paper introduces high temperature superconducting material to stator excitation motor as exciting winding,which not only plays the characteristics of DC current applicability of High-Temperature Superconductor(HTS)winding,but also avoids necessary rotary connection required by traditional rotor exciting high temperaturesuperconducting motor,so as to further propose a high power density and high temperature superconducting excitation Flux-Switching Machine(FSM)as well as direct-driven wind power generation system.This paper studies the new motor around the following contents:1.Referring to the idea of stator permanent magnet motor that permanent magnet body is placed on stator side to generate air-gap field,and combining the advantages of lager power density,high efficiency and easy realization of modularized design of FSM,this paper puts forward modularized radial magnetic field high temperature superconducting excitation FSM topological structure combining traditional electrical excitation FSM and high temperature superconducting technology,and adopts finite element method to analyze electromagnetic performance.2.In order to guarantee performance of high temperature superconducting wire so as to make it operate at superconducting stage,this paper designs and manufactures a static sealing high temperature superconductor runway-type supe rconducting magnet with vacuum jacket,which provides guarantee for stable ope ration of high temperature superconducting field winding.3.This paper builds a set of static sealing high temperature superconductor low temperature cooling system comprised of cold box,self-pressurized feeding dewar,self-pressurized recovery dewar,vaporizer and vacuum pump,which guarantees superconducting performance of high temperature superconducting wire.4.This paper,based on motor parameters acquired by finite element calculation and runway-type high temperature superconducting magnet,designs and manufactures a set of prototype of static sealing high temperature superconducting excitation FSM.The prototype eliminates parts with complicated structure such as low temperature transmission coupling device,high strength torque tube and slip-ring brush required by dynamic sealing superconducting motor,reduces manufacturing cost and processing difficulty of high temperature superconducting motor,and meanwhile improves operation reliability of motor.5.This paper,based on the low temperature cooling system built,sets up wind power generation test platform of static sealing high temperature superconducting magnetic FSM,and carries out united test for cooling performance of low temperature cooling system and electromagnetic property of high temperature superconducting FSM.The test results show the inlet temperature of runway-type high temperature superconducting magnet can be cooled to 63K;superconducting field winding by bismuth high temperature superconducting wire operates stably at superconducting status;meanwhile,the generator end voltage test results match with finite element calculation results,verifying correctness of theoretical analysis.