Research On Design And Optimization Of Hybrid Excitation Bearingless Switched Reluctance Motor For Flywheel Energy Storage

The contradiction between resource consumption and environmental protection is increasingly prominent,and the study of new energy and energy-saving technology has become a hot trend.As a necessary part of the former,energy storage technology has also become one of the research hotspots.Flywheel energy storage,as a unique physical energy storage method,has the advantages of high energy density,high instantaneous power,excellent charge-discharge performance and safe and reliable use.Bearingless Switched Reluctance Motor(BSRM)is very suitable for flywheel energy storage system because of its simple structure and good fault-tolerance.But the coupling and loss of traditional BSRM make its application more difficult,so it is very important to study the new type of BSRM for its high integration,low loss and high reliability.Firstly,a new structure scheme of magnetic suspension flywheel energy storage system is put forward,and its structure is briefly analyzed.Then,the topology structure and operation mechanism of bearing support system are briefly analyzed.At the same time,the operation mechanism of Hybrid Excitation Bearingless Switched Reluctance Motor(HEBSRM)is introduced and analyzed,the mathematical model is analyzed,and the basic structural parameters are designed.Secondly,based on the initial structure parameters,the electromagnetic characteristics of HEBSRM are modeled and analyzed,and the calculation method of HEBSRM core loss is introduced.The 3-D loss model is established,and the iron loss of HEBSRM at different speeds is simulated and analyzed,and the iron loss distribution of HEBSRM at different speeds is obtained,which lays the foundation for the study of temperature field.Then,the theory of temperature field analysis is explained.Based on the loss analysis,the 3-D finite element model of HEBSRM is established,and the temperature distribution of HEBSRM under natural wind cooling and vacuum conditions is analyzed.Finally,the basic concept of optimization design is introduced,and the performance requirement of flywheel energy storage system is analyzed.Based on this,the optimization goal of motor is put forward,and the appropriate decision variables and the range of values are selected through sensitivity analysis.The optimization of the structural parameters is carried out by using the intelligent optimization algorithm,and the performance of the optimized HEBSRM is analyzed.At the same time,the feasibility of the new HEBSRM and the correctness of the optimization design method are verified by machining the correlative prototype.