Design And Analysis Of Field-Modulated Transverse-Flux Magnetic Gear

Mechanical gears are extensively used for speed change transmission.However,because their inputs and outputs need to contact each other,it is inevitable to have the disadvantages of large noise,need of lubrication,high maintenance cost and unsuitable for some special occasions.The emergence of magnetic gears solves these above problems.The magnetic gears offers significant advantages of reduced acoustic noise,minimum vibration,free from maintenance,improved reliability,inherent overload protection,and physical isolation between the input and output shafts.In this thesis,a novel transverse-flux magnetic gear with skew slots(TFMGSS)and a novel stator-excited axial-flux magnetic gear(SEAFMG)are proposed.This paper studies these novel magnetic gears from the following contents:1.The operating principle of TFMGSS was deduced theoretically,and the theoretical analysis was verified by finite element method.Then,it is optimized by two aspects: rotor design and stator design,and its optimal design parameters are obtained.According to the optimal design parameters,the torque transmission performance of TFMGSS is analyzed and compared with the surface-mounted transverse-flux magnetic gear(SMTFMG).Finally,the flux leakage characteristics of transverse-flux magnetic gear is analyzed.2.Based on the field-modulation principle and the disadvantages of rotor-excited magnetic gears,the concept of stator-excited magnetic gears is proposed.The topologies is described and the operating principle is analyzed.Two types of stator-excited magnetic gear,SE-1 and SE-2,are obtained,and SE-2 is selected as the focus in this thesis.From the perspective of air gap magnetic flux density and magnetic field distribution,the working mechanism of the stator-excited magnetic gear is further explained.3.Topology description,operating principle analysis and optimization design are performed on SEAFMG,and its optimal design parameters are obtained.According to is optimal design parameters,the torque characteristics are analyzed using the finite element method.4.Based on the research status of loss calculation at home and abroad,the iron loss calculation model and permanent magnet eddy current loss calculation model suitable for TFMGSS and SEAFMG are proposed and verified.Based on this,the loss and efficiency characteristics of TFMGSS and SEAFMG are analyzed.