Optimized Design Of Direct Drive Disc Motor In Wind Turbine Yaw System

With the development of industry,global warming has become a hot issue at present,and clean energy such as wind energy and solar energy has greatly developed into a hot spot for current energy development.The earliest horizontal axis wind turbines used in commercial applications are the mainstream of wind turbines,and their technology is relatively mature.However,there have been many problems.For example,the complicated structure of various components makes maintenance difficult and requires regular replacement of lubricating grease.High manufacturing costs,long-term yaw will cause damage to the wind turbine tower,affecting the life of the blades in the fan.Through the research on the deficiency of the traditional yaw device system,the research group proposed a new type of wind magnetic levitation yaw system.The system introduces the magnetic levitation technology and the disc motor technology into the yaw system,which greatly changes the structure of the yaw system,greatly reduces the yaw loss,has the characteristics of simple structure,good maintenance and no need for regular lubrication,and It can improve the problem of blade tremor damage and tower side bending caused by the normal operation of the fan.The main driving component for suspension and yaw in the magnetic levitation yaw system is the disc motor.As a new type of motor with high performance and high reliability,the disc motor simplifies the system weight because it no longer needs the mechanical deceleration structure.The mechanism of the whole magnetic levitation system,at the same time,the motor has the characteristics of stable operation at low speed,low vibration and noise,and compact structure.It is in line with the requirements of miniaturization and light weight of the fan cabin.The focus of this paper is to design and optimize the disc motor.First of all,this paper briefly introduces the types of fan yaw system and disc motor.By comparison,it is determined that the type of disc motor used is disc synchronous motor.Then the stator and rotor parameters are calculated,the fractional slot winding method and specific parameters are determined,and the wiring diagram of each phase principle is obtained to determine the model of the fixed rotor core silicon steel sheet.The principle of 3D electromagnetic field analysis is introduced.The 3D simulation model of the disc motor is established in Maxwell 3D.From the perspective of electromagnetic field,the 3D model of the disc motor is analyzed by finite element analysis,and the static magnetic field and transient magnetic field of the motor are analyzed.Performance under.It is found that the main problem of the motor is that the cogging torque is too large.Based on this,the optimization design is carried out.The optimization analysis is carried out from three aspects: changing the slot width,adopting the stator chute and the number of slots.The simulation experiment was carried out to obtain the cogging torque waveform in each case.The degree of weakening of cogging torque by each method was compared and analyzed,and the feasibility and optimization effect were verified.