Research And Energy Efficiency Analysis Of A New Type Of Ironless Permanent Disk Motor For Ducted Drones

In recent years,the ironless permanent disk type motor has attracted much attention due to its series of advantages such as short axial dimension,high power density,strong overload capability,and no cogging torque.Scholars at home and abroad have also proposed innovative structures for many disc motors.The main purpose is to reduce the energy consumption of the disc motor,improve the efficiency of the motor,and reduce the negative impact of noise vibration by reducing the cogging torque.This paper proposes a magnetic suspension disc motor for use on a drone that has a flat structure requirement for the motor.The driving motor adopts an iron-free permanent disk type motor with an intermediate rotor structure.The stator part of the motor has no iron core,and the winding is wound into a disk to perform epoxy resin filling;the rotor permanent magnet is formed into a segmented oblique pole structure and glued into a disk.After the model is built to simulate the energy efficiency of the disc motor,the structure is optimized,and the single-rotor single stator non-core permanent disk motor is removed,and the magnetic suspension technology is used to solve the problem of single-sided force.The magnetic interference analysis of the magnetic suspension suspension part and the disk motor is carried out to determine the minimum mass of the driven part of the drone.Finally,the coupled analysis of the magnetic field and vibration noise is performed on the designed disc motor.The main contents are as follows:The first chapter introduces the research background and significance of the disc-type ironless permanent magnet synchronous motor,discusses the structure classification of the disc motor and the application of various disc motors,and analyzes the research progress of the disc motor at home and abroad.The second chapter introduces the basic structure and characteristics of the ironless permanent disk motor.It introduces several kinds of permanent magnet materials commonly used in disc motors,and carries out the theoretical design calculation of the permanent magnets of the motor.The mechanism of winding loss is introduced.And the theoretical design calculation of the stator winding of the disc motor.The third chapter expounds the theoretical basis of the electromagnetic field of the motor,proposes the basic concept of the finite element analysis method,gives the three-dimensional model of the ironless permanent disk motor,introduces the main magnetic circuit structure of the disk motor,and introduces the coreless disk.The magnetic circuit of the motor was designed and calculated.The fourth chapter designs and calculates the structural parameters of the stator,winding and permanent magnet of the iron-free permanent disk motor with intermediate rotor structure,and optimizes the structure of the disc motor at the armature and permanent magnet.The three-dimensional model of the coreless disk motor is used for electromagnetic analysis of the coreless disk motor.The finite element analysis software is used to simulate the no-load back EMF,flux linkage simulation,speed simulation,torque simulation,loss simulation and efficiency simulation.And comparing the simulation results with the theoretical design calculation results,the theoretical feasibility of the design of the coreless disk motor is proved.The temperature simulation of the coreless disk motor is carried out.In the fifth chapter,based on the comprehensive analysis and design of the intermediate rotor structure without iron core permanent disk motor,the quality of the disc motor that has achieved the expected function is optimized,and the concept of single stator single rotor structure disc motor is introduced.Three-dimensional model of stator single rotor without iron core permanent disk motor,and single-side force calculation and analysis of single-stator single-rotor disk motor;for the solution of single-sided force,introduce the theory of magnetic levitation technology,introduce magnetic suspension structure;analysis The magnetic field interference between the disc motor and the magnetic suspension suspension ensures the quality requirements of the magnetic suspension drone.Finally,the construction of the core model of the drone and the production of the physical object are completed.The sixth chapter analyzes the cause mechanism of vibration noise generation,and analyzes the modal analysis and electromagnetic vibration coupling finite element analysis of single stator single rotor non-core permanent disk motor.The vibration velocity curve and vibration displacement curve are obtained through analysis to determine the motor.Feasibility in design.