Optimal Design And Control Of Printed Permanent Magnet Synchronous Motor

The Printed PMSM is an important branch of the stator coreless AFPMSM.It has the advantages of short axial distance,high power density,low core loss and no cogging torque;At the same time,the stator adopts PCB technology,which has high production accuracy,low cost,and is suitable for mass production.This type of motor is mainly suitable for vertical axis wind turbines,aerospace,robot joints and other occasions that require short axial length and high power density.In the development trend of clean energy and industrial automation,the research of the Printed PMSM has high strategic significance.Firstly,the expression of air gap magnetic density is given by the analysis of the magnetic circuit of the unit structure of the single rotor-single air gap-single stator of the printed PMSM.Then,according to the principle of armature reaction,the expressions of induced electromotive force and electromagnetic torque are derived.Meanwhile,the basic sizes of the motor are determined by comprehensively considered factors such as production cost,production difficulty and dynamic performance.In the rotor design of Printed PMSM,simulation comparative analysis of the sector,bar,round,and halbach array permanent magnets is carried out,and the round permanent magnet is selected.Magnetic circuits,both main flux and leakage flux,of single-rotor and double-rotor structures are comparatively analyzed,and also verified by finite element simulation,and the double-rotor structure is selected;Aiming at the problem of the leakage flux of the double-rotor,there are three solutions: increasing the thickness of the back iron,increasing the ring magnetic bridge,and increasing the bar magnetic bridge,after simulation comparative analysis and comprehensive consideration,the solution which increases the thickness of the back iron is selected.In the stator design of Printed PMSM,effective conductor bars are taken as basic elements,and the influence of effective conductor bar arrangement on back-EMF harmonics is analyzed.After comprehensive consideration of stator current carrying capacity and harmonic suppression,the equal spacing arrangement of effective conductor bars is selected.According to the definition of winding inductance and considering safety and performance,the spiral winding structure is selected.At the same time,in order to increase the magnetic flux area and winding inductance,the inner end wire is used to minimize the area of the inner circle.Aiming at the problem of low PCB utilization,the effective conductor bars are parallel connected and the outer end lines are staggered arranged,which makes the printed winding modularized and the winding inductance improved.Afterward,the design of Printed PMSM is simulated and verified by establishing the simulation model.For further verification of the effectiveness of the design,the prototype was made and the related parameters of the prototype are basically the same as the simulation.FOC is taken to drive the prototype and the experimental results show that the prototype has rapid speed response and dynamic regulation performance.Aiming at the problem of phase current pulsation in Printed PMSM,its principle is analyzed and it can be suppressed by increasing the winding equivalent circuit inductance value and reducing its cut-off frequency.The related experimental results show that this method can effectively suppress the phase current pulsation.Aiming at the problem of leakage flux in Printed PMSM,combined with the dependence of FOC on rotor position information,a method for detecting rotor position information basing on rotor leakage flux is proposed.The related experimental results show that rotor position information with good linearity and related motor fault information can be obtained by detecting rotor leakage flux.There are 91 figures,12 tables,and 79 references in this thesis.