| The high-speed motor has the characteristics of high power density,small volume,and high speed,which can be directly connected to loads.It is widely used in the occasions of flywheel energy storage,high-speed machining,high-speed centrifuges and etc..With the development of science and technology,the requirements for the performance of high-speed motors have been gradually increased.The high-speed motor mainly operates at high speeds and high frequencies,its iron cores made of silicon steel sheets thus will produce large core loss,resulting in reduced motor efficiency and heating problems.As a new type of green material,the amorphous alloy material has the advantage of low loss at high frequency,and can effectively improve efficiency when it is used in the electromagnetic equipment.However,the amorphous alloy material has not yet been widely used,and scholars at home and abroad have not done enough research on the amorphous alloy motor.Therefore,aiming at high efficiency and low temperature rise,this thesis conducts research on the structure design,the performance analysis and the temperature field analysis of an amorphous high-speed permanent magnet synchronous motor.The specific research contents are as follows:a.The structure and size of the amorphous alloy high-speed permanent magnet synchronous motor are designed according to the performance indicators and design requirements,including the main size of the motor,the pole-slot combination,the stator and the rotor,etc..The influence of various structural parameters on the performance of the motor such as the magnetic density,the cogging torque and the efficiency are also analyzed.Finally,the design scheme of the motor is determined.b.The no-load back EMF and the flux density of the motor with amorphous and silicon steel stator are compared and analyzed in the finite element software.Then,the torque,the current and the flux density distribution of the two motors are compared under the rated conditions of 20 kW and 35000r/min,and the core loss and the efficiency of the two motors under the same working conditions are analyzed and calculated to verify the advantages of low iron loss and high efficiency of amorphous alloy materials.Finally,the effects of the sheath thickness,the sheath material and the pole eccentricity on motor performance are calculated and analyzed.c.The steady-state temperature field of the motor under different working conditions are analyzed by using the finite volume method.The three-dimensional global model of the motor is established by using the drawing software,and the pre-processing work such as the mesh generation,the loss calculation and the thermal parameter calculation are completed.Then,the influence of different core materials and sheath materials on the temperature rise of the motor under rated conditions is analyzed,and the temperature distribution of each part of the motor is explored.Finally,the steady-state temperature field of the silicon steel and the amorphous motor at low speed is analyzed,and the influence of the amorphous alloy material used in the stator on motor temperature rise is also explored.d.The 20 kW amorphous prototype is manufactured and the experimental platform is built for experimental test.The winding resistance of the motor and the no-load back-EMF at different speeds are measured,the load operation test is performed,and then the experimental data is recorded and compared with the finite element simulation results to verify the accuracy of the finite element analysis model.Finally,the temperature rise of the motor at different speeds are measured,and the temperature rise data at the end of the motor winding is recorded and compared with the temperature field simulation data to verify the accuracy of the temperature field simulation results. |
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