Design And Research Of Permanent Magnet Synchronous Motor With Built-in Outer Rotor For Hois

The low-speed and high-torque permanent magnet synchronous motor has the advantages of high power density,simple structure and high efficiency,and is widely used in industrial production.Due to the development of power electronics technology and the breakthrough in the performance of permanent magnet materials in recent years,permanent magnet synchronous motor has become the focus of research and application.In this paper,aiming at the special working situation of mine hoisting,the design and research of a certain type of outer rotor permanent magnet synchronous motor inside hoist is carried out.The motor is built in the drum,and the working winding is assembled on the inner stator.The outer rotor and the hoist drum become a whole,eliminating the intermediate devices such as the reducer.It is a new type of electromechanical integration equipment.It is a new type of equipment for electromechanical integration.According to the design index of outer rotor permanent magnet synchronous motor inside hoist,the electromagnetic structure scheme is designed in this paper.Using the method of multi-physics simulation analysis,the electromagnetic performance,motor loss under multiple working conditions,temperature rise and heat dissipation of the outer rotor permanent magnet synchronous motor are designed and studied respectively.The main research contents are as follows:(1)Electromagnetic structure design and electromagnetic coupling analysis.The structure size of the stator and rotor,permanent magnet and magnetic circuit structure of the motor are designed,and the finite element model is established for Maxwell electromagnetic simulation to obtain the electromagnetic field distribution status and electromagnetic output performance of the motor.The results show that the electromagnetic field distribution is uniform and reasonable,and the output performance meets the requirements.At the same time,the multi-variable optimization of the cogging torque is carried out to reduce the cogging torque and torque ripple.The torque ripple decreased from 25.34% to 10.87%,a reduction of 57.10%.It improves the stability of electromagnetic design.(2)Research and analysis of motor loss under multiple working conditions.The loss of external rotor permanent magnet synchronous motor is classified and studied by simulating different load conditions.The loss calculation model is established.Through simulation calculation,the size and distribution of core loss,winding copper loss and eddy current loss of permanent magnet in the motor are obtained.At the same time,the change law of various loss values of the motor is studied when the load changes.It provides a basis for the analysis of motor temperature field.(3)Research on temperature rise and heat dissipation of the motor in operation.The scheme of forced water cooling circumferential cooling channel is designed,and the temperature field of the motor is simulated through Fluent.The temperature changes of winding,stator,permanent magnet and rotor are analyzed in detail,and the influence of cooling flow changes on the heat dissipation effect of the motor is explored.At the same time,the temperature changes of the internal components of the motor under the short-time overload condition are simulated,and the reliability of the permanent magnet material and internal insulation is verified to ensure that the motor can work safely in practice.(4)Trial production of prototype and comparative analysis of experimental data.On the basis of multi-physics simulation analysis,a prototype is made according to the electromagnetic design scheme,and the electromagnetic performance test and temperature rise test are carried out for the external rotor permanent magnet synchronous motor.Comparing simulation data with experimental data,the maximum error between electromagnetic performance testing and simulation is 6.34%,and the maximum error between temperature testing and simulation is 3.11%.It indicates that the simulation is accurate and the electromagnetic design scheme is reasonable and feasible.Through the simulation analysis and optimization of multi-physics such as electromagnetic coupling,loss and heat dissipation of the motor,this paper has completed the design and prototype testing verification of the outer rotor permanent magnet synchronous motor inside hoist.The research results are of great significance for the transformation of traditional motors and the development of new built-in mine hoists in the mine lifting equipment industry.