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In recent years, with the continuous improvement and improvement of the performance of permanent magnet materials, especially the improvement of thermal stability and corrosion resistance of NdFeB permanent magnet materials and the gradual reduction of price and the further development of power electronic devices, rare earth permanent magnet motors It has been used more and more widely in defense, industrial and agricultural production and daily life. The permanent magnet motor is excited by permanent magnets. The electromagnetic field distribution inside the motor is complex. The traditional equivalent magnetic circuit method will bring a large error. To ensure the accuracy of calculation, the finite element method is used to calculate the internal electromagnetic field of the motor. Calculation. The numerical analysis using the finite element method requires mastering the finite element method and compiling the calculation program. The work is complicated and the precision is not high, and the post-processing ability is limited. ANSYS is one of the most widely used and most convenient general-purpose finite element analysis software. It integrates structure, heat, electromagnetic, fluid and acoustics. It can perform multi-physics coupling calculation and has extremely powerful front and back. Processing function. In use, the user only needs to input the problem to be calculated, and the result can be obtained, and the result can be further developed and used without knowing the detailed process of solving, and no need to master relevant skills and compile any 1994-2012 ChinaAcademicJournal The program is greatly convenient to use, saving time and effort. Specific to the motor design, any structure, any form of permanent magnet motor, as long as the model is input into ANSYS can be solved, through the post-processing to obtain magnetic density distribution, magnetic field distribution, magnetic field strength distribution, electromagnetic force distribution and torque distribution The color cloud map and unit list are very straightforward and computationally accurate.
In this paper, the design of high-speed permanent magnet synchronous generator for a marine equipment is described in detail. The specific process of electromagnetic field analysis in the motor is described in detail, and the test results of the prototype are given.
2 Performance index and basic structure of permanent magnet synchronous generator The rare earth permanent magnet generator drives a set of pulse loads through the converter device, and the motor is required to output two sets of three groups of voltages *33V (phase voltage), the power is 2kW, and the voltage change rate For ±2./., the motor speed is 24000r/min, and the volume and weight requirements are extremely strict. The motor adopts R2Co "(samarium cobalt 2:17) permanent magnet, the rotor adopts 6-pole pole structure, plus stainless steel fastening sleeve, and the stator adopts 36-slot structure stator winding output frequency of 2000Hztttp:" 6 version of Multiphysics module Performing electromagnetic field analysis of the motor can be divided into three phases: pre-processing, running calculation and post-processing.
This phase includes defining the unit type, establishing an analytical model, and defining the properties of each part of the material. The unit type is defined as an electromagnetic axis (Electromagnetic) axisymmetric type. The rare earth permanent magnet generator designed in this paper is a 6-pole symmetrical structure, and its electromagnetic field analysis model adopts a pole distance range, as shown. The model can be drawn using the user interface Workplane provided by ANSYS, or it can be drawn by Prc/E, UG or AUTOCAD and then read in.
Input properties of various materials: magnetic permeability and coercivity of permanent magnet materials, magnetic permeability of non-magnetic materials (air, coil, magnetic separation), stator core (silicon steel sheet) and rotor yoke (electrical pure iron) The magnetization curves are then assigned to the model one by one, and then the material areas of the model are merged into one, as shown.
Conditions, applied incentives, and operational calculations. The entire model is selected for meshing as shown. Then, the armature portion area is set as an armature, and the inner and outer arcs are set to be parallel to the boundary of the magnetic lines of force. If the load condition is solved, current density excitation is applied to the groove portion, and finally the operation calculation is performed.
Meshing includes drawing magnetic density distribution maps, magnetic field lines, magnetic field strength maps, and solving electromagnetic forces or electromagnetic torques. 5, 6 are the magnetic density, magnetic field strength, magnetic field line distribution diagram when the motor is under no load, and the values ​​of each unit can also be listed by a list method. Through the graph, the magnetic density distribution of each part, the magnitude of the magnetic field strength, the calculation of the no-load operating point of the magnetic steel and the coefficients required in each electromagnetic calculation are calculated, and the load situation is similar, so that it is intuitive and clear. Complete the electromagnetic design of the motor.
Magnetic density distribution diagram The design of rare earth permanent magnet synchronous generator in this paper, the numerical calculation of motor electromagnetic field by AN~SYS, the completion of the 3.2 operation processing stage includes: mesh division, set armature, plus boundary The task is to meet the requirements of the motor voltage change rate of soil 2 7. The sample magnetic field strength distribution map magnetic field line machine test no-load output voltage and load output voltage as shown in 8,. The hollow phase load voltages are 33.41V, 32.73V, 32.81V, respectively. The load phase voltages are 33.42V, 32.95V, and the load voltage waveform is ANSYS general finite element analysis software. It has extremely strong pre- and post-processing functions and high Analysis accuracy, and easy to use, often used in structural and heat transfer analysis, can also be used in electromagnetic field analysis.
The application of ANSYS to permanent magnet motors is extremely convenient and the results are straightforward, making the permanent magnet motor design more accurate and intuitive.
For the design of large permanent magnet motors or permanent magnet motors with high temperature requirements, ANSYS' electromagnetic electromagnetic and electrothermal multiphysics coupling analysis functions will play a big role.
September 23, 2021