In recent years, with the continuous improvement and perfection of the performance of permanent magnetic materials, especially the improvement of the thermal stability and corrosion resistance of NdFeB permanent magnet materials and the gradual reduction of the price and the further development of power electronic devices, rare earth permanent magnet motors It has been increasingly used in defense, industrial and agricultural production and daily life. The permanent magnet motor uses permanent magnets to excite the magnets. The distribution of the electromagnetic field inside the motor is more complicated. The analysis using the traditional equivalent magnetic circuit method will bring larger errors. In order to ensure the accuracy of the calculation, the finite element method is generally used to numerically simulate the internal electromagnetic field of the motor. Calculations. The finite element method is used for numerical analysis. It is necessary to master the finite element method and compile the calculation program. The work is cumbersome and the precision is not high, and the post-processing capacity is limited. ANSYS is one of the most widely used and most convenient general-purpose finite element analysis software. It integrates structure, heat, electromagnetism, fluid, and acoustics. It can perform multi-physics coupling calculations and has extremely powerful front and rear. Processing function. In use, the user only needs to input the problem to be calculated, then the result can be obtained, and the result can be further developed and used without knowing the detailed process of the solution, and it is not necessary to master the relevant skills and prepare any 1994-2012 China Academic Journal. The program greatly facilitates use and saves time and effort. Specific to the motor design, regardless of any structure, any form of permanent magnet motor, as long as the model input to ANSYS can be solved, through the post-processing to obtain the magnetic density distribution, magnetic field distribution, magnetic field strength distribution, electromagnetic force distribution and torque distribution The color cloud charts and unit lists are very intuitive and highly accurate.
In this paper, the design of a high-speed permanent-magnet synchronous generator for a certain offshore equipment is used to explain in detail the specific process of the analysis of the electromagnetic field in the motor using ANSYS, and the prototype test results are given.
2 Performance index and basic structure of permanent magnet synchronous generator The rare earth permanent magnet generator drives a group of pulse loads through the converter equipment, requiring the motor to output two sets of three groups of voltages *33V (phase voltage), power of 2kW, voltage change rate For ±2./., the motor speed is 24000r/min, and the volume and weight requirements are extremely strict. The motor adopts R2Co "(SrCo2:17) permanent magnet, the rotor adopts 6-pole-tile structure, plus stainless steel clamping sleeve, the stator adopts 36-slot structure, stator winding output frequency is 2000Hztttp:" 6 version of Multiphysics module Electromagnetic field analysis of the motor can be divided into three stages: pre-processing, operation calculation and post-processing.
This phase includes the definition of unit types, the establishment of analytical models, and the definition of the nature of the materials in each section. The cell type is defined as Electromagnetic Axisymmetric. The rare earth permanent magnet generator designed in this paper has 6 pairs of pole symmetrical structures, and its electromagnetic field analysis model adopts a polar distance range, as shown. The model can be drawn using the user interface Workplane provided by ANSYS. It can also be drawn by Prc/E, UG, or AUTOCAD and then read in.
Input properties of various materials: magnetic permeability and coercive force of permanent magnetic materials, permeability of non-magnetic materials (air, coils, magnetic spacers), stator core (silicon steel sheet) and rotor yoke (electrician pure iron) The magnetization curve is then given to the model one by one, and then the material areas in the model are merged into one, as shown.
Conditions, incentives, and running calculations. The entire model is selected for meshing as shown. Then set the area of ​​the armature to the armature, and set the two arcs inside and outside to be parallel to the boundary of the magnetic force line. If the load is solved, the current density is stimulated in the slot and the operation calculation is performed.
Mesh subdivision includes drawing magnetic density distribution maps, magnetic force diagrams, magnetic field strength maps, and solving electromagnetic forces or electromagnetic torques. , 5, and 6 are the magnetic density, magnetic field strength, magnetic force distribution diagram when the motor is unloaded, and the values ​​of each unit can also be listed by a list method. The figure can clearly see the density distribution of each part, the magnitude of the magnetic field strength, calculate the no-load working point of magnetic steel and the required coefficients in each electromagnetic calculation. The load situation is similar to this, and thus it is intuitive and clear. Complete the electromagnetic design of the motor.
The magnetic density distribution diagram This paper is about the design of rare earth permanent magnet synchronous generator. The numerical calculation of the electromagnetic field of the motor is done through AN~SYS. It is well done. 3.2 The operation processing This phase includes: meshing, setting armature, adding boundary The metering task satisfies the requirements for the motor voltage change rate of earth 2 7. The magnetic field intensity distribution diagram of the magnetic field diagram machine tests the no-load output voltage and the load output voltage as shown in Fig. 8. Figure hollow load phase voltage is 33.41V, 32.73V, 32.81V. The load phase voltage is 33.42V, 32.95V, load voltage waveform ANSYS general-purpose finite element analysis software, with strong before and after processing and higher Analytical accuracy, and ease of use, are often used for analysis of structures and heat transfer, and can also be well applied in electromagnetic field analysis.
The application of ANSYS to permanent magnet motors is extremely easy to use and the results are straightforward, making the PM motor design more accurate and intuitive.
For the design of large-scale permanent magnet motors or permanent magnet motors with higher temperature requirements, the electromagnetic multi-physics coupling analysis function of ANSYS will play a significant role.
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