| Permanent magnet governor is a new magnetic transmission speed control device,the prime mover side and the load side of the non-contact connection,not only to meet the maximum during start-up and braking system inertia,but also with a tune Speed,flexible start,adapt to extreme environments,reduce vibration and electromagnetic interference-free features.At present,the research on magnetic speed control equipment mainly focuses on the calculation of magnetic field and energy consumption.The research on temperature field and its cooling technology is still not perfect.This paper mainly studies the temperature field distribution of permanent magnet governor and,the specific process is as follows:First of all,this paper describes the working principle and mechanical structure of permanent magnet governor.Based on this principle,taking a 500kW permanent magnet governor as an example,the three-dimensional electromagnetic field simulation analysis is carried out.After performing the dynamic and static performance After analysis,we can get the entire electromagnetic speed governor and its components of the electromagnetic field,eddy current distribution,and the size of a stable torque output,eddy current loss size.Then,the structural parameters were adjusted,and the torque output,axial force and eddy current loss under different slip,air gap were analyzed.The MATLAB data visualization of the trend was carried out.Secondly,using ANSYS finite element simulation software to calculate the temperature of permanent magnet governor in the rated power work,the temperature distribution of each structure.Simulation results show that demagnetization does not occur even when the temperature of the permanent magnet material is less than the temperature at which it works safely even on the hottest copper plate.After that,the influences of different structural parameters on the temperature were studied,and the influence of the slip and the number of permanent magnets on the temperature were tested.And the stress field was introduced to analyze whether the deformation of the copper plate under the thermal stress meets the standard of stress,that is,less than the length of the air gap.The result shows that the change of stress meets the standard,and the prototype can run reliably for a long time.Thirdly,the cooling fins added to the permanent magnet governor,run the simulation found that the heat sink cooling effect is significant.Then,the influences of different fin structures on the heat dissipation performance are studied respectively.An optimized fin design is obtained considering the manufacturing cost,structural stability and heat dissipation performance.Finally,due to the limited heat dissipation capacity of the natural cooling device,the forced air cooling device was introduced and the finite element simulation software ANSYS FLUENT was used to calculate the influence of the cooling air velocity on the heat dissipation performance.The heat dissipation coefficient was verified and discussed The relationship between oxygen content and heat dissipation at different altitudes was analyzed.The trend of thermal performance of permanent magnet governor under forced air cooling condition was analyzed. |
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