| Magnetic gear is a non-contacted transmission device,which is through magnetic coupling. It has many advantages of magnetic transmission, such as no lubrication, no noise, automatic overload protection, etc. It can also effectively reduce the size and weight of the device, and improve the stability of the structure. Again,the introduction of the pole piece can greatly improve the torque density and efficiency of magnetic gear.This makes the magnetic gear more widely used and the value more higher applicated. Many aspects about the magnetic gear are analyzed:(1) The structure characteristics of the magnetic gear is introduced, expounds the operation principle of the magnetic gear and the magnetic field modulation principle of pole piece through analytical method, Introduces three kinds of operation mode of the magnetic gear, and its transmission ratio formula was calculated, and its torque characteristics of internal and external rotor and the pole piece were analyzed. In addition, permanent magnet model of tile shape is used to the magnetic gears, and the Matlab software is used to calculate the permanent magnet along the radial, tangential and axial direction.(2) The finite element simulation Maxwell 2D was used for magnetic field principle of magnetic gear modulation. Internal and external air gap magnetic field were analyzed when inner and outer rotor excitated respectively, whether the pole piece introduced in or not. The magnetic field of air gap is directly related to the transmission performance in magnetic gear. Therefore, The air-gap of magnetic field and the air-gap of modulated magnetic field is analyzed by Ansoft 3D, the model is established and the air-gap of permanent magnet rotor and the air-gap of modulated rotor are simulated.Finally, the 2D and 3D finite element of magnetic gear with the same parameter model is analyzed to illustrate the effects of end effect on magnetic gear transmission performance, and its influence is also analyzed.(3) Base on the three movements of magnetic gear, and the relationship between torque calculation under double rotors, use Maxwell 2D to analysis the three kinds of motion, and study the effect of load on the magnetic gear transmission performance. The relationship between the two-rotor speed of three kinds of motion is analyzed, and under the condition not considering loss is explored, and the torque changes as the load increases.Considering the loss of magnetic gears, using Maxwell 2D to analysis the influence of the rotational speed and torque load under the consideration of pole piece is fixed with the magnetic gear steady running, and loss is analyzed to explore the effect of the change with the load and the efficiency.(4) In order to validate the correctness of the theory and simulation analysis of magnetic gear with the air gap of magnetic field and double rotor rotation performance, a magnetic gear prototype with internal and external rotor of 7:15 is developed.Three dimensional static air-gap magnetic field measurement experiment platform is set up. Radial, tangential and axial component of three dimensional space distribution and the modulation of air-gap magnetic field of the radial, tangential and axial three-dimensional map is analyzed by it; In addition, Use high performance magnetic gear transmission performance of double rotor rotates performance experiment equipment was carried on the prototype to study the transmission performance, and analysis of the pole piece fixed when magnetic gear under non-loaded loss, and transmission performance under different rotational speed and load, and analysis its effect on the transmission efficiency. |
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