Research methods and key issues of speed-regulating asynchronous magnetic couplers
4 min readThe basic operating principle of the speed-regulating asynchronous magnetic coupler is the principle of electromagnetic induction, which belongs to the category of electromagnetism, and at the same time involves materials science, mechanical transmission and other disciplines, so the research on the speed-regulating asynchronous magnetic coupler is an interdisciplinary research topic. The key step in the study of this topic is to obtain the interaction relationship of the electromagnetic field in the magnetic coupler, the current mainstream research methods include the finite element simulation method and the analytical calculation method, for the finite element simulation method, there are mainly two-dimensional finite element simulation method and three-dimensional finite element simulation method, the former model is small, the operation time is short, but the accuracy is low, which is suitable for the study of the simple distribution law of the electromagnetic field in the primary stage of the research, such as the flow direction of the magnetic inductance line in the magnetic coupler. The latter has a large modeling volume and a long operation time, but high accuracy, and is suitable for studying the electromagnetic torque of the magnetic coupler, the magnetic flux density of the air gap, and other occasions that require high calculation accuracy. For analytical calculation methods, there are mainly equivalent magnetic circuit method, vector magnetic potential method, equivalent circuit method, etc.
The speed-regulating asynchronous magnetic coupler not only has the ability of ordinary magnetic coupler to transmit torque, but also can adjust the output speed by changing the meshing length of the inner and outer rotor. When the speed-regulating asynchronous magnetic coupler is used in fans and pumps, reducing the speed of fans and pumps by adjusting their output speed can effectively reduce energy loss and achieve energy saving, which plays an extremely important role in industrial applications. Therefore, for the speed-regulating asynchronous magnetic coupler, the relationship between the meshing length of the inner and outer rotors and the output speed, that is, the relationship between the speed regulation, is the key problem in the research. When it is necessary to adjust the output speed of the magnetic coupler so that the fan and pump device can achieve speed reduction, the meshing length that the magnetic coupler needs to adjust can be quickly obtained by using the speed regulation relationship, which greatly improves the efficiency of speed regulation. From the perspective of the research status at home and abroad, the research on the speed-regulating asynchronous magnetic coupler is mostly for the finite element simulation and calculation of magnetic flux density, torque and current density, and the research on the speed regulation relationship is less involved, and from the above analysis, it can be seen that the speed regulation relationship is very important in practical engineering applications, so this paper innovatively proposes the research on the key problem of the speed regulation relationship of the speed-regulating asynchronous magnetic coupler.
The main research content of this project
As a new type of transmission device, the speed-regulating cartridge asynchronous magnetic coupler can change the output speed by adjusting the meshing length between the inner and outer rotors, so as to meet the actual production needs. In this paper, the torque formula, transmission efficiency formula, transmission performance, speed regulation relationship and speed regulation performance of magnetic coupling are studied, and the main research contents are as follows:
（1）Analysis and calculation of electromagnetic torque and transmission efficiency of speed-regulating cartridge asynchronous magnetic coupler. The magnetic circuit model of the speed-regulating asynchronous magnetic coupler is used to analyze, and the equivalent magnetic circuit method is used to analyze and calculate the main magnetic resistance, leakage resistance and magnetokinetic potential in the magnetic circuit model of the magnetic coupler. The magnetic induction intensity of the air gap in the magnetic circuit of the magnetic coupler is obtained by Kirchhoff's law of current and voltage, and the final electromagnetic torque formula of the magnetic coupler is obtained by combining the torque calculation formula and the three-dimensional correction coefficient. The output power expression and input power expression of the speed-regulating asynchronous magnetic coupler are obtained by using the power formula, so as to obtain the transmission efficiency during its operation.
（2）Analysis of the transmission performance of the speed-regulating cartridge asynchronous magnetic coupler. The three-dimensional finite element software was used to simulate and analyze the main factors affecting the transmission performance of the speed-regulating cartridge asynchronous magnetic coupler, including magnetic induction intensity, current density, electromagnetic torque and transmission efficiency.
（3）Derivation of the speed regulation relationship of the speed regulating cartridge asynchronous magnetic coupler and the analysis of the speed regulation performance. The relationship between the speed regulation of the magnetic coupler under constant torque load and variable torque load is obtained by using the torque calculation formula and the three-dimensional correction coefficient formula during speed regulation. The finite element software is used to simulate and analyze the speed regulation performance under the two load conditions, including the simulation verification of the speed regulation relationship, the energy saving analysis, the analysis of the change law of the magnetic field in the process of speed regulation, and the analysis of the change law of current density in the process of speed regulation.
（4）Experimental verification of the speed regulation relationship of the drum-type speed-regulating asynchronous magnetic coupler. The experimental platform is used to experimentally verify the relationship between the meshing length and the output speed, speed difference, and slip rate under different input speeds and different loads when the magnetic coupler drives a constant torque load; the experimental platform is also used to experimentally verify the speed regulation relationship when the magnetic coupler drives a fan load.
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