Multi-field Coupling Simulation Analysis And Volume Optimize Of Electromagnetic Exciter

Vibration exciter is one of the most common machines used in construction engineering. Hydraulic vibration exciter and vibration pneumatic exciter are customary vibration exciters. As the clean energy, electromagnet has been paid much attention. With the development of electromagnetic theory and the innovation of new material technology, kinds of new magnetic machines spring up, including the electromagnet exciter. Compared with the traditional vibration exciter, electromagnet exciter is more controllable, energy-saving, high efficiency, long endure, stable and reliable and so on.The working process of electromagnetic exciter is nonlinear and complex, magnetic field, structural field and temperature field are coupled. The accurate solution to the multi-field coupling electromagnetic exciter is the key to the problem. Because an accurate simulation computing results confirm the reasonable designed structure and help designers to revise the structure, which efficiently decrease the practical test times and design cost and increase the design efficiency. Our study focused on the research presented as following:First, the fundamental theories of electromagnetic field calculation and finite element were concluded and the common analysis method and procedures for some important parameters of electromagnetic field were obtained, the mathematical model of magnetic-structural coupling electromagnetic exciter was as well established. Then, some logical simplifications were put forwarded and electromagnetic exciter coupling finite model was established and simulated and analyzed. Magnetic line distribution, magnetic density vector figures and node magnetic density nephogram were obtained. And the relationship curves of spool stress and air gap, energy and air gap, coiling inductance and air gap were finally got. In order to examine the feasibility and accuracy of our coupling simulation model, the experiments were designed to test the acceleration of spool under the laboratory condition, and acceleration curve was surveyed and drew. Then the experiment date were compared with simulation and found that a permissible error was presented, indicating our magnetic field and structural field multi-field coupling finite model of electromagnetic exciter is reliable and accurate used in the real project.Based the results discussed above, the model machine's refine design of electromagnet was carried out. The height and width of the coiling were treated as variables, the computing head face suction was extracted as state variables and electromagnet volume was as objective function. The electromagnetic structure not only meets the design requirement but also accords with the principle of minimum volume after the refine design.