Research On Optimized Design And Control Strategy Simulation Of Electromagnet For Stereo Garage

With the development of our economy, a steep rise in private car ownership has brought a serious parking problem, which has led to a rapid development of stereo garage. In our country, different kinds of stereo garages with different transverse-moving devices have emerged. The background of this research is based on the transverse-moving device of a high efficient direct-drive stereo garage. The main contents are as follows:(1) The structure of connection device attached to the different kinds of transverse-moving device was introduced, and their working mode was also analyzed. Additionally, the advantages of electromagnet used in direct-drive stereo garage was analyzed.(2) Magnetic shunt was proposed to realize a better response performance. And the formula for calculating electromagnetic force was derived based on the magnetic circuit method by assuming that the flux only transmitted in the shortest path in airgap. The static electromagnetic force performance was determined by magnetic potential μδ on gap and dGδ/dδ. The principle of how parameters, e.g. the cross section’s size of core h, the height of magnetic shunt h, the gap between core and magnetic shunt δ4, affect the electromagnetic force was analyzed according to the formula. With FEM (finite element method), the higher the magnetic shunt is, the less margin between the maximum force and the minimum force will be. And with the adjustment of δ4, the place where extreme points appeared could be adjusted. Apart from this, the saturation phenomenon of magnetic shunt will also helpful to make the force curve more flat.(3) The dynamic simulation model was built in Matlab/Simulink. The simulation results shows that the new structure with magnetic shunt performed faster than the original structure during the close process, and the force curve was flatter, with a much smaller figure when the electromagnet was closed. The closed current-loop control model for electromagnet based on a reference velocity was built and operated in Simulink. The results shows that the effective value of armature was2.1A during a transverse-moving period, which was much smaller than the value (10A) when driven by full power. It means this kind of control strategy will reduce energy consumption.