Discussion about the semi-active control for the electro-magnetism suspension and simulating to verify

The principle of the electro-magnetism suspension with semi-active control mode was introduced and three semi-active control schemes were presented. Basing on comparing three methods, the optimal semi-active control scheme, which included a rectifier with no control and a PWM chopper in the bus for adjusting the power of the load, was get and was simulated in MATLAB to verify. The result indicated that load current, load voltage and the output power absorbed by the electro-magnetism suspension was going up with the increasing of the semi-control switch´s circle ratio. It testified that optimum one could be realized the semi -active control aim to control damper power absorbed by the semi-active electro-magnetism suspension fully and consequently verified the feasibility of the control method proposed in the paper.