The design and simulation for the meter-level gap electromagnet permanent magnet fixed-point levitation control system

Meter-level gap electromagnet permanent magnet levitation system has nonlinearity and large time-delay two major characteristics, the stability control of which can not be achieved with the traditional PID control strategy. This paper analyzes system performance with linearization dispose based balancing point of system model. In meter-level gap electromagnet permanent-magnet levitation system, motion range of the controlled object is so large that nonlinearity of electromagnetic force and the large time-delay of magnetic field establishment are more obvious. In order to achieve the rapidity and stability of the system and rapidity of the response of the system, prediction-expert PID controller was designed, which introduced in expert control and Smith forecast compensation control based on conventional PID control. The results of simulation show that the control strategy achieves the fixed-point levitation control of the electromagnetic-permanent magnet levitation system, fast response and steady-state error within two percent.