Single Degree Of Freedom Magnetic Levitation System Design And Control Research

Magnetic Levitation is a relatively new Technology in Mechanic and electronics, it has lots of merits, such as no mechanical contact, no need of lubrication, no wear, less noise and can improve the service time of the equipments etc. It has been paid more attention to drive a levitated work stable though linear motor. It's characters highly depend on the sensor and the method of control. It is difficult for the magnetic levitation system to get the high precision, high frequency, and steady sensor and compensate the variety of the parameters and the uncertainties from outside. The traditional ones cannot reach the needs of the system. It has great significance to study and analyze the sensor and control methods in magnetic levitation system.In this paper, to overcome the difficulties Photo-electric Sensor and single freedom degree device were studied and designed. And then the mathematical models based on current and voltage of the magnetic levitation system was build. More studies are discussed base on the mathematical models; the important thing is to find an easy and advanced control method. Base on the traditional control method(PID) and the advanced control method(H_∞ Theory), designed two kinds of compensator. And then compare the performance of these two controllers through computer simulation. The results show: The magnetic levitation system will be more stable and robust base on the H_∞ control theory. The system can be stable situation in short time.In system experiment, design the numerical compensator based on the DSP chip (TMS320LF2407). And prove the control method through more experiments. Results show: Compensator based on H_∞ theory is suitable for the system, can levitate the steel ball steadily and is more robust.