Abstract

Magnetic suspension system is a typical non-linear hysteretic system. A kind of technology, which combines the permanent magnet and the electromagnetism, is presented for its characteristics and can obviously reduce power consumption. In order to solve the impact of the change of current in magnet coils on the overall rigidity, a double closed loop control system, which introduces the current loop into the position loop for forming a position and current double closed loop control system, is adopted. A fuzzy PID controller is designed to meet the requirement of suspended beams on the machine tool according to the process characteristics of the machine tool. Compared with the results of the simulation, it can be shown that fuzzy PID controller improves the stiffness of the suspension system which can meet the precision requirement of the magnetic suspension beams system on the machine tool.

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