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The magnetic bearing suspends the rotor by controlled magnetic force without any mechanical contact between rotor and stator.It has been noticed widely and researched in the fields of science and industry,for its advantages such as contact-free,no lubrication,no wear,low noise,high rotation speed and long-life,etc.Usually, digital control methods are used to set up the DSP-based control platform for designing the controller of magnetic bearing. Field Programmable Gate Array (FPGA) is widely used to achieve high-performance of the digital signal processor due to its high-performance parallelism, customization flexibility and feasible cost-effectiveness. In the view of feasibility and innovation, a FPGA-based PID algorithm is designed and implemented for the magnetic bearing control application.In this paper, the feature, operating principle and research status of magnetic bearing are introduced firstly. Next, the single-freedom-degree mathematical model of the magnetic bearing is derived. Then, matlab / simulink and the system generator software package are used to model and simulate the analog control and digital control systems.Based on the theoretical analysis and simulation verification of the magnetic bearing system, the hardware and software designs of some circuits including signal processing, analog-to-digital conversion, PID computation, digital-to-analog conversion, chopper and so on are completed. Experimental results show that the FPGA-based controller can achieve stability control of the suspension bearings and has a good anti-interference capability.
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