Analysis of System Architecture of FPGA-based Embedded Controller for Magnetically Suspended Rotor

This paper discusses a design and implementation of an application specific architecture of active magnetic bearings (AMBs) controller in a field programmable gate array (FPGA) circuit. As a first step, a prototyping platform that eases development of control, testing and integration of tested algorithms into the FPGA is built. The FPGA implementation of an AMB current controller of a set of ten H-bridge switching amplifiers is presented. Different architectures of the controller are examined with respect to required performance (response time to measured and control signals, utilization of resources) and design constraints (number of ADC channels, sampling time, applied position control). The implementation of selected architecture is presented with details. The process of designing digital control application in FPGA is revealed. The opportunities and threads of flexible HDL-implementation are discussed.