Integrated control of a driving and driven magnetically levitated flywheel based on a TMS320C31+FPGA (field-programmable gate array) digital controller

In the light of the demands for a low power consumption, high reliable and integrated driving and driven magnetically levitated flywheel with a driven control in three degrees of freedom along the axial direction and a driving control in two degrees of freedom along the radial direction, integrated and designed was its controller. Firstly, a mathematical model was established for the driving magnetic bearing with proper control tactics being chosen. On this basis, an integrated digital control system with DSP+FPGA serving as the core, including a signal modulation, outer storage, driving and power amplification module, was presented and experimentally verified. The test results show that when the flywheel is levitated in a static state, the radial runout of the rotor is around 70 mV, about 8.7% of the protection clearance (the peak-peak value is about 8 V). When the flywheel is accelerated to its rated speed, the radial runout of the rotor is around 1.2 V, around 15% of the protection clearance. When operating at the rated speed, the power consumption of the magnetic bearing system of the magnetically levitated flywheel is only 5.5 W, thus meeting the requirements for the performance of the flywheel.