磁悬浮轴承, 数字控制器, 容错技术, DSP

The reliability of AMB digital controller was studied herein. According to the characteristics and structure of AMB digital controller, it was divided into three parts, named DSP chip, signal input channels and signal output channels respectively. The possible fault type of each part was analyzed. Aiming at each fault type, this paper developed a high-reliability AMB digital controller in which the TI’s floating-point DSP chip TMS320VC33 severed as the core. Experiments that used to verify reliability of controller on the five degrees of freedom magnetic bearing system were done. In the experiments, when rotor is at the speed of 30 000r/min, the controller can diagnose the faults and switches to the reserve DSP in 100μs which is quick enough to guarantee the stabilization of the whole system after the main DSP chip is manually reset. Similarly, the rotor states stay the same after any of those input-output channels are cut off at the same high speed, the controller can quickly determine the failed channels and switch to the backup channels in 20μs.