基于电流特性的主动磁轴承电磁线圈故障诊断

磁悬浮轴承因其优异的性能得到了广泛应用,但电磁线圈的故障可能导致转子失控,从而造成严重后果。提出一种应用于磁悬浮轴承的在线电磁线圈故障诊断方法,通过建立数字开关功放输出电流的数学模型,获取其电流输出特性,从理论上分析线圈发生故障对输出电流变化率的影响;建立两态调制下的Matlab/Simulink模型,进行了仿真验证,证明了方法的理论可行性;设计基于电流过采样的故障诊断方案以及相关算法,搭建基于数字信号处理器(digital signal processor, DSP)的数字开关功放试验平台,进行了相关线圈故障的在线检测试验,结果证明了本研究方法的有效性。

Fault diagnosis of electromagnetic coil in active magnetic bearing based on current characteristics

Magnetic bearings had been widely used for its excellent performance,but the fault of electromagnetic coil might cause the rotor to lose control and cause serious consequences. A on-line fault diagnosis method of electromagnetic coil formagnetic bearings was proposed through the establishment of mathematical model of digital switching power amplifier output current, the current output characteristic was obtained, and the influence of the coil fault on the output current variation rate was theoretically analyzed. A Matlab/Simulink model was established under the two state modulation,the simulation results demonstrated the theoretical feasibility of the method. A fault diagnosis scheme and related algorithm based on current oversampling was designed.Then a digital switching power amplifier test platform based on digital signal processor(DSP)was built, and the on-line detection experiment of related coil faults was carried out. The experimental results demonstrated the effectiveness of the method discussed in this paper.