摘要
永磁偏置磁轴承需要磁轴承线圈流过双极性电流,因而开关功放多采用全桥结构,而全桥结构的开关功放功率管数量多,导致其功耗大和可靠性低等。本文采用新型三桥臂开关功放主电路拓扑结构,通过DSP和FPGA的数字系统实现了空间矢量PWM(SVPWM)的调制方法。实验结果表明,这种方法相对于全桥结构两电平调制方法具有低纹波电流的优点,可以大大降低磁轴承的涡流损耗,相对于全桥结构三电平的开关功放具有减少了功放管数量和减小了功放体积的优点,可以进一步降低开关损耗,同时功放管数量的减少可增加系统的可靠性。
The magnetic bearing biased by permanent magnetic body needs bipolar current, so the full-bridge structure is often used in its switching power amplifier. The conventional full-bridge power amplifier has many power-tubes in magnetic bearing system, and this will leads more power-loss and less reliability. In this paper, a 3-leg switching power amplifier circuit is adopted to realize the SVPWM modulator approach using the digital system which includes DSP and FPGA. The test results indicate that this method can reduce the eddy-current-loss remarkably due to the reduction of current ripple relative to the two-level method, and can reduce the switch-loss due to the less number of power-tubes relative to the three-level method with full-bridge power amplifier. In the same time, this method can increase the reliable of system due to the less of the power-tubes.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第5期119-124,共6页
Transactions of China Electrotechnical Society
基金
国防科工委民用航天预研(科工技[2004]1536号)资助项目
关键词
磁轴承
开关功放
SVPWM
数字实现
Magnetic bearing, power amplifier, SVPWM, digital realization
