重载磁悬浮轴承电控系统的研究

Electric control system of heavy-load magnetic bearing

针对大型高速旋转机械中磁悬浮轴承电磁力小和响应(电流响应和电磁力响应)速度较慢等问题,采用了IGBT器件作为功率器件,研究了变换器的拓扑结构及其控制方法,设计制作了高电压大电流功率放大器和电压可调高频开关功率电源。将设计制作的功率放大器和开关功率电源,与实验室已有的传感器和数字控制器相结合,搭建了重载磁悬浮轴承电控系统,并将其应用于磁悬浮飞轮转子试验台进行了试验。试验及研究结果表明:重载磁悬浮轴承电控系统的最大输出电流为120 A,最大输出电压为450 V,大大提高了磁悬浮轴承的电磁力和响应速度,并且其能够保证飞轮转子在工作转速范围内稳定运行。

Aiming at the problems of small electromagnetic force and slow response (current response and electromagnetic force response) of magnetic bearing in large high-speed rotating machinery, IGBT was used as the power device. The topologies of the converter and its control methods were studied. The power amplifier and voltage adjustable high frequency switching power supply were designed and fabricated. The designed power amplifier and switching power supply were combined with the existing sensors and digital controllers of the laboratory to build a heavy-duty magnetic suspension bearing electronic control system and applied to the magnetic suspension flywheel rotor test bench. The test results show that the maximum output current of the heavy magnetic suspension bearing electronic control system is 120A, and the maximum output voltage is 450V, which greatly improves the electromagnetic force and response speed of the magnetic suspension bearing, and it can ensure the stable operation of the flywheel rotor within the working speed range.