磁轴承电感传感器无功补偿技术  

Reactive power compensation technology for the inductive sensors of magnetic bearings

作　　者：王纯一 张剀[1] 徐旸[1] WANG Chunyi;ZHANG Kai;XU Yang(Department of Engineering Physics,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《储能科学与技术》2021年第5期1650-1655,共6页Energy Storage Science and Technology

基　　金：国家重点研发计划项目(2018YFB0905500);国家自然科学基金项目(51775292)。

摘　　要：电感位移传感器由于其灵敏度高、线性度好、成本低等特点而被广泛应用于磁轴承转子位置的测量。电感传感器的灵敏度通常与功率正相关。为获得较高的灵敏度,需要提升功率,尤其对于恒磁通轴向电感位移传感器应用,这对功率运放提出了很高的要求。提出了一种用于电感传感器的无功补偿技术,可在不影响传感器灵敏度的前提下,在传感器的使用频率范围内(20~40 kHz),将功率放大器的输出视在功率降低70%以上,降低了对功率放大器的最大输出功率要求。评估了补偿电容精度对补偿效果的影响,证明了无功补偿对补偿电容容值精度要求不高,具有工程实用价值。Inductive displacement sensors are widely used to measure magnetic bearing rotor position because of their high sensitivity,good linearity,and low cost.The sensitivity of inductive sensors is typically positively correlated with power consumption.Power improvement is necessary to obtain high sensitivity,particularly for applying the constant flux axial inductive displacement sensor,which requires high power amplifiers.Accordingly,finding a way to reduce the total power of the sensor without changing its sensitivity will help reduce hardware costs.In this paper,a reactive power compensation technology for the inductive sensors of magnetic bearings is proposed.By paralleling appropriate capacitors at both ends of the excitation coils of the sensor,the study was able to realize a parallel resonance state,thereby greatly reducing the reactive power of the entire circuit.The experimental results showed that,without affecting the sensors'sensitivity,the power amplifier's apparent output power could be reduced by more than 70%at 20~40 kHz.This reduced the maximum output power requirement of the power amplifiers.Following that,the influence of compensation point selection on the compensation effect was tested.The results showed that the compensation point selection demand was very low.Finally,the influence of compensation capacitance precision on the compensation effect was evaluated.The results indicated that reactive compensation did not require high compensation capacitance precision,and the 10%precision capacitor could achieve a satisfactory power optimization effect.Parallel reactive power compensation could significantly reduce the total apparent power of the sensors and the cost of power amplifiers.This technology presents practical value in the field of engineering.

关 键 词：电磁轴承 电感传感器 无功补偿 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]