中国电机工程学报2016，Vol.36Issue(21)：5939-5946,8.DOI:10.13334/j.0258-8013.pcsee.152443
自传感电磁轴承位移解调过程的精确建模和分析
The Precise Modeling and Analysis of Demodulation Approach in Self-sensing Active Magnetic Bearings
摘要
Abstract
The key point of realizing self-sensing active magnetic bearing is to extract rotor displacement information from coil current signal accurately. Affected by the variation of switching power amplifier’s pulse width modulation (PWM) duty cycle and rotor position, the coil current has complex and time-varying frequency spectrum. Former analysis and compensation methods of the switching harmonics demodulation type self-sensing active magnetic bearings are mainly based on a completely ideal rotor displacement demodulator model, so that it is difficult to precisely analyze the real demodulator’s output property. By utilizing the cosine Fourier series of the absolute value function and Jacobi-Anger identity, we established the frequency domain analytical model of each part of the self-sensing demodulator under static and dynamic coil current. Then the model is validated by experiment on a 4-DOF radial active magnetic bearing rigid rotor system platform. It is shown that the output of the demodulator under static coil current is the constant value which is proportional to air gap of active magnetic bearing. While the demodulator’s output under dynamic coil current includes three components, whose amplitude and distribution in frequency domain depend on the rotor position and the PWM duty cycle’s change of power amplifier.关键词
自传感电磁轴承/位移解调器/Jacobi-Anger恒等式/解析模型/动态线圈电流Key words
self-sensing active magnetic bearing/displacement demodulator/Jacobi-Anger identity/analytical model/dynamic coil current分类
信息技术与安全科学引用本文复制引用
于洁,祝长生,余忠磊..自传感电磁轴承位移解调过程的精确建模和分析[J].中国电机工程学报,2016,36(21):5939-5946,8.基金项目
国家自然科学基金项目(51477155，11172261)；浙江省自然科学基金项目(LZ13E070001)；先进航空发动机协同创新中心项目。National Natural Science Foundation of China (51477155,11172261) （51477155，11172261）
Natural Science Foundation Project of Zhejiang Province (LZ13E070001) （LZ13E070001）
Project of Collaborative Innovation Center of Advanced Aero-engine （）
