Shaft Trajectory Analysis in a Partially Demagnetized Permanent-Magnet Synchronous Motor
Shaft Trajectory Analysis in a Partially Demagnetized Permanent-Magnet Synchronous Motor
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DOI：
10.1109/tie.2012.2213565
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发表时间：
2013-08
影响因子：
7.7
通讯作者：
J. Urresty;R. Atashkhooei;Jordi-Roger Riba Ruiz;L. Romeral;S. Royo
中科院分区：
文献类型：
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作者：
J. Urresty;R. Atashkhooei;Jordi-Roger Riba Ruiz;L. Romeral;S. Royo
退磁故障对永磁同步电机的性能有负面影响，从而降低其效率，产生转矩脉动，机械振动和噪声等。本文对退磁故障引起的轴轨迹位移进行了研究。结果表明，这类故障会使转子位移幅值显著增大。采用非接触式自混合干涉传感器对轴轨迹进行直接测量。此外，通过有限元模拟和实验分析，分析了轴位移引起的反电动势和定子电流谱中的新谐波。由于传统的电磁有限元模型无法预测轴轨迹位移引起的谐波，提出了一种考虑实测轨迹的改进有限元模型。结果表明，与传统模型相比，改进后的模型可以得到更精确的反电动势和定子电流谱。本文对退磁故障产生的影响进行了全面的分析，这可能有助于制定改进的故障诊断方案。
Demagnetization faults have a negative impact on the behavior of permanent-magnet synchronous machines, thus reducing their efficiency, generating torque ripple, mechanical vibrations, and acoustic noise, among others. In this paper, the displacement of the shaft trajectory induced by demagnetization faults is studied. It is proved that such faults may increase considerably the amplitude of the rotor displacement. The direct measure of the shaft trajectory is performed by means of a noncontact self-mixing interferometric sensor. In addition, the new harmonics in the back electromotive force (EMF) and the stator current spectrum arising from the shaft displacement are analyzed by means of finite-element method (FEM) simulations and experimental tests. Since conventional finite-element electromagnetic models are unable to predict the harmonics arising from the shaft trajectory displacement, an improved finite-element model which takes into account the measured trajectory has been developed. It is shown that this improved model allows obtaining more accurate back EMF and stator current spectra than those obtained by means of conventional models. This work presents a comprehensive analysis of the effects generated by demagnetization faults, which may be useful to develop improved fault diagnosis schemes.