偏心故障下可偏转双定子开关磁阻电机的电磁振动特性分析

Analysis of Electromagnetic Vibration Characteristics of a Deflectable Double-stator Switched Reluctance Motor with Eccentric Fault

对一种带转子偏心故障的可偏转双定子开关磁阻电机进行振动和声学特性研究。考虑到声学振动涉及到电磁场、机械场和声场,首先建立偏心状态下的数学模型,对气隙间距、磁路磁链和磁路特征进行分析,其次利用有限元软件建立偏心故障下电机三维有限元模型。并对偏心故障状态和无偏心故障状态进行比较,得到电机有无偏心状态下的电磁分布和磁链-角度特性,将不均匀的电磁力导入谐响应模块中,对定子铁芯振动进行分析。最后,对有无偏心状态下的声场进行分析。结果表明,偏心状态下电磁径向力出现畸变,相较于无偏心状态,振动和噪声幅值增加,出现噪声分布不均匀现象。对电机转子偏心故障的研究可为电机未来的故障诊断和特性优化提供参考。

The vibration and acoustic characteristics of a deflectable double stator switched reluctance motor with eccentricity fault are studied.Considering the relation of the acoustic vibration to electromagnetic field,mechanical field and sound field,the mathematical model of the motor under eccentric condition is established.The air gap spacing,magnetic circuit flux linkage and magnetic circuit are deduced.Then,the three-dimensional finite element model of the motor is established by means of finite element software.The electromagnetic distribution and flux linkage angle characteristics of the motor with or without eccentricity are obtained and compared.Introducing the uneven electromagnetic force into the harmonic response module,the stator core vibration is analyzed.Finally,the sound field with or without eccentricity is analyzed.The results show that the electromagnetic radial force is distorted in the eccentric fault state,the amplitudes of vibration and noise increase in comparison with the non-eccentric state,and the noise distribution is uneven.The research on the eccentric fault of motor rotor provides a reference for the fault identification and optimization of motor features in the future.