低噪声屏蔽电机定子屏蔽套激振力和受迫振动分析

发布时间：2019-05-20 11:41

【摘要】：三相屏蔽电机是屏蔽电泵专属特种电机,该电机的性能优劣对系统振动噪声有很大影响。屏蔽电机气隙内的旋转磁场在定子屏蔽套中感应出涡流,除产生屏蔽套涡流损耗外,该涡流还将与气隙合成磁场相互作用形成径向和切向高频电磁激振力。考虑到定子屏蔽套是薄壁件,与定子齿冠间存在一定的安装间隙,所以在电磁激振力下定子屏蔽套将产生电磁振动和噪声。首先从解析的角度推导得到了径向和切向电磁激振力的数学表达式,进而采用有限元法计算定子屏蔽套典型位置点磁通密度时间谐波和圆周方向上磁通密度空间谐波分布规律及谐波含量,得到了不同屏蔽套材质时的涡流电流密度分布。计算了定子屏蔽套采用哈氏合金时的电磁激振力变化曲线,并与解析计算结果进行了横向对比,验证了解析计算的正确性。最后,计算分析定子屏蔽套的工作模态和在电磁激振力作用下的机械形变,为后续屏蔽电机的减振降噪提供理论依据。
[Abstract]:Three-phase shielded motor is the exclusive special motor of shielded electric pump. The performance of the motor has a great influence on the vibration and noise of the system. The rotating magnetic field in the air gap of the shielded motor can induce the vortex in the stator shield sleeve. In addition to the Eddy current loss of the shield sleeve, the vortex will also interact with the air gap synthetic magnetic field to form radial and tangential high frequency electromagnetic excitation forces. Considering that the stator shield is a thin-wall part and there is a certain installation gap between the stator shield and the stator crown, the stator shield will produce electromagnetic vibration and noise under the electromagnetic excitation force. Firstly, the mathematical expressions of radial and tangential electromagnetic excitation forces are derived from the analytical point of view. Then the finite element method is used to calculate the time harmonics of the magnetic flux density at the typical position point of the stator shield sleeve and the spatial harmonic distribution of the magnetic flux density in the circumferential direction, and the Eddy current density distribution of different shielding sleeve materials is obtained. The variation curve of electromagnetic excitation force of stator shield sleeve with Hart alloy is calculated and compared with the analytical results to verify the correctness of the analytical calculation. Finally, the working mode of the stator shield sleeve and the mechanical deformation under the action of electromagnetic excitation force are calculated and analyzed, which provides a theoretical basis for the subsequent vibration reduction and noise reduction of the shielded motor.
【作者单位】：哈尔滨工程大学;
【基金】：哈尔滨市(科技创新型人才)项目(2014RFQXJ098) 哈尔滨市应用技术研究和开发项目(2015RAXXJ002)资助
【分类号】：TM35

【相似文献】