不同槽参数对异步电机电磁振动的影响

发布时间：2018-05-05 17:08

本文选题：异步电机 + 电磁力　；参考：《沈阳工业大学》2017年硕士论文

【摘要】：异步电机在变频器供电下,增加的谐波含量会加剧电机振动进而增大振动噪声,然而变频器供电却广泛应用于工业中。因此需要采取适当的措施来降低异步电机的电磁振动与噪声。异步电机采用不同槽配合以及转子斜槽时,在气隙内产生抑制谐波的磁场,降低异步电机电磁力的谐波含量,对异步电机电磁振动产生抑制作用。因此,本文主要研究不同槽参数下异步电机的电磁振动,主要分为以下3个方面:首先,采用解析计算方法计算不同转子斜槽情况下的异步电机电磁力,推导出采用转子斜槽时径向电磁力解析计算表达式。利用Ansoft软件搭建有限元仿真模型,计算分析了不同槽配合异步电机的电磁力,对不同槽配合下异步电机电磁力的频谱进行比较,得出不同槽配合对异步电机电磁力的影响。其次,对异步电机进行模态计算,由于电机定子的径向变形是引起电机振动的主要原因,因此在不考虑电机轴向振动(即轴向阶次为0)的前提下进行电机模态分析。以模态分析理论为基础,仿真计算出异步电机的振型及固有频率,为下一步异步电机电磁振动的仿真分析奠定了基础。最后,利用ANSYS软件计算分析不同槽配合下异步电机电磁振动。把在瞬态磁场中计算得到的电磁力加载在异步电机定子齿部表面,仿真得到不同槽配合下异步电机的振动位移和振动加速度。通过分析结构振动仿真结果,得出不同槽配合对异步电机振动的影响,并且对三相异步电机进行了振动测试实验,以验证仿真结果的正确性。
[Abstract]:The increase of harmonic content in induction motor will aggravate the vibration of the motor and increase the vibration noise. However, the inverter power supply is widely used in industry. Therefore, appropriate measures should be taken to reduce the electromagnetic vibration and noise of asynchronous motor. When the induction motor adopts different slot matching and rotor slant slot, it produces the magnetic field in the air gap to suppress the harmonic, reduces the harmonic content of the electromagnetic force of the asynchronous motor, and inhibits the electromagnetic vibration of the asynchronous motor. Therefore, this paper mainly studies the electromagnetic vibration of asynchronous motor with different slot parameters, which is divided into the following three aspects: firstly, the electromagnetic force of asynchronous motor with different rotor slant slot is calculated by analytic calculation method. The analytical expression of radial electromagnetic force with rotor slot is derived. The finite element simulation model is set up by using Ansoft software. The electromagnetic force of asynchronous motor with different slots is calculated and analyzed. The frequency spectrum of electromagnetic force of asynchronous motor with different slot matching is compared, and the influence of different slot matching on the electromagnetic force of asynchronous motor is obtained. Secondly, modal analysis of induction motor is carried out, because the radial deformation of stator is the main cause of motor vibration, so the motor modal analysis is carried out without considering the axial vibration of motor (that is, axial order is 0). Based on the theory of modal analysis, the vibration mode and natural frequency of asynchronous motor are simulated and calculated, which lays a foundation for the simulation analysis of electromagnetic vibration of asynchronous motor in the next step. Finally, the electromagnetic vibration of asynchronous motor with different slots is calculated and analyzed by ANSYS software. The electromagnetic force calculated in the transient magnetic field is loaded on the stator tooth surface of the asynchronous motor, and the vibration displacement and acceleration of the asynchronous motor under different slot coordination are obtained by simulation. By analyzing the results of structural vibration simulation, the effect of different slot coordination on the vibration of induction motor is obtained, and the vibration test experiment of three-phase asynchronous motor is carried out to verify the correctness of the simulation results.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM343

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