螺杆压缩机用永磁电机电磁设计及转子结构研究

发布时间：2018-01-20 01:05

本文关键词： 螺杆压缩机永磁同步电动机转子结构机械强度分析固有特性分析　出处：《沈阳工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：螺杆压缩机作为新一代压缩机，广泛应用于矿山、化工、能源等工业部门，逐渐取代了其他类型的压缩机。此外，螺杆压缩机消耗了太多的能源，是许多企业中的用电大户。因此，降低压缩机的能源消耗实现高效节能成为许多科研院所以及企业当前亟需解决的重大课题。目前，许多企业均选择变频电机替代常规电机来驱动压缩机并取得了一定成效。现在大多数的变频螺杆压缩机均由异步电动机驱动，然而异步电动机效率低、变频控制比较复杂。相比较之下，永磁同步电机具有温升低、力能指标高、良好的起动性能、轻载负荷效率高等优点，是未来螺杆压缩机的发展趋势。本文简要介绍了压缩机用电机的发展，并针对额定功率45kW，转速4000r/min的螺杆压缩机用永磁同步电动机展开研究。首先，针对螺杆压缩机用永磁同步电动机的实际运行情况，调试了8极48槽、6极36槽和4极24槽三种不同极槽配合永磁同步电机电磁设计方案。通过比较分析其性能，确定了永磁同步电动机的极数。其次，进一步对选定极数的永磁同步电动机方案的性能进行分析研究。对采用不同极槽配合、转子磁路结构、气隙长度以及定子内径参数的永磁同步电动机进行对比分析，以确定螺杆压缩机用永磁同步电动机转子内部结构的各项参数。再次，，利用ANSYS有限元软件对永磁同步电动机的转子结构进行机械强度分析，通过对转子受力情况的计算结果对比，分析影响转子结构机械强度的关键因素。根据转子结构应力分布的计算结果对其进行优选，从结构上保证电动机安全可靠。最后，利用Solidworks和ANSYS软件，建立了整体的螺杆压缩机转子动态分析模型。通过对上述模型动态特性的分析，得出螺杆转子以及系统整体的固有频率和振型。
[Abstract]:Screw compressor as a new generation of compressors, widely used in mining, chemical, energy and other industries, gradually replacing other types of compressors. In addition, screw compressors consume too much energy. Therefore, reducing the energy consumption of compressors to achieve high efficiency and energy saving has become a major issue that many scientific research institutes and enterprises urgently need to solve. Many enterprises choose frequency conversion motor instead of conventional motor to drive compressor and have achieved certain results. Now most of the variable frequency screw compressor are driven by asynchronous motor but the efficiency of asynchronous motor is low. Frequency conversion control is more complex. Compared with PMSM, PMSM has the advantages of low temperature rise, high force and energy index, good starting performance, high efficiency of light load and so on. It is the development trend of screw compressor in the future. This paper briefly introduces the development of compressor motor and aims at the rated power of 45kW. The permanent magnet synchronous motor (PMSM) for screw compressor with rotational speed of 4000r / min is studied. First of all, according to the actual operation of permanent magnet synchronous motor for screw compressor, 8 pole 48 slots are debugged. The electromagnetic design scheme of permanent magnet synchronous motor with 6 pole 36 slot and 4 pole 24 slot is introduced. The pole number of permanent magnet synchronous motor is determined by comparing and analyzing its performance. Secondly, the performance of permanent magnet synchronous motor (PMSM) with selected poles is analyzed and studied. The air gap length and stator inner diameter parameters of permanent magnet synchronous motor (PMSM) are compared and analyzed in order to determine the internal structure parameters of PMSM rotor for screw compressor. Thirdly, the rotor structure of permanent magnet synchronous motor (PMSM) is analyzed by ANSYS finite element software, and the results of calculation are compared. The key factors affecting the mechanical strength of the rotor structure are analyzed. According to the calculation results of the stress distribution of the rotor structure, the optimum selection is carried out to ensure the safety and reliability of the motor structurally. Finally, the dynamic analysis model of screw compressor rotor is established by using Solidworks and ANSYS software, and the dynamic characteristics of the model are analyzed. The natural frequencies and modes of the screw rotor and the whole system are obtained.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM351

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