슬롯 오픈이 전동기 소음에 미치는 영향 고찰

Abstract

본 논문은 전동기의 슬롯 오픈 형상이 소음에 미치는 영향에 관한 논문으로서 슬롯 부의 공기 형상이 헬름홀츠 공명기와 유사한 형상을 가짐에 따라 전동기의 슬롯 오픈 형상의 공명기로서의 역할 유무를 확인하고자 한다. 헬름홀츠 공명기의 특성을 이용하여 소음 저감을 위한 연구의 역사는 깊다. 특히 비교적 작은 부피로 저주파 소음을 효과적으로 저감 할 수 있는 특성과 공진주파수를 구하는 공식의 단순함으로 인하여 산업계에서 널리 사용되고 있다. 앞선 연구에서는 전동기의 소음 및 진동 저감 고려의 고정자의 공명기 배열을 통한 저주파 소음 저감을 확인하는 연구가 진행되었으나, 슬롯 개폐 유무의 영향에 대해서는 고려하지 않았다. 본 논문에서는 고정자 슬롯의 개폐 유무에 따른 소음의 영향을 수학적 방법, 해석적 방법을 통하여 공진주파수를 산정하여 그 영향을 확인하였다. 또한 슬롯 차폐 시의 전자기적인 영향을 고려하고자 전동기 고정자의 형상 변형 설계를 통한 전자기 해석을 수행하여 연구 방법에 대한 신뢰성을 검증하였다. 이를 통하여 전동기 고정자 슬롯 부의 형상 변형 설계를 통한 각 모델에 대하여 실험적 검증을 수행하여 슬롯 개폐 유무에 따른 소음의 영향을 확인하였고, 공명기로서의 역할을 확인하였다.

|This thesis is about an effect of slot open shape in electric motor on noise. The purpose of this thesis is to verify whether slot open shape in electric motor whose air shape in slot part is similar to Helmholtz resonator can serve as slot open shaped resonator. Research that has covered reduction of noise by using characteristics of Helmholtz resonator has long history. Helmholtz resonator has been widely used in industries because it can reduce low frequency noise effectively with relatively small volume and it is easy and simple to find resonance frequency. Precedent studies attempted to validate reduction of low frequency noise by arranging resonator of stator that considered noise of electric motor and reduction of vibration but they did not consider an effect of opening and closing of slot has. This thesis calculated resonance frequency by analyzing an effect of noise depending on whether stator slot opens or closes slot to verify the effect through mathematical and analytical methods. In addition, this thesis verified reliability of research method by experimental analysis of electromagnetism based on electric stator shape change design to consider electromagnetic effect when slot is covered. This thesis verified an effect of noise depending on whether slot opens or closes by conducting experimental verification of each model through electric motor stator slot part shape change design to validate whether it can serve as resonator.; This thesis is about an effect of slot open shape in electric motor on noise. The purpose of this thesis is to verify whether slot open shape in electric motor whose air shape in slot part is similar to Helmholtz resonator can serve as slot open shaped resonator. Research that has covered reduction of noise by using characteristics of Helmholtz resonator has long history. Helmholtz resonator has been widely used in industries because it can reduce low frequency noise effectively with relatively small volume and it is easy and simple to find resonance frequency. Precedent studies attempted to validate reduction of low frequency noise by arranging resonator of stator that considered noise of electric motor and reduction of vibration but they did not consider an effect of opening and closing of slot has. This thesis calculated resonance frequency by analyzing an effect of noise depending on whether stator slot opens or closes slot to verify the effect through mathematical and analytical methods. In addition, this thesis verified reliability of research method by experimental analysis of electromagnetism based on electric stator shape change design to consider electromagnetic effect when slot is covered. This thesis verified an effect of noise depending on whether slot opens or closes by conducting experimental verification of each model through electric motor stator slot part shape change design to validate whether it can serve as resonator.