Browse > Article

A Study on Reliability Compliance Test based on Thermal Fatigue Accelerated Test for CVVL BLDC Motor  

Lee, San-Hoon (Reliability Research Corps, Korea Automotive Technology Institute)
Park, Sang-Wook (Reliability Research Corps, Korea Automotive Technology Institute)
Kim, Min-Geiun (Material Convergence Research Center, Korea Automotive Technology Institute)
Seon, Han-Geol (Motor Research Institute, KOH-A JUNG GONG Company)
Hong, Sung Ryeul (Motor Research Institute, KOH-A JUNG GONG Company)
Han, Man-Seung (Motor Research Institute, KOH-A JUNG GONG Company)
Publication Information
Journal of Applied Reliability / v.15, no.4, 2015 , pp. 241-247 More about this Journal
Abstract
Purpose : The demand for higher fuel economy vehicles has helped develop fuel-efficient vehicles such as a CVVL called continuous variable valve lift. Existing CVVL has been applying DC type motor to control intake valve, but recently some car parts manufacturers have been developing a BLDC type CVVL motor for improvements of endurance performance. The purpose of this study is to find the potential failure mechanism of the CVVL BLDC moto in early stage of development based on the design properties and design the accelerated life test model. Methods : CVVL BLDC is consist of brushs, coil, magnetic, PCB, bearing and so on. Each component has a latent failure mechanism caused by temperature, humidity, vibration. By analysis result of the failure mechanism, thermal fatigue is the most important factor of a durability of CVVL BLDC motor. So, we designed a new accelerated life test model for guarantee of the CVVL BLDC motor. Results : A crack occurred on via hole in test using the conditions we designed, so we did change the design to avoid this failure. The via hole dimension is changed a little larger, as a result we achieve improvements in reliability of the CVVL BLDC motor. By applying various kinds and extreme level of stresses, we can find the operating limits of products. Conclusion : In thesis, We analyzed the failure mechanism of CVVL BLDC and designed an accelerated life test method to give a guarantee for reliability. Based on the test results, we could improve the reliability of developments by change of design.
Keywords
CVVL; BLDC Motor; Reliability Test; Failure Analysis;
Citations & Related Records
연도 인용수 순위
  • Reference
1 조정민․박정임 외 3명 (2015), 선진사 제품과 비교평가를 통한 국산 연속가변밸브리프트 제어용 액추에이터의 내구기능적 특성 고찰, 대한기계학회 신뢰성부문 학술대회, p. 77.
2 하경표․김우태 외 7명 (2008), 연속 가변 밸브 리프트 엔진 개발, 한국자동차공학회 학술대회, pp. 70-75.
3 General Specification for Electrical/Electronic Component, GMW3172, 2008.
4 Johnson, R. W., Evans, J. L., Jacobsen, P., and Thompson, J.R (2004), The Changing Automotive Environment: High temperature Electronics, IEEE Transactions on Electronics Packaging Manufacturing, pp. 164-176.