This study is investigated by the analyses of modal and harmonic response on BH motor, VI motor and DH motor. The natural frequency of DH motor becomes lower than that of VI motor. As the maximum amplitude of displacement is shown to be 2.06×10-2mm at 1300 Hz in case of BH motor, BH motor can be thought to be the best structure in comparison with VI motor and DH motor. The deformation of 0.34806 mm happens at the critical frequency in case of BH motor. And the maximum deformation happens at the joint connected between screw axis and seat in cases of three kinds of motors. By applying the result of this study to the designs of these kinds of motors, it is thought that the damage of linked parts is prevented. As the durability can be examined and anticipated, this result can be utilized really

Abstract
 1. 서론
 2. 본론
  2.1 모터의 성능 실험
  2.2 경계조건
 3. 해석 및 결과
  3.1 Modal 해석
  3.2 Harmonic response해석
 4. 결론
 후기
 References

• 김기선(공주대학교 기계자동차공학부) | Key-Sun Kim
• 조재웅(공주대학교 기계자동차공학부) | Jae-Ung Cho Corresponding Author