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방성환(Bang, Seong-Hwan),김지희(Kim, Ji-Hui),문태영(Mun, Tae-Yeong),조병준(Jo, Byeong-Jun),이창섭(Lee, Chang-Seop),김경용(Kim, Gyeong-Yong),권학주(Gwon, Hak-Ju) 한국화재소방학회 2013 한국화재소방학회 학술대회 논문집 Vol.2013 No.추계
본 연구의 목적은 소방공무원에서 빠른 식사속도가 위장관계통을 비롯한 신체질환과 당뇨를 비롯한 대사증후군 질환에 어떤 영향을 주는지 알고자 하는데 있다. 이 연구를 통해 식사시간이 빠르면 당뇨병 발병률이 높아지고, 먹는 양이 많아져 체중이 증가되어 비만으로 이어질 수 있다는 것을 제안한다. 각 소방학교에서 신임 및 전문교육 시 올바른 식습관을 가질 수 있도록 특별교육 등이 필요하며, 긴장상태에서 근무하는 소방공무원의 심신을 이완 시킬 수 있도록 관리부서에서 많은 관심과 대책이 필요하다. 소방공무원의 건강이 국민들의 소방서비스 질 향상에 영향을 주는 것은 분명한 사실이기 때문에 올바른 식습관을 통하여 식사시간을 늦추어 소방공무원의 건강을 지키는 것이 국민들에게 더욱더 질 높은 소방서비스를 제공 할 수 있을 것이다.
방성환(Seong-Hwan Bang),박시목(Si-Mok Park),추민기(Min-Gi Chu),송지훈(Ji-Hun Song),이동렬(Dong-Ryul Lee) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.8
The aim of this research was to investigate the torque performance of the motor in an electric vehicle depending on the rotor shape and air gap. The research focused on numerical comparison of torque performance of new rotors based on the average torque and torque ripple rate, which appeared according to the number and placement of permanent magnets. This research was numerically analyzed by MAXWELL V21.1. Average torque values in cases 1, 2, and 3 were increased, but vibration and noise in cases 1 and 3 were increased as the torque ripple rate increased. Considering the average torque and torque ripple rate, the torque performance of case 2 was the most optimal. Compared with Model N, the average torque of case 2 was increased by 9.1% and the torque ripple rate was reduced by 1.5%. The torque performance according to the size of air gap was compared with the basic model of case 2, which showed the best performance. An air gap of 0.7 mm applied to Model N showed the best torque performance. An additional magnet on case 2 and air gap of 0.7 mm provided the best torque performance and improved the driving motor performance for motor durability.
A Study on Cooling Performance of Electric Vehicle Motor for Different Cooling Channel Shapes
박시목(Si-Mok Park),방성환(Seong-Hwan Bang),추민기(Min-Gi Chu),송지훈(Ji-Hun Song),이동렬(Dong-Ryul Lee) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.6
This research investigated the cooling performance of the motor in electric vehicle depending on the shape of the cooling channel. The research, conducted numerically by FLUENT V20.1, focused on the numerical study of heat transfer coefficients to find an optimum design shape with high cooling performance. To compare the cooling performance, the temperatures in the coil and cooling channel were analyzed. As a result of forced convection, the average cooling channel velocity of Case 2 was 38% faster than Model N and 34% faster than Case 1. The maximum temperature of the cooling channel of Case 2 was 8.7% lower than Model N and 5.6% lower than Case 1. The minimum temperature of the coil of Case 2 was 2.7% lower than Model N and 4.3% lower than Case 1. The maximum temperature of the coil of Case 2 was 4.6% lower than Model N and 2.9% lower than Case 1. Ultimately, cooling channel of Case 2 showed the best cooling performance and improved driving performance for motor durability.