• Title, Summary, Keyword: 엔드캡

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Convective heat transfer on the rotor fan and endring of the TEFC induction motor with telemetry system (무선계측기를 이용한 회전자팬 및 엔드링에서의 대류 열전달)

  • Yun, Myeong-Geun;Ha, Gyeong-Pyo;Go, Sang-Geun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.22 no.4
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    • pp.510-519
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    • 1998
  • Recently, computer modelling is increasingly used as a design tool, which requires more detailed data for heat transfer coefficients in various regions of the induction motor. But there are little information about those of rotor fan and endring because of difficulty in measuring signals in rotating bodies. In the present studies, the temperature signals were precisely measured with self-developed telemetry system, which had multi-channels and high rotational speed. After some losses were compensated, the heat transfer coefficients of the rotor endring and fan surfaces were measured. Minimum heat transfer region was existed with endcap plate distance and maximum heat transfer was found at some rotor fan width. It was also studied that how the guide plate and endcap inside rib effected on the rotor heat transfer. The higher heat transfer were obtained with decreasing guide plate distance, increasing the number and height of endcap inside rib. The correlation equations of the results were obtained and compared with others. Above results of the heat transfer coefficients can be used as basic data for cooling design of the various kind of motors.

The Effect of Stator`s Slot on the Torque in the Windmill Type Ultrasonic Motor (풍차형 초음파 전동기의 고정자 슬롯이 토크에 미치는 영향)

  • 김영균;김진수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.323-326
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    • 1999
  • In this paper, a windmill type ultrasonic motor operated by single-Phase AC electric field was fabricated, and then torque characteristics were investigated. A metal-ceramic composite component was used as the stator\`s vibrator to generate ultrasonic vibrations. The windmill type ultrasonic motors has only three components; a stator element with two wind-mill shape slotted metal endcaps, a rotor and a bearing. In this parer we measured torque, when stator\`s slot was changed Iron 4, 6, 8. Brass metal was pressed with umbrella-type using metal molt then slot of 3 kind was manufactured. The maximum revolution speed was 388(rpm) in the case of a small ultrasonic motor of 11.35 mm diameter, 8 slot and 1.01 mm thickness. The maximum torque of 0.17 mNm was obtained at a speed of 131 rpm.

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Effect of Pressing Force Applied to a Rotor on Revolution Characteristics in the Windmill Type Ultrasonic Motor (풍차형 초음파 전동기의 회전자에 인가된 힘이 회전특성에 미치는 영향)

  • 김영균;김진수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.5
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    • pp.390-395
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    • 2000
  • The ultrasonic motor have recently begun to be used for certain unique practical utilizations in the fields of industrial medical consumer and automotive applications. Ultrasonic motor stimulated to ultrasonic oscillations by piezoelectrics to drive a rotor via friction contact. The metal and ceramic composite component was used as the stator element to generate ultrasonic vibrations. The ultrasonic motor used here was the windmill type ultrasonic motor operated by single-phase AC source. The windmill type ultrasonic motors has only three components; a stator element of two windmill shape slotted metal endcaps a rotor and a bearing. In this paper a prototype motor with 11.35 mm diameter was fabricated then relationship between the pressing force applied to a rotor and the rotation characteristic of windmill type ultrasonic motor are investigated when stator’s slots was changed from 4, 6, 8 and thickness changed from 0.15, 0.20 mm, respectively. Optimum pressing force applied to a rotor in the six stators was 1.2 mN.

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A Study on the Structural and Heat Transfer Analysis of the 500W-Class Optical Fiber Laser Output Transmission End Cap Module (500W급 광섬유 레이저 출력 전송 모듈 End Cap의 구조 및 열전달 해석)

  • Gao, Jia-Chen;Kim, Jae-Yeol;Heo, Sang-Hu
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.4
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    • pp.135-139
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    • 2017
  • In recent years, the optical fiber laser has been widely used in industrial fields due to its excellent economical efficiency and its suitability for industrial applications. This usage has increased even further since the KW class Laser was developed. In this paper, structural analysis and heat transfer analysis of a 500W class optical fiber laser end cap module was performed. The stability of end cap housing with the efficient heat dissipation structure of a 500W-class end cap was evaluated. This research determined the optimal design that should be applied to the design and evaluation of future KW class laser output modules.

Design of Enterprise System Platform based on Spring Data JPA in Spring Framework Environment (스프링 프레임워크 환경에서 스프링 데이터 JPA기반의 엔터프라이즈 시스템 플랫폼의 설계)

  • Yoo, Jung-Sang;Lee, Myeong-Ho
    • Journal of Convergence for Information Technology
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    • v.9 no.12
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    • pp.39-46
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    • 2019
  • The competition for standardization in the enterprise environment starts with the data tier of the back-end and the standard enterprise middle tier is being stabilized by standardization as it is accepted as the Spring Framework. In addition, with the advent of new devices in an increasingly rapid cycle, securing compatibility with web and mobile services has become an important competitive advantage for web service companies. However, companies are unable to secure competent technical personnel appropriate for the rapidly changing environment of the information generation, and the curriculum of educational universities does not reflect the demand of new competency-oriented curriculum. Therefore, in this study, in order to acquire competency-oriented skills required for such an enterprise system platform environment and to develop a curriculum, the system using Spring Data JPA in the Spring Framework environment was implemented through documenting for each analysis and design step. It aims to provide a reference model for the full stack competency-based curriculum and capstone design curriculum that can be applied immediately in the enterprise environment.