• Title, Summary, Keyword: electric machine

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A study and implementation of a 30kV highly isolated DC-DC converter (30kV 절연성능을 갖는 고절연 DC-DC 컨버터에 관한 연구)

  • Kim, Jeongwoo;Bu, Hanyoung;Cho, Younghoon;Kim, Ho-Sung;Cho, Jintae
    • Proceedings of the KIPE Conference
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    • pp.355-356
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    • 2017
  • In this paper, a highly isolated DC-DC converter is designed as a power supply, and an insulator-molded transformer is used to achieve high insulation performance. Finally, the insulation performance of the power supply was verified by experimental results.

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A Experimental Study on the Fire Safety of Drum-type Electric Washing Machine (드럼세탁기 화재안전성 확보를 위한 실험연구)

  • Hong, Sung-Ho;Lee, Sang-Hyun;Park, Sang-Tae;Yu, Hyun-Jong;Jeon, Woong-Jae
    • Proceedings of the KIEE Conference
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    • pp.131-133
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    • 2008
  • This study presents on the analysis fire hazards of drum type electric washing machine. In order to analyze fire hazards fire experiment is conducted. The fire experiment is conducted to simulate under the normal condition and abnormal condition. The experiment under the abnormal condition is simulated in safety device failure, situation of accumulated dust and tracking phenomenon caused by humidity. The results show that fire hazard is high at the abnormal condition. In this paper, we suggest to use the safety device of low operating temperature in electric washing machine for reducing fire hazard.

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Iron Loss Analysis of Electric Machine Considering Vector Magnetic Properties of Electrical Steel Sheet (전기강판의 벡터 자기특성을 고려한 전기기기의 손실특성 해석)

  • Yoon, Heesung;Koh, Chang Seop
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1813-1819
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    • 2012
  • This paper presents vector magnetic properties of an electrical steel sheet (ESS) employed for electric machine and iron loss analysis considering the vector magnetic properties of the ESS. The vector magnetic properties of the ESS are measured by using a two-dimensional single sheet tester and modeled by an E&S vector hysteresis model to be applied to finite element method. The finite element analysis considering the vector magnetic properties is applied to iron loss analysis of a three-phase induction motor model, and the influences of the vector magnetic properties on the iron loss distribution are verified by comparing with numerical results from a typical B-H curve model.

The Practical Method and Experimental Verification of Temperature Estimation in the Permanent Magnet of Electric Machine

  • Kang, Kyongho;Yu, Sukjin;Lee, Geunho;Lee, Byeong-Hwa
    • Journal of Magnetics
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    • v.20 no.4
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    • pp.421-426
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    • 2015
  • This paper presents a practical method for estimation of average temperature in the permanent magnet (PM) of electric machine by using finite element analysis (FEA) and dynamo load experiment. First of all, the temperature effect of PM to the torque has been employed by FEA in order to evaluate the Temperature-Torque characteristic curve. The 1st order polynomial equation which is torque attenuation coefficient is derived by the FEA result of the Temperature-Torque curve. Next, torque saturation test with constant current condition is performed by dynamo load experiment. Then, the temperature trend can be estimated by adding the initial starting temperature using the torque attenuation coefficient and torque saturation curve. Lastly, estimated temperature is validated by infrared thermometer which measures temperature of PM surface. The comparison between the estimated result and experimental result gives a good agreement within a deviation of maximum $8^{\circ}C$.

Development of the ultra-high speed electric injection molding machine using the energy regeneration method (에너지 회생 기법을 사용한 초고속 전동 사출성형기 개발)

  • Yu, Hyeon-Jae;Yoo, Sung-Chul;Hyun, Chang-Hoon;Park, Kyoung-Ho
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.10 no.2
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    • pp.1-5
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    • 2016
  • High-speed and high-torque performance is required in the ultra-high speed electric injection molding machine field. To implement this performance, the big-size inverter is needed and the corresponding converter should be used. In this case, the whole cost for configuring the system will be increased. In this paper, we introduce a method which is able to reduce the energy and the cost for configuring the system using the energy regeneration. The energy regeneration method is based on reusing the regeneration power generated at the electric motor during decelerating the injection motion. In this paper, we demonstrate the effectiveness of the method by using the ultra-high speed injection motion.

Studies on magneto-electro-elastic cantilever beam under thermal environment

  • Kondaiah, P.;Shankar, K.;Ganesan, N.
    • Coupled systems mechanics
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    • v.1 no.2
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    • pp.205-217
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    • 2012
  • A smart beam made of magneto-electro-elastic (MEE) material having piezoelectric phase and piezomagnetic phase, shows the coupling between magnetic, electric, thermal and mechanical under thermal environment. Product properties such as pyroelectric and pyromagnetic are generated in this MEE material under thermal environment. Recently studies have been published on the product properties (pyroelectric and pyromagnetic) for magneto-electro-thermo-elastic smart composite. Hence, the magneto-electro-elastic beam with different volume fractions, investigated under uniform temperature rise is the main aim of this paper, to study the influence of product properties on clamped-free boundary condition, using finite element procedures. The finite element beam is modeled using eight node 3D brick element with five nodal degrees of freedom viz. displacements in the x, y and z directions and electric and magnetic potentials. It is found that a significant increase in electric potential observed at volume fraction of $BaTiO_3$, $v_f$ = 0.2 due to pyroelectric effect. In-contrast, the displacements and stresses are not much affected.

Vibration Characteristics and its Propagation Path Analysis of an Electric Drill (전동드릴의 진동특성 및 전파경로 해석)

  • 김도현;조윤수;최연선
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.166-171
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    • 2001
  • An electric drill is a handy tool used in a machine shop, which consists of motor, gear, bearing, shaft, and case, i.e., a gear driving system. Low level vibration and noise of the electric drill can bring the assurance of the quality and reliability of the machine. The vibration sources of the electric drill should be investigated for the reduction of the vibration and noise of the system. Through the experiments in a laboratory and the various signal processing procedure for the measured vibration and sound signals, the characteristics of the vibration and noise of the electric drill are investigated. And its propagation path is sought using partial coherence technique.

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Power Distribution and Coordinated Control for a Power Split Hybrid Electric Bus

  • Wang, Feng;Zhong, Hu;Ma, Zi-Lin;Mao, Xiao-Jian;Zhuo, Bin
    • Journal of Electrical Engineering and Technology
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    • v.3 no.4
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    • pp.593-598
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    • 2008
  • The power distribution is proposed to determine the target operating points of the system components as the basis for maximal the efficiency of the overall system for a power split dual electric machine hybrid electric bus. The coordinated control is constructed on the basis of the power distribution. The basic coordinated control is implemented to satisfy the driver's power demand, in which both the dynamic characteristics of the engine and the dual electric machine are explicitly taken into account. Moreover, the improved coordinated control is suggested to suppress engine dynamic operation and rich fuel injection.

General Characteristic of Fractional Slot Double Layer Concentrated Winding Synchronous Machine

  • Seo, Un-Jae;Chun, Yon-Do;Choi, Jae-Hak;Chung, Shi-Uk;Han, Pil-Wan;Koo, Dae-Hyun
    • Journal of Electrical Engineering and Technology
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    • v.8 no.2
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    • pp.282-287
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    • 2013
  • The concentrated winding configurations offer significant advantage for reducing end windings. These machines are generally used in low speed high torque application due to relatively low copper loss. However, numbers of fractional slot construction make the designer hard to properly choose pole and slot numbers for the certain application. This paper provides the general information of possible fractional slot concentrated double layer winding machine.