• Title/Summary/Keyword: Induction of Movement

Search Result 76, Processing Time 0.024 seconds

A Study on the Influence of Induction Coil Movement Speed and Frequency on Induction Hardening of SCM440 Steel (SCM440 강의 유도 경화에 미치는 유도코일 이동속도 및 주파수의 영향에 관한 연구)

  • Ki-Woo Nam;Ki-Hang Shin;Byoung-Chul Choi;Gum-Hwa Lee;Jong-Kyu Park
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.26 no.5
    • /
    • pp.813-823
    • /
    • 2023
  • In this study, microstructure, hardening layer hardness, and case depth were evaluated after induction hardening(IH) of base metal specimen(BM) treated with annealing and quenching-tempering specimen(QT) treated with quenching and tempering. The microstructure after IH was significantly influenced by the microstructure before IH and the induction coil heating movement speed, but the effect of the induction frequency was very small. The hardness of the hardened layer at an induction coil heating movement speed of 15 mm/s or less was more influenced by the microstructure before IH than the induction coil travel speed and induction frequency. The induction coil travel speed has the significantly effect on the case depth, the induction frequency has effect and the microstructure before IH has a small effect.

Effect of Propelling Velocity on the Restoring Force in Induction type Coil Guns

  • Kim, Ki-Bong
    • Proceedings of the KIEE Conference
    • /
    • 1994.11a
    • /
    • pp.117-119
    • /
    • 1994
  • While the projectile in the induction type coil guns is in motion, there exists an induced current in the sleeve coils of the projectile. The motion includes not only the z-axial movement but transversal movement. The projectile in coil guns, which is not supported physically, gets a force in the transversal axis to have a motion in this axis. As a result of this motion, sleeve effects are exhibited to the projectile. This paper presents the analysis of the secondary effect especially due to the propelling velocity of the projectile.

  • PDF

Development of Regeneration Inverter using 3-Level Inverter (3레벨 인버터를 이용한 직류전력 회생인버터 개발)

  • 김상균;박채운;최종묵
    • Proceedings of the KSR Conference
    • /
    • 2002.10b
    • /
    • pp.1007-1012
    • /
    • 2002
  • In this paper, a regeneration inverter is proposed using 3-level inverter. Electric regeneration means regeneration brake in electric railway vehicles. Induction motors, generally used with railway vehicles, convert the electric energy to the movement energy when vehicle is running. When the vehicle stop, the induction motor convert the movement energy to the electric energy. Usually, this energy is used with another running vehicle in the same section. If there is no vehicle around when the regeneration is occurred, regeneration energy is consumed by heat energy with resistors. The proposed inverter is capable of reuse this regeneration energy in another place.

  • PDF

Characteristic Analysis Of A Single-Sided Linear Induction Motor Taking account of Movement (이동을 고려한 편측식 선형 유도 전동기의 특성 해석)

  • Im, D.H.;Kwon, B.I.;Kim, C.E.;Jung, Y.B.
    • Proceedings of the KIEE Conference
    • /
    • 1993.07b
    • /
    • pp.1060-1062
    • /
    • 1993
  • This paper presents the dynamic analysis method of a linear induction motor by finite element method. For simulation of dynamic performance, a step by step process with respect to time is used with external voltage source and motional equation. Movement is taken into account by a combination of mesh distortion and remeshing technique.

  • PDF

3D Transient Analysis of Linear Induction Motor Using the New Equivalent Magnetic Circuit Network Method

  • Jin Hur;Kang, Gyu-Hong;Hong, Jung-Pyo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.3B no.3
    • /
    • pp.122-127
    • /
    • 2003
  • This paper presents a new time-stepping 3-D analysis method coupled with an external circuit with motion equation for dynamic transient analysis of induction machines. In this method, the magneto-motive force (MMF) generated by induced current is modeled as a passive source in the magnetic equivalent network. So, by using only scalar potential at each node, the method is able to analyze induction machines with faster computation time and less memory requirement than conventional numerical methods. Also, this method is capable of modeling the movement of the mover without the need for re-meshing and analyzing the time harmonics for dynamic characteristics. From comparisons between the results of the analysis and the experiments, it is verified that the proposed method is capable of estimating the torque, harmonic field, etc. as a function of time with superior accuracy.

Finite Element Analysis of Inverter-fed Linear Induction Motors (인버터구동 선형유도전동기의 특성해석에 관한 연구)

  • Im, Dal-Ho;Kim, Chang-Eob;Kim, Han-Jong
    • Proceedings of the KIEE Conference
    • /
    • 1995.07a
    • /
    • pp.53-55
    • /
    • 1995
  • This paper presents the characteristics of linear induction motors fed by a voltage source PWM inverter. In the calculation, 2D finite element method is used considering the movement by moving mesh. Integro-differential approach is adopted for the copper loss calculation considering the skin effect.

  • PDF

Development of induction heating superheater system using new heat exchanging method (새로운 열교환 방식을 이용한 유도가열 과열증기 발생장치 개발)

  • Sul, Yong-Tae;Lee, Eui-Yong;Kwon, Hyuk-Min
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.10 no.4
    • /
    • pp.740-746
    • /
    • 2009
  • Two step serial load induction superheater has been proposed using resonance type induction heat method in this paper. Heat method is a type of flowing the electron induction and current to special alloy heater in body from external heat coil with non-contact method. Inverter was a full bridge serial load resonance type and inductor was used as load in LC resonance design to maximize the efficiency. The developed system is a new heat exchanging method combined with electromagnetic induction heater and fluid movement, ana very accurate to control of heating the gas, liquid and evaporated mass, so on without combustion process.

Effects of bracket slot size during en-masse retraction of the six maxillary anterior teeth using an induction-heating typodont simulation system

  • Kim, Ji-Yong;Yu, Won-Jae;Koteswaracc, Prasad N.K.;Kyung, Hee-Moon
    • The korean journal of orthodontics
    • /
    • v.47 no.3
    • /
    • pp.158-166
    • /
    • 2017
  • Objective: To investigate how bracket slot size affects the direction of maxillary anterior tooth movement when en-masse retraction is performed in sliding mechanics using an induction-heating typodont simulation system. Methods: An induction-heating typodont simulation system was designed based on the Calorific Machine system. The typodont included metal anterior and resin posterior teeth embedded in a sticky wax arch. Three bracket slot groups (0.018, 0.020, and 0.022 inch [in]) were tested. A retraction force of 250 g was applied in the posterior-superior direction. Results: In the anteroposterior direction, the cusp tip of the canine in the 0.020-in slot group moved more distally than in the 0.018-in slot group. In the vertical direction, all six anterior teeth were intruded in the 0.018-in slot group and extruded in the 0.020- and 0.022-in slot groups. The lateral incisor was significantly extruded in the 0.020- and 0.022-in slot groups. Significant differences in the crown linguoversion were found between the 0.018- and 0.020-in slot groups and 0.018- and 0.022-in slot groups for the central incisor and between the 0.018- and 0.022-in slot groups and 0.020- and 0.022-in slot groups for the canine. In the 0.018-in slot group, all anterior teeth showed crown mesial angulation. Significant differences were found between the 0.018- and 0.022-in slot groups for the lateral incisor and between the 0.018- and 0.020-in slot groups and 0.018- and 0.022-in slot groups for the canine. Conclusions: Use of 0.018-in slot brackets was effective for preventing extrusion and crown linguoversion of anterior teeth in sliding mechanics.

Localization of Barley yellow dwarf virus Movement Protein Modulating Programmed Cell Death in Nicotiana benthamiana

  • Ju, Jiwon;Kim, Kangmin;Lee, Kui-Jae;Lee, Wang Hu;Ju, Ho-Jong
    • The Plant Pathology Journal
    • /
    • v.33 no.1
    • /
    • pp.53-65
    • /
    • 2017
  • Barley yellow dwarf virus (BYDV) belongs to Luteovirus and is limited only at phloem related tissues. An open reading frame (ORF) 4 of BYDV codes for the movement protein (MP) of BYDV gating plasmodesmata (PD) to facilitate virus movement. Like other Luteoviruses, ORF 4 of BYDV is embedded in the ORF3 but expressed from the different reading frame in leaky scanning manner. Although MP is a very important protein for systemic infection of BYDV, there was a little information. In this study, MP was characterized in terms of subcellular localization and programmed cell death (PCD). Gene of MP or its mutant (ΔMP) was expressed by Agroinfiltration method. MP was clearly localized at the nucleus and the PD, but ΔMP which was deleted distal N-terminus of MP showed no localization to PD exhibited the different target with original MP. In addition to PD localization, MP appeared associated with small granules in cytoplasm whereas ΔMP did not. MP associated with PD and small granules induced PCD, but ΔMP showed no association with PD and small granules did not exhibit PCD. Based on this study, the distal N-terminal region within MP is seemingly responsible for the localization of PD and the induction small granules and PCD induction. These results suggest that subcellular localization of BYDV MP may modulate the PCD in Nicotiana benthamiana.

The detection of Broken Rotor Bars in Squirrel Cage Induction Motors (농형 유도전동기의 회전자 도체 불량 검출 방법)

  • Im, Dal-Ho;Kim, Chang-Eob;Jung, Yong-Bae;Kwon, O-Mun;Park, Byung-Sup
    • Proceedings of the KIEE Conference
    • /
    • 1995.07a
    • /
    • pp.65-67
    • /
    • 1995
  • The squirrel cage rotors for induction motors may have several faults such as broken bars, bad spots in end ring, abnormal skew caused by improper processing. These faults have bad effect on the performance of the induction motor. This paper proposes the detecting technique of these faults by analyzing the current of the detecting electric magnet, using 2-D finite element method taking account of the rotor movement.

  • PDF