• Title, Summary, Keyword: induction motor

Search Result 2,657, Processing Time 0.067 seconds

A Study on Stabilization of Multi-Excited Induction Motor (다중여자 유도전동기의 안정도에 관한 연구)

  • 강만원;김한성
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.9 no.4
    • /
    • pp.78-85
    • /
    • 1995
  • This paper covers stability and stabilization of Multi-Excited Induction Motor used in numberous electric equipment system of industrial field. The induction motor with multi-excitation has tow sets of three-phase system : One is connected to the AC source to supply most power required at the load, and the other is to the inverter for variable frequency and/or magnitude of voltage. The conventional induction motor is operated under single excitation mode only, that is called induction mode. But in multi-excited induction motor both the induction mode and the synchronous mode are possible, and the proposed multi-excited induction motor can be driven as a synchronous motor by the extra three-phase input. At the synchronous mode the efficiency is improved so higher than that at induction mode or conventional induction motor. The rating of the inverter used for speed control of numberous electric equipment system can be reduced upto one-tenth of that for conventional induction motor. Also the cost and maintenance fee of multi-excited induction motor can be reduced compared to any other motor.

  • PDF

A Study on the outside rotor type double squirrel cage Induction motor (외측회전형 이중 농형 유도전동기에 관한 연구)

  • 김현수;배철오;안병원
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.27 no.6
    • /
    • pp.776-782
    • /
    • 2003
  • This paper describes a newly developed double squirrel cage induction motor in which the rotor is located outside the stator. The outside rotor type brushless dc motor has been used for VTR's head drum and PC's cooling fan, but this kind of induction motor has not been developed yet. The parameters of outside rotor type induction motor were measured from the locked rotor test and no load test. It is possible to determine the parameters which are presented in the steady-state equivalent-circuit of the outside rotor type induction motor. Load test of induction motor was carried out using a dynamometer. For the characteristics of torque, efficiency, power factor and output. the developed double squirrel cage induction motor is compared with the ordinary induction motor It is believed that the results of this paper can be used for the development of the outside rotor type induction motor.

Analysis for the Operating Characteristics when the Induction Motor is Used as a Generator (유도전동기를 발전기로 사용시 동작 특성 해석)

  • Kim, Jong-Gyeum
    • New & Renewable Energy
    • /
    • v.10 no.2
    • /
    • pp.5-11
    • /
    • 2014
  • Squirrel cage induction motor is the main driving system of industrial field and familiar with its use in a large variety of applications. The structure and operating characteristics of induction generator is almost identical to induction motor, but the induction generator part is used restrictively from hydropower power and wind power development etc. Recently induction generator is commonly used for micro & small hydro power applications due to its simplicity, reliability, low cost and robustness. Input and output of induction motor has turned against at the induction generator operation. Rotation speed of induction generator is small faster than synchronous speed of induction motor. As output of induction machines increases with the increasement of speed, so loss is same. Actually, generator efficiency is lower than motor at this condition. If induction generator is connected with mechanical load such as increaser, total efficiency is decreased. Consequently the quality in compliance with an induction motor parameter applying like that in the generator is a possibility of having the error of some. In this paper, we analyzed that input, output, torque and efficiency of induction machine is different from each other above and below synchronous speed.

Study on Pulling-Into-Step of Induction Synchronous Motor (유도동기전동기의 동기화 한계에 관한 연구)

  • 박민호;홍순찬
    • 전기의세계
    • /
    • v.24 no.2
    • /
    • pp.78-83
    • /
    • 1975
  • There are many studies recently, on a wound rotor induction motor operation as synchronous rotating speed, and such an induction motor is so called an induction synchronous motor. In above desciption the region of pull into-step that the wound rotor induction motor as a synchronous motor has not been calculated. This paper deals with such a region. Generally, induction synchronous motor is different from a synchronous motor in many respects. In considering these respects, characteristic equations of motion for this motor are induced adoption small signal linearization, continuous quasili-nearization and state variable grouping technique. For pulling-into-step of Induction Synchronous Motor, we first analyze these equations with digital computer and compare the former with datas calculated by motor experimentation.

  • PDF

A Study on Design of Linear Induction Motor in Dynamic Tester for Catenary-current Collection (주행 집전계 시험기의 주행 대차용 선형 유도전동기 설계에 관한 연구)

  • Ham, Sang-Hwan;Cho, Su-Yeon;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.60 no.4
    • /
    • pp.771-775
    • /
    • 2011
  • This paper presents design process of linear induction motor in dynamic tester for catenary-current collection. To minimize length of rail for dynamic tester for catenary-current collection, accelerating performance of the linear induction motor is very important. So the design process of linear induction motor considered in this paper is different with general design process of linear induction motor, because dynamic tester has three type driving region, as accelerating region, constant speed region, and braking region. Considering accelerating performance of motor, distance and time from starting point to constant speed region were concerned for load condition of motor. Designed linear induction motor was analyzed by 2-dimensional finite element method. Using mechanical dynamics simulation with analysis result of 2-dimensional finite element method and accelerating performance of designed motor was proved.

Characteristic Comparison Analysis for Standard and High-Efficiency Induction Motor (일반 및 고효율 유도 전동기의 특성 비교 해석)

  • Kim, Jong-Gyeum
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.56 no.4
    • /
    • pp.186-190
    • /
    • 2007
  • This paper presents an analysis on the power characteristics of standard and high-efficiency induction motor. The parameter of induction motor play an important role in the expression of machine's performance characteristics. Induction motor can be differently found its characteristics parameters with the operation under the same capacity. So it is very difficult to detect correct parameter of induction motor. For the analysis, we discovered the motor parameters by the technical program with nameplate data. In this paper, we analyzed that how power and torque characteristics of induction motor would be changed for two kinds of motor parameters.

Study on Losses Segregation for Capacitor-Run Single Phase Induction Motor (커패시터 구동형 단상유도전동기의 손실분리에 대한 연구)

  • Kim, Kwang-Soo;Kim, Ki-Chan;Lee, Sung-Gu;Go, Sung-Chul;Chun, Yon-Do;Lee, Chul-Kyu;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.9
    • /
    • pp.1546-1551
    • /
    • 2008
  • This paper is concerned with the problems of accurate losses segregation in capacitor-run single phase motor. Segregation of losses in single phase induction motor is more complicated than that in three phase induction motor, because of the backward magnetic field component in the motor. Generally there are two methods for losses segregation of single phase induction motor. The one is relatively complicated method based on parameter estimation of single phase induction motor. By the way, the other one is simplified method based on IEEE Standard 114. All of the methods for the experimental determination of single phase induction motor losses are studied in this paper. Since the IEEE Standard is not possible to be applied for all type of single phase induction motors, we modified that method to apply for losses segregation of capacitor-run single phase induction motor as unifying the method based on parameter estimation.

Characteristics Analysis for Motor or Generator Operating of Induction Machine with Deep or Double Cage Rotor (심구 또는 이중 농형 회전자를 가진 유도기의 전동 또는 발전 운전시 특성 해석)

  • Kim, Jong-Gyeum
    • New & Renewable Energy
    • /
    • v.10 no.4
    • /
    • pp.3-8
    • /
    • 2014
  • Both of induction generator and synchronous generator is available in the hydroelectric power plant. If the output of the power station is large, the synchronous generator is mainly used but when its output is low, the induction generator is often used. If the output capacity is small, there is a case in which induction motor is used as a generator. Torque at rated operation and start of the induction motor is different depending on the shape of the rotor. Small and medium-sized squirrel-cage induction motor is used primarily double cage rotor or deep bar. In this study, we attempt to interpret characteristics for double cage rotor or deep bar that occur when operating in the induction generator based on the parameters that have been designed and manufactured as an induction motor.

Study on the Air-bearing Stage Driven by Linear Induction Motors (선형 유도기 구동 방식 공기 베어링 스테이지에 관한 연구)

  • Jung, Kwang-Suk;Shim, Ki-Bon
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.27 no.6
    • /
    • pp.39-46
    • /
    • 2010
  • Linear induction motor is adopted as an actuator of the planar stage. An inherently poor characteristic at zero or ultra-low speed zone of the induction motor is remarkably improved due to a recent development of power electronic semiconductor technology and a spatial vector control theory. At present, a servo response speed of the induction motor reaches 90 percent of one of PM synchronous or BLDC motor. Specially, as a secondary of the induction motor can be constructed using uniform conducting sheets, there is no periodic force ripple as in PM motors. So, the induction motor can be superior to another driving means under a certain condition. This paper discusses the overall development procedure of non-contact planar stage with a big workspace using linear induction motors.

Analysis of Doubly-Excited Induction Motor (이중여자 유도전동기의 해석)

  • Kang, Man-Won;Kim, Han-Sung
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1095-1097
    • /
    • 1993
  • The double excited induction motor has two sets of three-phase system : One is connected to the ac source to take care of energy convertion, and the other is to the inverter controlable frequency and/or magnitude of voltage, both of the induction mode and the synchronous mode are possible in double excitation motor, and the proposed double excitation motor can be driven as a synchronous motor by the extra three-phase input. At the synchronous mode the efficiency is improved so higher than that at induction mode or induction motor. The rating of the inverter used for speed control can be reduced upto one-fifth of that for conventional induction motor. Also the cost and maintenance fee of double excitation induction motor can be reduced compared to any other motors.

  • PDF