• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
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• pp.202-203
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• 2007

Induction Motor is important at tilting train. Tiling train induction motor should be operated to commercial servicespeed 180km/h at Korea Conventional Line upgrade railroad. As the induction motors are without commutators, maintenance is easy and it is far lighter than the conventional motors with the same capacity. The induction motor, however, posed problems in use as its motor torque is not large enough compared with DC motors. With the recent advances in power semiconductors, it is possible to apply the induction motors to trains by applying VVVF inverter control method to the traction motor. In this study, we realize the stable measurement AC motor temperature characteristic of TTX train.

• 한국정밀공학회지
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• 제27권6호
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• pp.39-46
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• 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.

• 한국철도학회논문집
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• 제13권2호
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• pp.173-178
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• 2010

전기철도는 전력공급시스템과 전기차로 구성되어 있다. 전기철도의 전기차는 대규모의 견인력을 얻을 수 있어 대량수송과 고속운전에 적합하다. 전기차는 모터블록과 견인전동기에 의해서 구동되며, 지령속도에 따라 모터블록에서 견인전동기에 전력을 공급하여 속도가 제어된다. 전기차의 속도제어는 모터블록과 견인전동기의 최소 에너지로 속도를 제어하는 것이 목표이다. 최근의 견인전동기는 직류 및 동기전동기에서 유도전동기를 사용하고 있다. 대부분의 유도전동기는 벡터제어기법을 사용하여 유도전동기의 속도를 제어한다. 본 논문에서는 유도전동기의 벡터제어기법을 이용하여 유도전동기의 속도를 제어하였다. Simulink를 이용하여 제어시스템을 모델링하고, PI 제어기와 Hysteresis 제어기를 이용하여 펄스를 제어하여 전동기의 속도를 제어하였다. 실시간 제어를 위해 IGBT 인버터를 사용하였고, 유도전동기 구동실험에 의해 시스템 성능을 입증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.611-613
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• 2004

This paper is concerned with the simulation and determination of the input voltage and frequency for the optimal efficiency operation of induction motors. In general, induction motors have a specific character that operation efficiency is dropped sharply at the light roads condition. Consequently, if the induction motor is controlled by high efficiency using the VVVF(variable voltage variable frequency) control methods at optimal values, the entire system can obtain the substantial energy savings from the efficiency improvement in induction motors. In this paper, optimal slip is derived from the modeling of an induction motor and the optimal hybrid-control method is suggested by the simulation of the proposed algorithm for a 3-phase induction motor.

• Journal of Advanced Marine Engineering and Technology
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• 제34권6호
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• pp.887-893
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• 2010

기관실 시뮬레이터에서 3상유도전동기에 대한 모델링을 단순하게 처리하는 경우에는 왜곡된 특성에 의해 각종 전기 기계적 모의 성능 수준이 크게 저하된다. 한편, 전동기 특성을 1, 2차 측 파라미터로 구분하는 기존의 등가회로 방식들은 복잡한 실험을 거치거나 상세 기술 자료가 확보되지 않고는 현장 전동기에 대한 회로에서의 파라미터 값들을 확정하지 못한다는 점에서 정격제원 정도만 주어지는 기관실 시뮬레이터의 개발 작업 환경에서는 사용할 수가 없다. 이러한 문제의 해결을 위해 본 논문에서는 최소 파라미터에 의한 전원 직결의 2 회로정수 방식 등가회로를 제시하였으며 이로부터 정격제원에 의해 회로정수가 결정되기까지의 조건과 과정 및 관련 식들을 해석하였다. 또한 실제 전동기에 이를 적용하여 얻어지는 특성곡선들을 통해 임의의 전동기에 대한 근사특성과 실용성을 확인하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1997년도 전력전자학술대회 논문집
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• pp.156-160
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• 1997

This paper proposed the vector controller of induction motors using one chip microprocessor. For developing a small and cheep speed control system, we use the one chip microprocessor 80C196MC. By using the one chip microprocessor we can make an inexpensive and small-sized vector controller for induction motors. We apply indirect vector control method and space vector modulation method to this system. The experimental results show that the proposed inverter has high performance features.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1253-1256
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• 1996

In this paper, a new nonlinear feedback linearization control scheme for induction motors is developed. The control scheme employs a fuzzy nonlinear identification scheme based on fuzzy basis function expansion to adoptively compensate the parameter variations, i.e. rotor resistance, mutual and self inductance etc. An important feature of the proposed control scheme is to incorporate the sliding mode controller into the scheme to speed up convergence rate. Simulation tests show the robust behavior of the proposed controller in the presence of the parameter uncertainties of the machine.

• 대한전기학회논문지
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• 제33권12호
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• pp.480-484
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• 1984

A speed control system of multiple induction motors is presented in this paper. The system consists of a single CSI, several wound retor type induction motors, and the choppers which control the rotor current of motors. Some performance characteristics are studied, and the closed control loop is suggested.

• 전기학회논문지
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• 제62권12호
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• pp.1668-1677
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• 2013

This paper deals with the power loss and thermal characteristics of induction motor for machine tools according to the rated power and speed. To reduce the fabrication error by thermal strain in rotational machine tools, we calculated the power loss and thermal behavior of induction motors. Firstly, the inverse design of general induction motors for machine tool spindle has been performed. The inverse design results are compared with the torque-speed characteristic curve in motor's catalog. The power loss are calculated by finite element method(FEM) at rated condition. Secondary, the transient thermal characteristics of induction motors are calculated by equivalent thermal resistance model from Motor-CAD S/W. The inverse design, power loss and thermal behavior calculation for induction motors with various rated power and speed has been performed. Finally, to verify the design and calculation process of induction motor, we implemented the experimental set with 0.4kW 1710rpm class industrial induction motor model. The obtained thermal characteristics of experimental model confirmed that the design and power loss calculation processes are appropriate to the prediction of thermal strain in rotational machine tools.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.338-345
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• 2013

Induction motors play an increasing importance in industrial manufacturing. Therefore, the state monitoring systems also have been considering as the key in dealing with their negative effect by absorbing faulty symptoms in motors. There are numerous proposed systems in literature, in which, several kinds of signals are utilized as the input. To solve the multiple faults problem of induction motors, like the proposed system, the vibration signals is good candidate. In this study, a new signal processing scheme was utilized, which transforms the time domain vibration signal into the spatial domain as an image. Then the spatial features of converted image then have been extracted by applying the dominant neighbourhood structure (DNS) algorithm. In addition, these feature vectors were evaluated to obtain the fruitful dimensions, which support to discriminate between states of motors. Because of reliability, the conventional one-against-all (OAA) multi-class support vector machines (MCSVM) have been utilized in the proposed system as classifier module. Even though examined in severity levels of signal-to-noise ratio (SNR), up to 15dB, the proposed system still reliable in term of two criteria: true positive (TF) and false positive (FP). Furthermore, it also offers better performance than five state-of-the-art systems.