• 제목/요약/키워드: Induction Motor

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A Study on Energy Saving of the Motor Cooling System with an Inverter (INVERTER를 응용한 MOTOR 냉각 제어시스템의 전력절감에 관한 연구)

  • Kim, Ki-Hong;Jung, Jee-Hoon;Kwon, Bong-Hwan
    • Proceedings of the KIEE Conference
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    • 2004.11c
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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.

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Performance Tests of an Induction Motor with Hexahedron HTS Bulk Bearing (고온초전도 벌크 베어링을 사용한 유도 전동기의 특성 시험)

  • 임형우;이광윤;박명진;차귀수;이지광
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.6
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    • pp.286-290
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    • 2003
  • The high temperature superconducting bulk can be used as the bearing of induction motors. This paper presents the fabrication and test results of an induction motor with superconducting bearings using HTS bulks. The bearing had eight hexahedron type YBCO bulks. Height, width and thickness of the HTS bulk were 30mm, 30mm and 10mm, respectively. Single phase induction motor was used to drive the shaft made of aluminum and the rotor of a conventional induction motor. To estimate the performance of the HTS bulk magnetic bearing, no load test, load test and Impact test were carried out. Load tests were performed by using air resistance caused by the shaft-mounted thin cylinder with buckets. Impact tests by axial direction and vertical direction impact showed that the vibration of the shaft gradually decayed. The induction motor with HTS bulk magnetic bearing rotated silently and smoothly throughout the tests. According to the test results, conventional bearings can be replaced with superconducting magnetic bearings made of HTS bulks.

Characteristics of the Two-phase Induction Motor By the Inverter Fed Control

  • Yang Byoung-Yull;Kwon Byung-Il
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.4
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    • pp.312-316
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    • 2005
  • The single phase induction motor has been commonly applied to small-sized electrical appliances because of its low cost, but it has low efficiency and large torque ripple, and it is incapable of speed control. However, two-phase induction motors have small torque ripple, high efficiency and variable speed control, because they are inverter fed. In this paper, the dynamic characteristics of the two-phase induction motor, such as the torque ripple, current and speed, are analyzed by using the time-stepping finite element method, and compared with the cage-type single phase induction motor.

Initial Value Problem and Tuning of Induction Motor parameter in Elevetor vector control (엘리베이터용 유도 전동기 벡터 제어시의 초기 시정수 및 자동 조정)

  • Park, Sang-Young
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.176-178
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    • 1998
  • Recently, Control method of induction Motor is applied in full circuit model, as circular diagram. In Elevetor moderization problem, there is no circuit information. Nothing but, Motor terminal voltage and HP of motor. So, in this study, using KS induction Motor table, try to solve initial valve problem and make some implementations of manual tuning for use of automatic tuning of induction motor parameter.

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Compensation of the rotor time constant of induction motor using current error feedback (전류오차 궤환을 이용한 유도전동기 회전자 시정수 보상)

  • 김승민;이무영;권우현
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.195-198
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    • 1997
  • This paper proposes the effective compensation method of the rotor time constant of induction motor. An indirect vector control method is highly dependent on the motor parameters. To solve the problem of performance degradation due to parameter variation in an indirect vector control of induction motor, we compensate the rotor time constant by current error feedback. The proposed method is a simple on-line rotor time constant compensation method using the information from terminal voltages and currents. As the current error, difference between current command and estimated current, approaches to zero, the value of rotor time constant in an indirect vector controller follows the real value of induction motor. This scheme is valid transient region as well as steady state region regardless of low or high speed. This method is verified by computer simulation. For this, we constructed the simulation model of induction motor, indirect vector controller and current regulated PWM (CRPWM) voltage source inverter (VSI) using SIMULINK in MATLAB.

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Torque characteristic of single phase induction motor for phase control mode (위상 제어 방식 단상유도전동기의 토크 특성)

  • Kim, Cherl-Jin;Choi, Chul-Yong;Lee, Dal-Eun;Yoon, Shin-Yong;Baek, Soo-Hyun
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.107-109
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    • 2003
  • Single phase induction motor is directly used usual source, it can be a source of an appliance such as mechanical fan, refrigerator, washing machine, etc. Especially capacitor-run single phase induction motor is suitable to make more inexpensive and high efficient products because it is more high efficiency, and good to start than other single phase induction motors. Generally, voltage and current of capacitor-run single phase induction motor transfer to the part of positive phase and negative phase based on two motor theory. In this paper, we simulate the torque characteristics to capacitance variation from single phase induction motor's equivalent circuit. Through the test using the real motor, we compare and investigate the maximum torque of run state related with capacitance and the adequacy of the converted model.

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Speed Sensorless Torque Monitoring of Induction Spindle Motor using Graphical Programming (그래픽 프로그래밍 기법을 이용한 주축용 유도전동기의 속도 센서리스 토크감시)

  • Park, Jin-U;Gwon, Won-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.10
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    • pp.107-113
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    • 2002
  • To monitor the torque of an induction motor using current, rotating speed has been measured and used to calculate the slip angular velocity. Additional sensor, however, can cause extra expense and trouble. In this paper, a new algorithm is proposed to monitor the torque of vector controlled induction motor without any speed measuring sensor. Only stator current is measured to estimate the magnetizing current which is used to calculate flux linkage, rotor velocity and motor torque. Graphical programming is used to implement the suggested algorithm and to monitor the torque of an induction motor in real time. To solve the fluctuation problem of estimated torque caused from instantly varying rotating speed of an induction motor, the rotating speed is reconstructed based on the measured current signals. From several experiments, the proposed method shows a good estimation of the motor torque under the normal rotational speed.

Current Control of Induction Motor using Neural Networks (신경 회로망을 이용한 유도 전동기의 전류제어)

  • Park, Young-Soo;Seo, Ho-Joon;Kim, Seong-Hwan;Seo, Sam-Jun;Kim, Dong-Slk;Park, Gwi-Tae
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.66-68
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    • 1997
  • In this paper, our interest is the identification and control of nonlinear dynamic plant, induction motor, by using neural networks. We usually use vector control in the induction motor such as in the DC motor. When we go over the inputs of voltage source invertor, we can find that torque current and flux current couple each other in the induction motor. Before putting control inputs in the system, we should remove the coupling terms which we already know from them. But we should consider that cross coupling terms have time-varying variables. In this paper, we identified the parameter of induction motor by using neural networks and designed the controller with identified parameters. Through this procedure we obtained compensated inputs which are decoupled each other. Using induction motor currents control, we can make the d axis current hold constant value and control the q axis current at the same time.

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Starting Characterization of Induction Motor using Reactor Tap Change (리액터 탭 절환에 의한 유도전동기의 기동 특성)

  • Kim, Jong-Gyeum
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.1
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    • pp.24-28
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    • 2014
  • An induction motor is most widely used to obtain driving force in the industrial field. The induction motor is generated a high current at starting. A starting current is often more than five times of rated current. A high starting current can cause problems such as voltage drop in the power system. In order to solve these problems, a reactor starting method has been widely applied in a large motor capacity. There are differences in the operating characteristics of induction motor corresponding the switching time of reactor tap. In this study, I analyzed that current, torque, power of induction motor are different from changing time and tap setting values of reactor tap.

Parameter Identification of an Induction Motor Drive with Magnetic Saturation for Electric Vehicle

  • Jeong, Yu-Seok;Lee, Jun-Young
    • Journal of Power Electronics
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    • v.11 no.4
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    • pp.418-423
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    • 2011
  • This paper presents a simulation model and a parameter identification scheme of an induction motor drive for electric vehicle. The induction motor in automotive applications should operate in very high efficiency and achieve the maximum-torque-per-ampere (MTPA) feature even with saturated magnetic flux under very high torque. The indirect vector control which is typically adopted in traction drive system requires precise information of motor parameters, particularly rotor time constants. This work models an induction motor considering magnetic saturation and proposes an empirical identification method using the current controller in the synchronous reference frame. The proposed method is applied to a 22kW-rated induction motor for electric vehicle.