• Title/Summary/Keyword: Induction Motor

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Speed Sensorless Torque Monitoring On CNC Lathe Using Internet (인터넷을 이용한 CNC 선반의 속도 센서리스 토크감시)

  • 홍익준;권원태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.467-470
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    • 2002
  • Internet provides the useful method to monitor the current states of the machine tool no matter where a personnel is monitoring them. In this paper, a monitoring method of the torque of the machine tool's spindle induction motor using internet is suggested. The torque of vector controlled induction motor is estimated without speed measuring sensor. Only stator currents are 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, to monitor the torque of an induction motor in real time and to make the estimated torque monitored on client computers. 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. Mechanical part of the machine tool is also reconstructed using the data obtained from preliminary experiments. Torque of the spindle induction motor is well monitored on the client computers with 3% error range under various cutting conditions.

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The Simulation of Constant Speed Control Characteristics for Linear Induction Motor using Matlab Simulink (Matlab Simulink를 이용한 선형 유도전동기의 속도제어특성)

  • Kim Seong Kyeol;Na Jong Duk;Cho Geum Bae;Baek Hyung Lae
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1223-1225
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    • 2004
  • In difference with the rotary type electrical machinery, the linear induction motor(LIM) that generates the direct thrust directly, is widely used for the operation system of electrified railroad, elevation system, conveyer system, and so on. The operational principle of linear induction motor is constructively similar to the general rotary induction motor. It is difficult to realize the complicate linear induction motor which is applied SVPWM system, but widely used in vector motor control system or servo control system because of its high performance in current control. In this paper, we presented the dynamic characteristic analyzing methode, and calculated efficiently the end effect by using equivalent circuit methode in the operating linear induction motor control system for Maltlab simulink modeling.

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Maximum Efficiency Drive of Vector-Controlled Induction Motors (벡터제어 유도전동기의 최대효율 운전)

  • Yoon, Duck-Yong;Choe, Gyu-Ha;Hong, Soon-Chan;Baek, Soo-Hyun;Lee, Eun-Woong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.1 no.1
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    • pp.27-37
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    • 1996
  • This paper proposes the control algorithm for maximum efficiency drive of PWM inverter - induction motor system with high dynamic performance. If the induction motor is driven under light load with rated magnetizing current, the Iron loss is excessively large compared with the codder loss which results in doer motor efficiency. Maximum efficiency drive of an induction motor can be achieved by controlling the magnetizing current to satisfy the optimal ratio that leads the total motor loss to be a minimum value at a given speed. The proposed control algorithm essentially uses vector control technique and adopts voltage decoupling control strategy to prevent the degradation of dynamic performance due to reduced magnetizing current. To verify the proposed method, digital simulations and experiments are carried out for a squirrel-cage induction motor with the rating of 2.2[kW].

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A Study of Winding Design for Capacitor Run Single phase Induction Motor (커패시터 구동형 단상유도전동기의 권선설계에 대한 연구)

  • Ham, Sang-Hwan;Im, Jong-Bin;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.4
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    • pp.776-780
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    • 2011
  • This paper is concerned with winding design in capacitor-run single phase motor. Winding design in single phase induction motor is more complicated than that in three phase induction motor, because of using concentric winding in the single phase. Various winding designs are possible, and accordingly layout of the slot is calculated by formula. And then accurate design of winding is available. Using the design process in this paper, we can get the base model with slot layout and turns of windings of 1.12 kW single phase induction motor, and it is verified by finite element analysis. In this paper, winding design and winding layout of single-phase induction motor using concentric winding are suggested.

Design and Experimental Investigation of High-Speed Three-Phase Induction Motor for Turbo Blower

  • Kim, Young-Kwan;Lee, Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.3
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    • pp.59-65
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    • 2008
  • High-speed electrical motor has been studied for several applications, i.e. for direct-drive systems of centrifugal compressors and turbo blowers. This paper deals with a design consideration of electromagnetic, mechanical and thermal limits of high-speed induction motor for turbo blower. Basic design concept of high-speed motor was proposed. As the motor is to be operated at high speed, the losses are quite different from conventional low-speed machines. Especially, the increases of rotor eddy current and friction losses could lead to an overheated motor. So, we suggested a special cooling system to reduce temperature rise. And, based upon this design concept, the prototype induction motor(37[kW], 45,000[rpm]) for high-speed turbo blower was designed and 2-D electromagnetic field analysis was implemented. Finally, criteria to evaluate the characteristics of high-speed induction motor have been proposed and tested.

Optimizing Design Variables for High Efficiency Induction Motor Considering Cost Effect by Using Genetic Algorithm

  • Han, Pil-Wan;Seo, Un-Jae;Choi, Jae-Hak;Chun, Yon-Do;Koo, Dae-Hyun;Lee, Ju
    • Journal of Electrical Engineering and Technology
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    • v.7 no.6
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    • pp.948-953
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    • 2012
  • The characteristics of an induction motor vary with the number of parameters and the performance relationship between the parameters also is implicit. In case of the induction motor design, we generally should estimate many objective physical quantities in the optimization procedure. In this article, the multi objective design optimization based on genetic algorithm is applied for the three phase induction motor. The efficiency, starting torque, and material cost are selected for the objectives. The validity of the design results is also clarified by comparison between calculated results and measured ones.

A Study on Development of Small Motor Core Die for High Efficiency Induction Motor (고효율 유도전동기 소형 모터코어 금형개발에 관한 연구)

  • Lim, Sae-Jong;Kim, Sei-Hwan;Choi, Kye-Kwang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.2
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    • pp.455-460
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    • 2010
  • The high-efficiency induction motor reduces the generation loss of conventional induction motors and saves energy with less electricity consumed, enabling the return of initial facilities investments on a shorter-term basis due to its low operation cost and allowing the extension of the life of the motor. Poscore has entered the phase of development of high-efficiency induction motor based on its experiences to date in cooperation with electricity researchers. This paper examines the development of the small motor die for the high-efficiency induction motor.

Analysis on the Effect of Filter to Mitigate Transient Overvoltage on the High Voltage Induction Motor Fed by Multi Level Inverter using EMTP (EMTP를 이용한 멀티레벨 인버터 구동 고압유도전동기에서 발생하는 과도과전압 저감필터의 효과분석)

  • Kwon, Young-Mok;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.10
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    • pp.82-93
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    • 2006
  • In this paper, filters are designed to reduce transients overvoltage in inverter fed high-voltage large-capacity induction motor drive system. Design issues for a LCR filter at the inverter output terminals to reduce the dv/dt of the inverter output pulse and a RC filter at the induction motor input terminals to match the characteristic impedance between cable and induction motor are examined in detail. These filters are modeled to be suitable to high-voltage large-capacity induction motor. The performance of the filter is evaluated through simulation using EMTP(ElectroMagnetic Transients Program). We presented filters that used high voltage large-capacity induction Motor on the basis of this. Effect of the filter is analyzed for variation of the cable length. Characteristics of filters are analyzed to reduce harmonic in voltage waveform of induction motor input terminal. The switching surge voltage became the major cause to occur the insulation failure by serious voltage stress in the stator winding of induction motor. Filter for to mitigate transients overvoltage presents a required component in drive system of high-voltage large-capacity induction motor. Also, proposed filters are proved through simulation using EMTP.

A Study on Analysis of Inverter-fed Induction Motor's Bearing Current using Improved Equivalent Ciruit Parameters (개선된 등가 파라미터를 이용한 인버터 구동 유도전동기의 축전류 해석에 관한 연구)

  • Kim, Byung-Taek;Koo, Dae-Hyun;Hong, Jung-Pyo;Kwon, Byung-Il;Jun, Ji-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.4
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    • pp.683-692
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    • 2007
  • An inverter driven induction motor has more superior dynamic characteristic than sine wave driven induction motor. But it has a problem with shaft voltage and bearing current in drive-motor system. This paper presents the analysis of bearing current in inverter-fed induction motor. The proposed method is based on using numerical method (FEM) to derive parasitic parameters in motor. Using the electric field analysis with FEM, the stored energy in dielectric materials of the motor can be calculated and the parasitic capacitances are obtained. Then we compared the proposed method with a conventional method in variable frequency and load conditions. From the comparision of simulation and experiment result, we confirmed that the proposed method is valid.