• Title/Summary/Keyword: DC Shunt Motor

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Speed Characteristics of Direct Current Shunt Motors (직류 분권전동기의 속도 특성)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.3
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    • pp.69-72
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    • 2012
  • It is well known that speed of a direct current shunt motor is inverse proportional to flux. This paper presents speed expression to show that speed is not inverse proportional to flux. The presented speed vs. flux curves are verified by experimental result that shows the need of the revision of speed vs. flux curves shown in conventional text books.

Commutation Modeling and Characteristic Analysis of DC Motor using Circuit Parameters (회로정수를 이용한 직류전동기의 정류회로 모델링 및 특성 해석)

  • Kim, Young Sun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.1
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    • pp.57-62
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    • 2013
  • Because of high torque and easiness of speed control, Direct Current(DC) motors have been used for a long time. But, its applications are limited in circumstance and performance, since they contained brush and commutator. The commutation characteristic gives effect to life and performance of the DC motor. Naturally, the commutation characteristic analysis is strongly required. In this paper, With the result of finite element analysis, The inductance is calculated each rotor position and applied to the voltage equations coupled with commutation equation. Also, contact resistances of brush/commutator assembly are considered using contact area and brush width converted with commutator segments. The time derivative term in the differential equation is solved in time difference method. This algorithm was applied to 2-pole shunt DC motor. We considered commutation characteristic by changing contact resistance between brush and commutator segment.

Average Phase Current Estimation Method using a DC Link Shunt Resistor in the Three-Phase Inverter (3상 인버터에서의 직류단 단일 션트 저항을 이용한 평균 상전류 추정 방법)

  • Ku, Hyun-Keun;Yeom, Han-Beom;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.4
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    • pp.343-350
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    • 2016
  • Generally, the average phase current is sampled at the midpoint of a PWM signal for the vector control of an AC motor. The three-phase current can also be reconstructed from a DC-link shunt resistor by sampling the shunt voltage during the active vectors of the SVPWM. However, the reconstructed current is different from the average current because of the deviation of the sampling point from the midpoint of the PWM signal. This paper proposes an algorithm to estimate the average current from the reconstructed current in a single-shunt inverter. The proposed method is derived from the phase current slopes based on switching states and corresponding switching time. In addition, the proposed method is generalized for all the six sectors of the space vector hexagon. The validity of the proposed algorithm is verified with simulations and experiments.

Commutation Characteristic Analysis of DC Motor for Circuit Parameters (회로정수를 이용한 직류전동기의 정류 특성 해석)

  • Kim, Young-Sun;Lee, Joon-Ho;Lee, Ki-Sik
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.641-643
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    • 2000
  • Because of high torque and easiness of speed control, Direct Current(DC) motors are used long time. But, its applications are limited in circumstance and performance, since they contained brush and commutator. The commutation characteristic gives effect to life and performance of DC motor. Naturally, the commutation characteristic analysis is strongly required. In this paper, With the result of finite element analysis. The inductance is calculated each rotor position and applied to the voltage equations coupled with commutation equation. The time derivative term in the differential equation is solved in time difference method. This algorithm was applied to 2-pole shunt DC motor. We considered commutation characteristic by changing contact resistance between brush and commutator segment.

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Fault Diagnosis of Shunt Motor using Artificial Neural Network (인공 신경망을 이용한 분권 전동기의 고장 진단)

  • Lee, Kee-Sang;Choi, Nak-Won;Lim, Jea-Hyung;Lee, Jeong-Dong
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.21-23
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    • 1994
  • A Fault Detection. Isolation scheme based on ANN(Artifical Neural Network) is proposed for the supervision of a DC shunt motor. The Proposed FDI scheme can promptly detect the occurence of fault and classify all the faults that may occur during the operation. Also. it covers the full operating range in spite that the mathematical model of the motor contain strong nonlinearities. The simulation results show that the FDIU has good diagnostic ability even in the noisy environment.

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A New Waveshaper for Harmonic Mitigation in Vector Controlled Induction Motor Drives

  • Singh, Bhim;Garg, Vipin;Bhuvaneshwari, G.
    • Journal of Electrical Engineering and Technology
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    • v.3 no.2
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    • pp.152-161
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    • 2008
  • This paper deals with a new wave shaping technique for cost effective harmonic mitigation in ac-dc converter feeding Vector Controlled Induction Motor Drives(VCIMD's) for improving power quality at the point of common coupling(PCC). The proposed harmonic mitigator consists of a polygon connected autotransformer based twelve-pulse ac-dc converter and a small rating passive shunt filter tuned for $11^{th}$ harmonic frequency. This ac-dc converter eliminates the most dominant $5^{th},\;7^{th},\;and\;11^{th}$ harmonics and imposes the reduction of other higher order harmonics from the ac main current, thereby improving the power quality at ac mains. The design of autotransformer is carried out for the proposed ac-dc converter to make it suitable for retrofit applications, where presently a 6-pulse ac-dc converter is used. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed ac-dc converter in a wide operating range of the drive. Experimental results obtained on the developed laboratory prototype of the proposed harmonic mitigator are used to validate the model and design of the ac-dc converter.

A Combining PWM Control Method of High-speed Brushless DC Motor for Expansion of DC-link 1-Shunt Current Sensing Region (직류단 1-션트 전류 측정 영역 확장을 위한 고속 BLDC 전동기의 혼합 PWM 제어 방법)

  • Park, Gui-Yeol;Heo, Nam;Park, Hyung-Seok;Heo, Hong-Jun;Kim, Jang-Mok
    • Proceedings of the KIPE Conference
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    • 2018.07a
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    • pp.394-395
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    • 2018
  • 본 논문에서는, 직류단 1-션트 전류 측정을 이용하는 고속 BLDC 전동기 운전 시스템의 제어 성능 향상 및 전류 측정 영역 확장을 위한 제어 방법을 제안한다. 고속 BLDC 전동기의 PWM 기법과 그에 따른 직류단 1-션트 전류 측정 방법 및 측정 영역을 분석하고, 측정 가능 범위를 수식적으로 정리한다. 제안된 제어 방법은 전류 맥동 감소 및 고속 운전 정밀도 향상에 적합한 PWM 기법과 직류단 1-션트 전류 측정 범위가 넓은 PWM 기법을, 정리된 수식을 바탕으로 운전 영역에 따라 사용하여 제어 성능을 향상 시킨다. 계산 데이터 및 실험 결과를 통해 제안된 방법의 효용성을 확인한다.

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Development of Neuro-Fuzzy-Based Fault Diagnostic System for Closed-Loop Control system (페푸프 제어 시스템을 위한 퍼지-신경망 기방 고장 진단 시스템의 개발)

  • Kim, Seong-Ho;Lee, Seong-Ryong;Gang, Jeong-Gyu
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.6
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    • pp.494-501
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    • 2001
  • In this paper an ANFIS(Adativo Neuro-Fuzzy Inference System)- based fault detection and diagnosis for a closed loop control system is proposed. The proposed diagnostic system contains two ANFIS. One is run as a parallel model within the model in closed loop control(MCL) and the other is run as a series-parallel model within the process in closed loop(PCL) for the generation of relevant symptoms for fault diagnosis. These symptoms are further processed by another classification logic with simple rules and neural network for process and controller fault diagnosis. Experimental results for a DC shunt motor control system illustrate the effectiveness of the proposed diagnostic scheme.

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Analysis of Capacitor Voltage and Boost Vector in Neutral-Point-Clamped and H-Bridge Converter (NPC와 H-Bridge 컨버더의 부스트 벡터와 커패시터 전압의 해석)

  • 김정균;김태진;강대욱;현동석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.3
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    • pp.274-284
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    • 2003
  • Multi-level converter that is high-capacity electric power conversion system is used widely to electric motor drive system and FATCs(Flexible AC Transmission Systems). H-Bridge converter has been prevalently applied to shunt-type system because it can be easily expanded to the multi-level. In steady states, converter is normally operated in the range of 0.7∼0.8 of modulation Index. Even though zero vectors are not imposed to high modulation index, DC-Link voltage Is constant. It means that converter has another boost vector except for zero vectors among several vectors in 3-level converter. This paper has examined the principle of boost vector and investigated the difference between another boost vector and zero vectors in 3-level converter. In addition, this paper has analysed and compared the charging currents and the capacitor voltages of two topologies. The currents and voltages are related to reference voltage. Therefore, it proposed the calculation method for the voltage ripple and the charging current of each capacitor and compared various DC-Link voltage control methods through the simulation.

Input-Output Feedback Linearization of Sensorless IM Drives with Stator and Rotor Resistances Estimation

  • Hajian, Masood;Soltani, Jafar;Markadeh, Gholamreza Arab;Hosseinnia, Saeed
    • Journal of Power Electronics
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    • v.9 no.4
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    • pp.654-666
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    • 2009
  • Direct torque control (DTC) of induction machines (IM) is a well-known strategy of these drives control which has a fast dynamic and a good tracking response. In this paper a nonlinear DTC of speed sensorless IM drives is presented which is based on input-output feedback linearization control theory. The IM model includes iron losses using a speed dependent shunt resistance which is determined through some effective experiments. A stator flux vector is estimated through a simple integrator based on stator voltage equations in the stationary frame. A novel method is introduced for DC offset compensation which is a major problem of AC machines, especially at low speeds. Rotor speed is also determined using a rotor flux sliding-mode (SM) observer which is capable of rotor flux space vector and rotor speed simultaneous estimation. In addition, stator and rotor resistances are estimated using a simple but effective recursive least squares (RLS) method combined with the so-called SM observer. The proposed control idea is experimentally implemented in real time using a FPGA board synchronized with a personal computer (PC). Simulation and experimental results are presented to show the capability and validity of the proposed control method.