• Title/Summary/Keyword: AC motor

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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.

A Novel Method to Suppress Mid-Frequency Vibrations with a High Speed-Loop Gain for PMSM Control

  • Li, Qiong;Xu, Qiang;Huang, Shenghua
    • Journal of Power Electronics
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    • v.16 no.3
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    • pp.1076-1086
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    • 2016
  • PI controllers are one of the most widely used controllers in industrial control systems due to their simple algorithms and stability. The parameters Kp and Ki determine the performance of the system response. The response is expected to improve by increasing the gain of the PI controller. However, too large a gain will accelerate the speed response and cause vibrations, which is not what is expected. This paper proposes a way to suppress vibrations by detecting the vibration frequency and extracting the vibration signal as a compensation to the speed feedback. Additionally, in order to improve its disturbance rejection ability, a low-order disturbance observer is proposed. This paper also explains the operation principle of the proposed method by analyzing the transfer function and it describes the design of the controller parameters in detail. Simulation and experimental results are provided to verify the merits of the proposed method. These results also show the good performance of the proposed method. It has a rapid response and suppresses vibrations.

Analysis and Modeling of Fishing Boat's Power Network for using Renewable Energy Source (신재생 에너지원 활용을 위한 어선 전력계통 분석 및 모델링)

  • Lee, Sang-Jung;Lee, Dong-Gil;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.2
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    • pp.182-189
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    • 2016
  • A modeling method of electric power network inside a fishing boat less than 5 tons is proposed for its high-energy efficiency with renewable energy sources. The power network inside the fishing boat consists of a diesel engine, a starter motor, an alternator, battery packs, and electric loads, which are connected in parallel. To obtain proper power network model, the voltage -current characteristics of the electric components are considered to develop elaborate electrical models under several load conditions. Measured data of the battery and alternator current include noise. By using an average method, the AC components from the power network of the fishing boat can be reduced, which is verified by KCL rule. Using the proposed power network model, the power generation of the alternator and the reduction of diesel consumption in the boat's engine are predictable under various operating conditions. The validity of the proposed methodology is verified by comparing simulation results with experimental measurements using statistical inferences.

A Study on Structural Analysis of Integrated Machining Center (집적화된 Machining Center의 구조해석에 관한 연구)

  • Park, Seong-Jin;Lee, Choon-Man;Kim, Woong;Byun, Sam-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.1
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    • pp.49-54
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    • 2010
  • An integrated machining center is developed for high precision and productivity manufacturing. The developed machine is composed of the high precision spindle using ball bearings, the high stiffness bed and the three axis CNC controller with the high resolution AC servo motor. In this paper, structural and modal analysis for the developed machine are carried out to check the design criteria of machine. The analysis is carried out by FEM simulation with using the commercial software, CATIA V5, ANSYS and ARMD. The simulation model of machine is made by shell and solid finite elements. This study also presents the measurement system on the modal analysis of an integrated machining center. The weak part of the machine is found by the analytical evaluation. The results provide with the structural modification data for good dynamic behaviors. And the safety of machine is confirmed by the modal analysis of modified machine design. As this study results can be trustworthy with the analysis of ANSYS and CATIA, integrated machining center can be successfully developed.

Analsis of Preponderant Wear of Earth Brush for an Electrical Multiple Units(EMUs) (전동차용 접지브러쉬 편중마모에 대한 해석)

  • Park, Byung-Sup;Ku, Jung-Su;Kim, Gil-Dong
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.356-361
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    • 2005
  • Earth brush for electrical multiple units(EMUs) is a device through which the current of the EMU load's consumed power fed from the DC 1,500V overhead line (or from the AC 25.000V catenary) flows via axle to the rail(ground) and which prevents the electric corrosion of the axle bearings by preventing the current flow to the axle bearings caused by electric potential from the magnetic field when the bearings rotate together with the earthing function when a thunderbolt falls or a surge comes. The earth brush wear rates among cars, however, shows quite differences when the earth brushes after being separated from the holders are measured with vernier callipers every 6 months of maintenance period. Main causes of the earth brush wear are divided as mechanical, electric arc and electrical one, and the factors can be running speed, current, harmonics, connection state. spring tension, earth brush material, lubricant and so on. but only the earth brushes of the motor(M1) car show the highest wear rate and moreover maintenance difficulty occurs because of the wear rate differences among e earth brushes in one holder. The reason for these preponderant wear comes from the design concept of making preponderant current flow to some particular earth brushes and moreover the heat generated by the harmonics when the inverter starts to operate accelerate the wear. By defining these causes through experiments. I hope that the found results would be helpful for the future EMU design, safety, economy and maintenance.

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Magnetic Properties of Sintered Fe Cores Containing Stainless Steel-making Dusts (스테인레스 제강 분진을 함유한 순철 소결코아의 자기특성)

  • 김상원
    • Journal of the Korean Magnetics Society
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    • v.11 no.3
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    • pp.114-121
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    • 2001
  • Effect of sintering temperature and dusts content on sintered density ($\rho$) and magnetic properties were evaluated. Cores sintered at 1350 $^{\circ}C$ for 1 hour with the Fe powders containing up to 10 wt.% dusts showed a good AC/DC properties. For example, the DC magnetic properties of magnetic induction (B$_{15}$), coercive force (H$_{c}$) and permeability ($\mu$$_{max}$) of cores containing 10 wt.% dusts were ranging over 9.8~ 10.9 kG, 2.2-2.3 Oe and 1950~2050, respectively. These magnetic properties are equivalent to those of competitor's (i.e, Ancorsteel produced by Hoganas). The cores obtained from the present work are expected to apply for high-performance soft magnetic components such as automotive and DC motor.

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Simple Al Robust Digital Position Control of PMSM using Neural Network Compensator (신경망 보상기를 이용한 PMSM의 간단한 지능형 강인 위치 제어)

  • Ko, Jong-Sun;Youn, Sung-Koo;Lee, Tae-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.8
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    • pp.557-564
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    • 2000
  • A very simple control approach using neural network for the robust position control of a Permanent Magnet Synchronous Motor(PMSM) is presented. The linear quadratic controller plus feedforward neural network is employed to obtain the robust PMSM system approximately linearized using field-orientation method for an AC servo. The neural network is trained in on-line phases and this neural network is composed by a feedforward recall and error back-propagation training. Since the total number of nodes are only eight, this system can be easily realized by the general microprocessor. During the normal operation, the input-output response is sampled and the weighting value is trained multi-times by error back-propagation method at each sample period to accommodate the possible variations in the parameters or load torque. In addition, the robustness is also obtained without affecting overall system response. This method is realized by a floating-point Digital Signal Processor DS1102 Board (TMS320C31).

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Design and Fabrication of an Ultra-low Partial Discharge Measurement System (극미소 부분방전 측정시스템의 설계 및 제작)

  • Seo, Hwang-Dong;Song, Jae-Yong;Moon, Seung-Bo;Kil, Gyung-Suk;Kwon, Jang-Woo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.208-211
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    • 2005
  • This paper presents an ultra-low partial discharge(PD) measurement system that has been accepted as a non-destructive method to estimate electrical insulation of low-voltage electric devices. The PD measurement system is composed of a coupling network, a low noise amplifier, and associated electronics. A shielding box is used to make a better condition against electromagnetic interference. A low cut-off frequency of the coupling network was 1MHz(-3 dB). Calibration tests on laboratory set-up have shown that the PD measurement system has a stable sensitivity of 11.4mV/pC. In an application experiment on a low-voltage induction motor(5HP), we could detect 0.77pC level of partial discharge pulse at the applied voltage of AC 664 V$_{peak}$.

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SRM Drive System Using 6-switch IGBT Module (6-Switch IGBT Module을 이용한 SRM 구동 시스템)

  • Kim Yuen-Chung;Yoon Yong-Ho;Lee Won Cheol;Lee Byoung-Kuk;Won Chung-Yuen
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.6
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    • pp.569-577
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    • 2005
  • In this paper, a new control scheme to use 6-switch IGBI module for 3-phase switched reluctance motors(SRM) is proposed. Compared with the conventional asymmetric bridge converter topology, it can minimize the entire system size and cost. Therefore, it may have a new topology lot SRM to compare the other ac motors, such as induction motors, brushless dc motors, and so on. The validity of the proposed method is verified by simulation, and experimental results.

Transient Performance of a Hybrid Electric Vehicle with Multiple Input DC-DC Converter

  • Nashed, Maged N.F.
    • Journal of Power Electronics
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    • v.3 no.4
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    • pp.230-238
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    • 2003
  • Electric vehicles (EV) demands for greater acceleration, performance and vehicle range in pure electric vehicles plus mandated requirements to further reduce emissions in hybrid electric vehicles (HEV) increase the appeal for combined on-board energy storage systems and generators. And the power electronics plays an important role in providing an interface between fuel cells (FC) and loads. This paper deals with a multiple input DC-DC power converter devoted to combine the power flowing of multi-source on energy systems. The multi-source is composed of (i) FC system as a prime power demands, (ii) super capacitor banks as energy storage devices for high and intense power demands, (iii) superconducting magnetic energy storage system (SMES), (iv) multiple input DC-DC power converter and (v) a three phase inverter-fed permanent magnet synchronous motor as a drive. In this system, It is used super capacitor banks and superconducting magnetic energy replaces from the battery system. The modeling and transient performance simulation is effective for reducing transient influence caused by sudden charge of effective load. The main purpose of power electronic converters is to convert the DC power output from the fuel cell and other to a suitable AC voltage, which can be connected to electric loads directly (PMSM). The fuel cell and other output is connected to the DC-DC converter, which regulates the DC link voltage.