• Title/Summary/Keyword: AC machine

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Structure Design and Implementation of AC Servo Motor Control Program (AC 서보모터 제어 프로그램 구조 설계 및 구현)

  • Kyungah Kim;Joon-Young Choi
    • IEMEK Journal of Embedded Systems and Applications
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    • v.18 no.5
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    • pp.209-215
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    • 2023
  • This study proposes an AC servo motor control program structure and its implementation method to efficiently integrate 13 types of additional compensation algorithms into the basic FOC (field-oriented control) algorithm program. Various compensation algorithms are necessary to enhance the stability and performance of machine tools by compensating for interference from disturbances and vibrations. Each compensation algorithm is implemented as a separate, independent function and called from a switch-case statement in the ISR (interrupt service routine) of the PWM (pulse-width modulation) device. The advantages of this approach include facilitating not only debugging and testing but also reducing the possibility of errors during the program development phase. Thus, it is easy to add and activate each specific compensation algorithm for the program update during the program operation phase. The implemented motor control program was experimented with a single-axis feed shaft testbed driven by a commercial AC servo motor control drive board and a 750 Watts SPMSM (surface-mounted permanent magnet synchronous motor), and the results verified its normal operation and performance improvement.

Characteristics of AC Treeing for Three Epoxy Resins for High Voltage Heavy Electric Machine Appliances (고전압 중전기기용 에폭시 수지 3종에 대한 교류트리잉 파괴특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.10
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    • pp.1322-1329
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    • 2018
  • In this paper, the reliability test of three kinds of epoxy resin for GIS Spacer, which is a high voltage based heavy electric machine, AC electrical treeing experiments were performed. Three types of epoxy resins, Araldite B41, CT 5531 CI and B46, have slight viscosity differences. An non-uniform electric field, E = 1149.4 kV/mm, as the needle to plate electrode, a power source with a frequency of 1 kHz was applied to the tree electrode for accelerated deterioration. The treeing phenomena of the three kinds of epoxy resin all initiated, propagated, and destroyed by the branch tree. Epoxy Resin B46 was 145 times longer than B41 and 53 times longer than CT 5531CI. I think that the choice of epoxy resin is very important in choosing high voltage heavy electric machine insulation materials.

AC Servo Motor Position and Speed Control Characteristics of CNC Machine Tools (CNC 공작기계의 AC 서보 모터의 위치 및 속도 제어 특성)

  • 박인준;백형래;정헌상;정수복;최송철
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.352-356
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    • 1998
  • This paper is a study about Ac servo motor position and speed control characteristics which depend on feedforward control, the acceleration / deceleration time constant after the interpolation, and PI control, automatic deceleration at corner in order to shape cutting control of feed drive system of the machine tool. The shape error caused by delay of the servo system in the direction of radius at the time of circular cutting is reduced by feedforward control. The shape error generated by the position command delay is minimized by using the acceleration / deceleration time constant after the interpolation. The results were verified to optical machining center experimentation of the machine tool.

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Performance of Double Fed Induction Machine at Sub- and Super-Synchronous Speed in Wind Energy Conversion System

  • Eskander, Mona N.;Saleh, Mahmoud A.;El-Hagry, Mohsen M.T.
    • Journal of Power Electronics
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    • v.9 no.4
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    • pp.575-581
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    • 2009
  • In this paper two modes of operating a wound rotor induction machine as a generator at sub-and super-synchronous speeds in wind energy conversion systems are investigated. In the first mode, known as double fed induction generator (DFIG), the rotor circuit is fed from the ac mains via a controlled rectifier and a forced commutated inverter. Adjusting the applied rotor voltage magnitude and phase leads to machine operation as a generator at sub-synchronous speeds. In the second mode, the machine is operated in a slip recovery scheme where the slip energy is fed back to the ac mains via a rectifier and line commutated inverter. This mode is described as double output induction generator (DOIG) leading to increase the efficiency of the wind-to electrical energy conversion system. Simulated results of both modes are presented. Experimental verification of the simulated results are presented for the DOIG mode of operation, showing larger amount of power captured and better power factor when compared to conventional induction generators.

A Study on the Control of AC Servo Motor for Machine Tools Cartesian Coordinate Type Using Neural Network (신경회로망을 이용한 평면좌표형 공작기계 교류서보전동기의 제어에 관한 연구)

  • 김평호;백형래;정수복
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.1
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    • pp.49-56
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    • 2001
  • This paper presents a new approach to the problem based on neural network methods. Instead of using general controllers, neural networks PID control are used to control AC servo motor. The most popular and widely used control method in servo system control loops is PID type. PID controller has the features of simple structure, stability and reliability. But it has limitations in complex system control and can not remain above virtues under the conditions of parameters uncertain and environment uncertainties. AC servo motor controller is designed for drive of the cartesian coordinate type for machine tools.

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A study on the improvement of floating point operation for AC servo motor controller based on fixed point DSP (고정소수연산 DSP 기반 AC 서보모터 제어기의 소수연산 개선에 관한 연구)

  • Hwang, In-Sung;Hong, Sun-Ki
    • Proceedings of the KIEE Conference
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    • 2004.10a
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    • pp.43-45
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    • 2004
  • This paper represents the improvement of floating point operation for AC servo motor controller based on fixed point operation DSP. TMS320F2812 has fixed point operation processing structure. The controller parameters are modified to the digitized data by scaling the original parameters. TMS320F 2812 is a 32-bit processor, and it could have enough accuracy to get the digitized data this procedure is implemented and the experiments controling a AC servo system.

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A study on the adaptive control of process parameters using torque for end milling operation in machining center (Machining Center에서 End Millirh할 때 Torgue에 의한 가공변수의 적응제어에 관한 연구)

  • 박천령;윤문철
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.6
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    • pp.889-897
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    • 1986
  • The purpose of this study is to describe the strategy of machining process suitable for developing adaptive control with constraint of NC-machine tool. The algorithm that controls machining process parameters of every sampling time is established for the constraint of torque in machinig center. To prove this AC algorithm, manual AC-unit control test is used for simulating the on-line AC strategy control. Also machining tests are carried out on a CNC-machining center fitted with the ACC system and compared with the simulated results. The practical effectiveness of the ACC systems so discussed and the reduction of machining time are demonstrated with reference to typical models of cutting workpieces. As a typical model, taper and step geometry model are selected. The computer simulation results have a good agreement with the experimental observation and make it possible to develope a NC-machine tool with an on-line ACC system.

Steady State and Transient Analysis of Switched Reluctance Motor Drive Fed from a Controlled AC-DC Rectifier

  • Moussa, Mona Fouad
    • Journal of Electrical Engineering and Technology
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    • v.12 no.4
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    • pp.1495-1502
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    • 2017
  • The Theory of operation of switched reluctance motors (SRM) depends on the reluctance torque, where energy is transferred to stator winding only. Although its construction is simple, the electrical design is complex, due to the switching configuration needed to deliver power to stator coils. However, because of the nonlinearly of magnetic circuit, SRM has torque ripple. This paper proposes a new strategy to drive SRM from a single-phase AC supply. Each stator winding is connected to AC-DC or AC-AC converters, which is called branch. All branches are connected in parallel to a single-phase AC supply. A shaft encoder allows current production in stator winding during the positive torque production region and terminates it during the negative torque production region. A magnetic flux is produced between stator poles when current is supplied from AC supply to stator coil and repeats many cycles as long as the rate of change of stator inductance is positive. Different possibilities for the configurations of AC-AC or AC-DC converters are introduced to drive SRM from the single-phase AC supply. A case study is presented for a SRM fed from AC supply through semi-controlled AC-DC converter is presented. A simulation model is introduced and verified by experimental rig for two-phase SRM.