• Title/Summary/Keyword: General Motors

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Border Effect of Transmission Coverage in Mobile Wireless Communications

  • Haughs, J. David;Kim, Dong-Soo S.
    • Journal of Ubiquitous Convergence Technology
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    • v.2 no.2
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    • pp.97-104
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    • 2008
  • In this paper, we demonstrate the boundary effect of a deployed regions on the effective coverage of a mobile node. A node coverage area is not uniform throughout the entire deployed region. Assuming a uniform coverage can result in significant error in calculations. In this study, we analyze the behavior of a node's coverage area as a function of its transmission range throughout the entire deployed region. Using this analysis, a mathematical model for effective coverage in mobile wireless communications is created. The mathematical model considers the effect of the deployed regions boundaries on the coverage area of a mobile node. Lastly, we present simulation results to verify the analytical model and to compare this model with that of a uniform coverage.

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Design of linear synchronous motor with slotted structure (치-슬롯을 갖는 직선형 동기 전동기의 설계 특성)

  • Jang, Seok-Myeong;You, Dae-Joon;Choi, Jang-Young;Park, Ji-Hoon
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.197-199
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    • 2006
  • This paper presents a analytical field solutions for the general class of Linear Brushless DC(LBLDC) motors with PM mover and 3-phase winding stator. In our magnetic field analysis, we have adopted an approach which can treat both magnetized material and winding from the each field analysis by magnetic vector potential considering 2-Dimensional slot modeling. Therefore, we give accurate analytical formulas and object function for design and parameters estimation by its magnetic field.

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Torque ripple control of High Current SRM using Fuzzy Controller (퍼지제어기를 이용한 대전류 SRM의 토크리플제어)

  • OH, Dong-Jun;Huh, Uk-Youl
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.373-375
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    • 2004
  • The SRM is more robust and lower cost than other type motors. The inverter for SRM cannot have shoot through fault, since a phase winding of SRM is independent of other phase windings. The SRM has high starting torque and high power density. But it has torque ripples due to nonlinear magnetic characteristics. Therefore, SRM has highly non-linear torque producing characteristics. Because fuzzy logic is a flexible and general-purposed method for implementing non-linear dynamic functions, it is effective for the control of high current SRM. We design the fuzzy controller and demonstrate the fuzzy control system by MATLAB.

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Instantaneous Power Control of Permanent Magnet AC Motor (영구자석형 교류전동기의 순시전력제한)

  • Youn, K.S.;Lee, C.H.;Hwang, J.H.;Kwon, W.H.
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.274-277
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    • 1996
  • Vector controlled PMAC(Permanent Magnet AC) motor, with rare-earth permanent magnet, are suitable for servo system demanding fast speed response. However, abrupt acceleration and deceleration control for fast response requires big instantaneous input power. So general PI control of PMAC motors can't be applied for limited power supply system like airplane or portable equipment because of input power fluctuation. Proposed technique to restrain instantaneous input power use variable power limit depends on airgap flux power. Stability check for proposed system is done.

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Simulation of Vehicle Steering Control through Differential Braking (차동 제동을 이용한 조향 제어 시뮬레이션)

  • 제롬살랑선네;윤여흥;장봉춘;이성철
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.65-74
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    • 2002
  • This paper examines the usefulness of a Brake Steer System (BSS), which uses differential brake forces for steering intervention in the context of Intelligent Transportation Systems (ITS). In order to help the car to turn, a yaw moment can be achieved by altering the left/right and front/rear brake distribution. This resulting yaw moment on the vehicle affects lateral position thereby providing a limited steering function. The steering function achieved through BSS can then be used to control lateral position in an unintended road departure system. A 8-DOF nonlinear vehicle model including STI tire model will be validated using the equations of motion of the vehicle. Then a controller will be developed. This controller, which will be a PID controller tuned by Ziegler-Nichols, will be designed to explore BSS feasibility by modifying the brake distribution through the control of the yaw rate of the vehicle.

Stability Analysis of Induction Motor Rotor by Unbalanced Electromagnetic Forces (불평형 전자기력에 의한 유도전동기 회전자의 안정성해석)

  • 양보석;손병구
    • Journal of KSNVE
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    • v.8 no.6
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    • pp.1086-1092
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    • 1998
  • This paper presents a general analytical method for analyzing the instability of unbalanced electromagnetic forces produced in induction motors with an eccentric rotor. The equations to be solved are a set of second order differential equations which give matrices with periodic coefficients that are a function of time due to the unbalanced electromagnetic force. The method is based on an extension of the Floquet theory. A transfer matrix over one period of the motion is obtained. and the stability of the system can be determined with the eigenvalues of the matrix. The analysis results of instability zone were coincided upon comparing that of transfer matrix method with that of rotating frame. Two examples are given. including an industrial application. The results show that the method proposed is satisfactory.

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Agent-based Shipment Algorithm for Capacitated Vehicle Routing Problem with Load Balancing (CVRP를 위한 에이전트 기반 Shipment 알고리듬 개발)

  • Oh, Seog-Chan;Yee, Shang-Tae;Kim, Taioun
    • Journal of Korean Institute of Industrial Engineers
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    • v.32 no.3
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    • pp.200-209
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    • 2006
  • Load building is an important step to make the delivery supply chain efficient. We present a family of load makeup algorithms using market based control strategy, named LoadMarket, in order to build efficient loads where each load consists of a certain number of finished products having destinations. LoadMarket adopts Clark-Wright algorithm for generating initial endowment for Load Traders who cooperate to minimize either total travel distance or the variance with respect to the travel distances of loads by means of the spot market or double-sided auction market mechanism. The efficiency of the LoadMarket algorithms is illustrated using simulation based experiments.

Characteristic Analysis of Iron-cored PM Linear Motor in Three Types Synchronous Motor in Three Types (세가지 형태의 영구자석 배열에 따른 직선형 동기 전동기의 특성해석)

  • Jang, Seok-Myeong;You, Dae-Joon;Lee, Sung-Ho
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.116-118
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    • 2003
  • The Slotless Permanet-magnet linear synchronous motors (PMLSM) have been developed for factory automation, transportation applications, wafer steppers, conveyance system, and so on[1]. The current analysis and design are treated in air-cored PMLSM. The main purpose of this paper is to provide a general design and analysis framework for the iron-cored linear permanent-magnet machines. Based on field solution using two dimensional analytical technique the magnetic field required magnet volume size, optimal winding thickness size, winding flux linkage and thrust will be discussed.

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A Simple Method for Identifying Mechanical Parameters Based on Integral Calculation

  • Han, Sang-Heon;Yoo, Anno;Yoon, Sang Won;Yoon, Young-Doo
    • Journal of Power Electronics
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    • v.16 no.4
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    • pp.1387-1395
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    • 2016
  • A method for the identification of mechanical parameters based on integral calculation is presented. Both the moment of inertia and the friction constant are identified by the method developed here, which is based on well-known mechanical differential equations. The mechanical system under test is excited according to a pre-determined low-frequency sinusoidal motion, minimizing the distortion, and increasing the accuracy of the results. The parameters are identified using integral calculation, increasing the robustness of the results against measurement noise. Experimental data are supported by simulation, confirming the effectiveness of the proposed technique. The performance improvements shown here are of use in the design of speed and position controllers and observers. Owing to its simplicity, this method can be readily applied to commercial inverter products.

Digital Control System for Induction Motor Drive Using DSP (DSP를 이용한 유도전동기 디지털 제어시스템)

  • Kim, Min-Huei;Kim, Nam-Hun
    • Journal of the Korean Society of Industry Convergence
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    • v.3 no.1
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    • pp.9-15
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    • 2000
  • This paper presents a implementation of digital motion control system for induction motor vector drives using the 16bit DSP TMS320F240. The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent controllers for motors which can be yield enhanced operation, fewer system components, lower system cost, increased efficiency and high performance. The system presented are speed and current sensing, sine look-up table and generated SVPWM by fully integrated control software. The developed system in a implementation are shown a good speed response and motion control characteristic results, and high performance features in general purposed 2.2[kW] machine. The system can be adapted variform motor drive system.

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