• Title/Summary/Keyword: Motor Point

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Comparison of weight and tractive effort of traction motor by choosing different rated operating point (견인전동기의 정격운전점 선정에 따른 전동기의 무게와 견인력 비교)

  • Park, Chang-Soon
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.361-363
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    • 1997
  • Rated frequency of inverter driven induction motor for a traction system can be chosen lower or higher. Traction motor with higher rated frequency can be lighter than the lower. But the maximum torque must be checked, because it is very important for starting and acceleration and it should be reduced with high frequency operation. In the paper, two motors with different rated frequency are designed and compared.

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A study on Vision based Steering Control for Dual Motor Drive AGV (영상시스템을 이용한 이륜속도차방식 AGV 조향제어)

  • Lee, Hyeon-Ho;Lee, Chang-Goo;Kim, Sung-Jong
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2277-2279
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    • 2001
  • This paper describes a vision-based steering control method for AGV which use dual motor drive. We suggest an algorithm which can be detect the guideline quickly and exactly for real time vision processing, and control the steering through an assign the CP (Control - Point) of input image. This method is tested via a IAGV which dual motor drive with a single camera in laboratory environment.

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Oral-Motor Facilitation Technique (OMFT): Part II-Conceptual Hierarchy and Key Point Technique (구강운동촉진기술: 2 부-개념적 위계 및 핵심 기법)

  • Min, Kyoung Chul;Seo, Sang Min;Woo, Hee-soon
    • Therapeutic Science for Rehabilitation
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    • v.10 no.1
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    • pp.53-61
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    • 2021
  • Introduction : OMFT is a therapeutic technique based on sensorimotor, motor control and motor learning, and its major goal is to improve oral motor function. The oral motor conceptual hierarchical development is divided into 5 steps: 1) sensorimotor, 2) movement integration, 3) structural movement, 4) functional oral motor, and 5) comprehensive oral motor. Discussion : The OMFT consists of 3 techniques, 10 categories, and 50 sub-item. 1) Warming up technique: 2 categories, 12 sub-item, warming up by sensory awareness and adaptation, therapy situation adaptation, neck movement; 2) Key point technique: 7 categories, 30 sub-item, oral motor facilitation and increasing chewing skill by direct stroke of oral structures such as the face, lips, cheeks, gum, jaws, and tongue; 3) Application technique: 1 category, 8 sub-item, facilitate food intake and swallowing. Conclusion : The goal of this article is to introduce 3 techniques, 50 sub-item of OMFT, as a comprehensive oral motor therapy method, for application to clients. This article provides information that will help oral motor specialists in treating clients with oral motor problems more effectively and professionally.

Sensorless Passivity Based Control of a DC Motor via a Solar Powered Sepic Converter-Full Bridge Combination

  • Linares-Flores, Jesus;Sira-Ramirez, Hebertt;Cuevas-Lopez, Edel F.;Contreras-Ordaz, Marco A.
    • Journal of Power Electronics
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    • v.11 no.5
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    • pp.743-750
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    • 2011
  • This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.

End point Control of a Flexible Beam Actuated by Moving Coil and DC Motor (가동코일 및 DC 모터로 작동되는 유연 빔의 끝점 제어)

  • Yoo, Hwa-jun;Nam, Yoon-su
    • Journal of Industrial Technology
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    • v.21 no.B
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    • pp.117-123
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    • 2001
  • In a modern control field, a control engineer who has theoretical backgrounds with some practical knowledge is demanded. That is to say, an engineer who can understand and operate the various parts such as modeling, simulation, system analysis, signal processing, statistics, and hardware is required. In order to prove the theoretical backgrounds and operate various hardwares, a lot of experimental devices for students are designed in universities. Since the conventional experimental devices are manufactured abroad and the prices of the devices are too high, it is difficult to have. If a low cost experimental device can be developed, it will be very useful for a control engineering education. In Ibis paper, an experimental rig which has two control inputs and three sensor outputs to control the end point of a flexible beam is designed and manufactured. This rig can be used for a control field education.

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Motor Learning Process of Halliwick 10 Point Program (Halliwick 10 Point Program의 운동학습과정)

  • Seo, Sam-Ki;Kim, Tae-Youl;Hwang, Tae-Yeun
    • The Journal of Korean Physical Therapy
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    • v.14 no.1
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    • pp.159-167
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    • 2002
  • The Halliwick concept was developed by James McMillan over 50 years ago, and began as a method for teaching swimming to children with physical disables. After that the Halliwcik concept was developed as a specific strategy(called the Ten-Point Program) for teaching swimming to children with disabilities. Soon after the changes in the physical and emotional behavior were attributed to a unique teaching/learning philosophy and a psycho-sensory-motor learning program that is enhanced by hydrodynamics. Recognizing the therapeutic effects of the Ten-Pont Program adapted the program as a therapeutic intervention called Water Specific Therapy or the Logic Approach to Therapy in Water.

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A study of control system on Permanent Magnet Linear Synchronous Motor with Z-axis operation structure (Z축 운전구조를 갖는 선형 영구자석형 동기 전동기 운전제어에 관한 연구)

  • Lee C.H.;Choi C.;Park H.W.;Kim C.U.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.654-658
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    • 2003
  • In this study a control system with variable gain schedule using real speed and moving direction is proposed to control a Permanent Magnet Linear Synchronous Motor (PMLSM) with Z-axis operation structure. The implementation of the controller is designed on the DSP TMS320C32 board. PMLSM is operated by using 4-point absolute positions profile with each velocity, acceleration and deceleration. The direction of the initial angle action for starting is set from the lower limit point to the upper limit point on PMLSM operation stroke. The effectiveness of a control system with variable gain schedule is demonstrated by some experimental results.

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Induction Motor Drive Using a Line Commutated Inverter with a Forced-Commutated Circuit (장제전류회로를 갖는 타려식 인버터를 이용한 유도적 성질)

  • 정연택;심재명
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.6
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    • pp.588-599
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    • 1992
  • This paper describes the variable speed drive of an induction motor by the line commutated inverter, which is operated in the forced commutation mode from start-up to operating point of load commutation. A novel forced-commutation circuit is proposed in this paper. The selection range of leading condenser to decide load commutation starting point is simulated by the sampling data of a general purpose IM and a high speed IM. The experiment to drive IM by a line commutated inverter with the proposed forced commutated circuits is performed. There was no problem in driving IM from standstill to starting point of load commutation by a line commutated inverter with forced commutation.

Precision Control X-Y Table Using Dual Modulus Technique

  • Choi, Gi-Sang;Unhavanich, SumaLee
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.82.6-82
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    • 2001
  • This paper presents the control X-Y table being the precise movement by point-to-point in the x-y plane. The dual modulus technique is used for our system to control the frequency of pulse supplied to the motors. Such technique is used to stop motor of both axes accurately as the desired target point in the same period. Both motors are stepping motor. To Improve steps per revolution, we employ ministep form to drive motors. In system, personal computer, using parallel port, is used for computing algorithm in open-loop form to control motors. In experiment, our system applies on the X-Y table for drawing to test system performance.

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Microcomputer-Based Maximum Efficiency Control of a Synchronous Motor. (마이크로 컴퓨터를 이용한 동기 전동기의 최대 효율제)

  • Hyun, Dong-Seok;Park, Min-Ho
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.36 no.12
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    • pp.874-887
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    • 1987
  • The efficiency of a synchronous motor can be substantially improved by controlling armature voltage, field excitation, and load angle on optimum values which yield minimum input power at any specified torque and speed. This improvement is particularly noticeable in the case of light loads. In addition, the control of armature input voltage improves the power factor at which the motor operates. Employed in the analysis is a new equivalent circuit model of the motor which incorporates the frequency dependent nature of the motor parameters and the effects of iron loss. The stability of synchronous motor operation is studied by applying the Nyquist stability criterion to the linearized equations which describe the behavior of the motor as the motor loads perturb about a steady-state operating point. This investigation reveals that, in some cases, the stable region of the motor is delineated from the results of a computer simulation. With a view to reducing harmonic loss and improving torque pulsation from harmonic components, a very poweful pulse amplitude modulation (PAM) method using an 16-bit microcomputer has been developed. This method has the advantages of simplicity of control algorithms and requires small memory space for storing thyristor trigger angles for a three-phase PAM inverter. The method can be used for smooth control of both modulation depth and frequency over a wide range.

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