• 제목/요약/키워드: Linear DC Motor

검색결과 157건 처리시간 0.021초

Brushless DC Motor Electromagnetic Torque Estimation with Single-Phase Current Sensing

  • Cham, Chin-Long;Samad, Zahurin Bin
    • Journal of Electrical Engineering and Technology
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    • 제9권3호
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    • pp.866-872
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    • 2014
  • The purpose of this paper was to find an effective method for measuring electromagnetic torque produced by a brushless DC motor with single-phase current sensing in real-time. A torque equation is derived from the theory of brushless DC motor. This equation is then validated experimentally with a motor dynamometer. A computer algorithm is also proposed to implement the electromagnetic torque estimation equation in real-time. Electromagnetic torque is a linear function of phase current. Estimating the electromagnetic torque in real-time using single-phase current is not appropriate with existing equations, however, because of the rectangular alternating-pulse nature of the excitation current. With some mathematical manipulation to the existing equations, the equation derived in this paper overcame this limitation. The equation developed is simple and so it is computationally efficient, and it takes only motor torque constant and single-phase current to evaluate the electromagnetic torque; no other parameters such as winding resistances, inductances are needed. The equation derived is limited to the three-phase brushless DC motor. It can, however, easily be extended to the multiphase brushless DC motor with the technique described in this paper.

파라미터 추정방법을 이용한 선형추진브러시리스 직류전동기의 속도-위치제어기 설계 (The Design of a Speed-position Controller using a Parameter Estimation Method for the Linear Brushless DC Motor)

  • 박성수;최중경;변지섭;윤성은;류정오
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
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    • pp.143-146
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    • 2001
  • Servomotors, especially linear brushless servomotors have numerous advantages over ball screws, timing belts, rack/pinion drives and friction drives compared wi th rotary servomotors This paper proposes an linear regression method as the estimated ion of unknown parameters from the linear brushless DC motor The estimated parameters are used to tune the gain of controller. In order to agree with this purpose, Digital Signal Processor (TMS320F240), developed for implementation of the motor control, is adopted in this study. The processor playing an important role in controller has A/D converters, PWM generators, riched I/O ports internally.

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TELM에 적용한 직병렬 공진형 DC/DC 컨버터의 출력전압 제어에 관한 연구 (A Study on the Output Voltage Control of Series-Parallel Resonant type DC/DC Converter for Transverse Flux Linear Motor)

  • 황계호;이영식;전진용;방덕제;김호종;신병철;강도현;김종무
    • 반도체디스플레이기술학회지
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    • 제4권1호
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    • pp.9-16
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    • 2005
  • In this paper, with loosely coupled transformer Relies-parallel resonant type DC/DC converter is analyzed and adopted to the power source of a TFLM(Transverse Flux Linear Motor). To get more efficient operating mode of the series-parallel resonant type DC/DC converter, theoretical analysis using normalized parameters are accepted. The analysis includes a specially made ferrite transformer with two separately wound half cores in order to evaluate analytically and experimentally the changes in magnetizing the leakage fluxes and inductances caused by the distance between the halves. The proposed converter must be operated in switching Pattern III among the three switching patterns for the Zero Voltage Switching operation. According to Pulse Frequency Modulation(PFM) control method, the output voltage of the proposed circuit can be controlled. The results of the theoretical development are compared with practical measurements from a prototype system.

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공심 코일형 리니어 DC 모터의 설계 및 동특성 해석 (Design and Dynamic Analysis of Air-core Coil type Linear DC Motor)

  • 강규홍;홍정표;김규탁;하근수;정중기;임태빈
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권3호
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    • pp.165-171
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    • 2000
  • This paper proposes a technique to design of air-core type Linear DC Motor(LDM) by using Equivalent Magnetizing Current(EMC) method and has performed its dynamic analysis. The magnetic flux density differ in accordance with airgap position due to difference of mechanical and magnetic air gap length and the coil shape has an influence on the thrust. Therefore, the analysis of magnetic field due to the magnets is carried out by EMC. The phenomena according to the various coil various coil shape under the same Magneto Motive Force(MMF) has been analyzed and its result is applied to the design process. The appropriateness of the proposed technique is confirmed by Finite Element Method(FEM) and its dynamic analysis is carried out from the coupling of the electrical circuit equation and mechanical kinetic equation.

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공진형 선형 액추에이터의 스프링 강성 변화에 따른 과도응답특성 (Transient Response Characteristic of a Linear Actuator in a Spring Stiffness Variations)

  • 강도현;홍도관;우병철
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제54권3호
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    • pp.134-138
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    • 2005
  • A typical conventional systems of a linear motion use rack and pinions or ball screws to convert rotary motions from DC servo motors. A linear motor has been used a several field for a MEMS technology and a aircraft carrier. We have studied a transient response of a linear actuator with a damping ratio, spring constant and a pressed power for a constant stroke control.

무철심형 리니어모터 개발 (Development of Coreless Linear Motor)

  • 정재한
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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    • pp.291-296
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    • 2000
  • Liner DC motors are widely used for servo-actuator, which would be applied for semiconductor equipments and precise machining systems. we have been developed linear DC motor with high speed, acceleration and position accuracy. From performance test, the position accuracy. From performance test, the position and repeatability accuracy were able to be controlled with 10 ${\mu}{\textrm}{m}$ and $\pm$1 ${\mu}{\textrm}{m}$, respectively. The highest acceleration and speed were obtained 3 G and 2m/sec, respectively. Static thrust force was 270N, and then error was 25%.

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외란 관측기를 이용한 리니어 BLDC 모터의 정밀위치제어 (Precise Positioning Control of Linear Brushless DC Motor using Disturbance Observer)

  • 고재원;이교범;구영모
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 D
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    • pp.2399-2401
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    • 2001
  • This Paper presents a positioning control method of the LBLDCM(Linear Brushless DC Motor) under friction. The friction may cause steady state position error. So it is necessary to consider friction effect for precision positioning control. The proposed control method uses disturbance observer algorithm and friction compensation. The experimental results of the proposed control method based on the disturbance observer are presented to show its effectiveness.

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디지털 시뮬레이션에 의한 CMAC 신경망 직류전동기 속도 제어기 설계 (Design for CMAC Neural Network Speed Controller of DC Motor by Digital Simulations)

  • 최광호;조용범
    • 전력전자학회논문지
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    • 제6권3호
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    • pp.273-281
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    • 2001
  • 본 논문에서는 비선형 시스템을 제어하기 위한 CMAC 신경망을 제안한다. CMAC 신경망은 사람의 소뇌를 모방한 신경망으로서 복잡한 비선형 함수의 해를 수치적인 연산에 의해 구하지 않고 table look-up방식을 이용하기 때문에 학습이 타 신경망에 비해 월등히 빠르고 용이하며 제어신호를 출력하기 위한 계산시간이 거의 필요치가 않다. 본 논문에서는 제안한 제어기 구조의 타당성을 증명하기 위해 간단한 비선형 함수와 직류전동기 속도제어에 대한 CMAC 제어기를 시뮬레이션을 통하여 학습 제어기의 안정성 및 추적에러의 감소를 확인하였다. 또한 제안 CMAC 제어기를 실시간 장력제어에 적용하여 직류전동기의 속도를 제어하므로 시뮬레이션 값과 비슷한 장력제어를 보인으로서 유용성을 입증하였다.

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DC Motor와 Ballscrew를 이용한 Electromagnetic Damper Damping 효과 실험 (A Experiment of the damping effect for Electromagnetic Damper using DC Motor and Ballscrew)

  • 강정호;이학철;정영석
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2008년도 하계학술대회 논문집
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    • pp.124-126
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    • 2008
  • In this Paper, the modeling of the electromagnetic damper for automobile suspension is presented and the validation of the model is demonstrated by experiments. An electromagnetic damper, composed of a rotary DC motor, and a ball screw and nut. The damper then operates as a linear electric actuator. The damper then operate as a linear electric actuator. The results indicate the proposed system is feasible and it is proved that the electromagnetic damper has better than oil damper of passive control system.

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브러시리스 DC 선형 모터에서 역기전력 측정을 통한 추력 특성 분석 (The analysis of the thrust characteristics by a measurement of the back-EMF in a brushless DC linear motor)

  • 이춘호;최문석;이상락;김용일;현동석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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    • pp.10-12
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    • 1997
  • For a given brushless DC linear motor, we analyze the thrust characteristics. We measure the back-EMF and then calculate the thrust with it. To compare the thrust, we measure it direct with force-torque meter and we calculate it from Lorentz equation. As the thrust and the back-EMF vary linearly according to the current and the velocity respectively, we define the thrust constant and the back-EMF constant. To match the motor to its controller, we calculate the thrust constant and the back-EMF constant. The result calculated with the back-EMF differs from that of the measurement by only 4.4%.

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