• 제목/요약/키워드: Motor point

검색결과 775건 처리시간 0.019초

소형 BLDCM 드라이브의 최적 전류제어에 관한 연구 (A Study on Optimal Current Control Method for Small BLDC Motor Drive)

  • 박창석;정태욱
    • 조명전기설비학회논문지
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    • 제29권4호
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    • pp.108-115
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    • 2015
  • This paper proposed a optimal current control method to improve efficiency of BLDC motors. The aim of the proposed method is to use the maximum torque operating method by increasing the effective voltage at the maximum torque point unlike existing SPM operating method. The proposed method is based on existing IPM maximum torque operating method grafting onto a square wave operating of SPM motors. As the method of increasing the effective output voltage from inverter using the maximum torque point, the proposed method is to improve efficiency of BLDC motors using the same amount of the existing current effectively. For this method, the maximum torque point is carried out by FEA and analysis of magnetic flux vector. In this paper, the prototype of general-purpose BLDC drive is manufactured and the performance characteristic and validity are verified.

중형승용차 운전 중 발거동 분석 (Analysis About How Human Foot Move During Driving Condition)

  • 박보현;정희석;이승환
    • 대한산업공학회지
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    • 제38권1호
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    • pp.41-45
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    • 2012
  • Until now, most studies of foot moving or driving posture have been performed under laboratory driving conditions. But there are many different things between actual driving conditions and laboratory driving conditions because, in laboratory conditions, it is hard to consider vehicle's noise, vibration and people's psychology state while driving. Thus this study is performed through actual driving conditions. And while driving test, we recorded driver's foots with 2 cameras to investigate foots(left and right) heel point and how human foots move to control the three pedals : accel, brake and footrest.. Through driving test, the results of this study show that the position of driver's heel point isn't related to stature and tends to be generalized.

BLDC 모터에서 전류시간이 토크맥동에 미치는 영향에 관한 연구 (A Study on the Influence of Commutation Time on Torque Pulsating in BLDCM)

  • 김철주;강병희;목형수;최규하
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제50권1호
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    • pp.23-29
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    • 2001
  • A BLDC motor has a serious drawback that torque pulsation is generated in every commutation period though it has many advatages compared to the conventional DC Motor. In this paper, the influence of commutation time on torque pulsation is studied. Generally in calculating the torque of BLDC motor, it is assumed that the decaying phase back EMF is constant, but the torque model considering decaying phase back EMF is introduced here. Through it, the torque in commutation period has torque pulsation component caused by commutation itself and it cannot be removed perfectly even if there is no current pulsation. To reduce the torque pulsation, a new method is proposed, which controls a point of commutation and the optimal point of commutation is found. Simulation shows that proposed method reduces the torque pulsation considerately.

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SMD Mounter용 선형 영구자석 동기기의 고정밀 위치제어 (High Resolution Position Control of Linear Permanent Magnet Synchronous Motor for SMD Placement System)

  • 김장환;설승기;전정렬;최연규
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.314-316
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    • 2001
  • This paper present the position control method for the application of permanent magnet linear synchronous motor. Controller is designed as a conventional P-PI controller, but the extra information is used such as velocity and acceleration from motion profiles. The profiles comes from S-Curve which is an optimized point-to-point motion profiles to achieve fast motions with minimum vibration[2]. In this application, the targets of the position control are maximum 10um position error within 10msec after respective ending point of position profiles. The implementation of the controller has been done in full digital way. All the controller is designed on the DSP TMS320VC33 control board. To prove performance of the controller, the experiment was performed with a servo linear motor.

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한국교통대학교 Solar Car 구동 시스템 분석 및 설계 (The Analysis and Design of the Driving System for the Solar Car)

  • 김일송
    • 예술인문사회 융합 멀티미디어 논문지
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    • 제9권5호
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    • pp.865-872
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    • 2019
  • 본 논문은 한국교통대학교 태양광 자작 자동차 동아리 늘해랑에서 WSC(World Solar Challenge)에 참가하기 위해 제작한 Solar Car 구동시스템에 대하여 서술한다. WSC는 세계 최대의 태양광 자동차 경주 대회로 별도의 자동차 규정을 가지고 있어 태양전지 면적이나 배터리 용량등에 제약을 두기 때문에, 제한된 규정내에서 최대 에너지 효율을 가지도록 구동시스템을 설계하는 것이 가장 중요한 기술적인 팩터이다. Solar car의 구동시스템은 태양광 에너지를 전기 에너지로 변환해주기 위한 solar array, 변환된 전기에너지를 최대 출력으로 추적하기 위한 MPPT(Maximum Power Point Tracker) controller, 생산된 전기에너지를 저장하기 위한 battery, 전기에너지를 역학에너지로 변환하여 차량 구동을 위한 BLDC(Brushless DC) motor, BLDC motor를 제어하기 위한 motor controller 등으로 구성되어 있다. 본 연구에서는 최적 구동 시스템을 위해 태양전지 에너지 변환 시스템과 배터리, 모터로 구성된 전기 구동시스템 설계에 대한 내용을 포함하고 있다.

Underlying Control Strategy of Human Leg Posture and Movement

  • Park, Shinsuk
    • Journal of Mechanical Science and Technology
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    • 제18권4호
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    • pp.649-663
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    • 2004
  • While a great number of studies on human motor control have provided a wide variety of viewpoints concerning the strategy of the central nervous system (CNS) in controlling limb movement, none were able to reveal the exact methods how the movement command from CNS is mapped onto the neuromuscular activity. As a preliminary study of human-machine interface design, the characteristics of human leg motion and its underlying motor control scheme are studied through experiments and simulations in this paper. The findings in this study suggest a simple open-loop motor control scheme in leg motion. As a possible candidate, an equilibrium point control model appears consistent in recreating the experimental data in numerical simulations. Based on the general leg motion analysis, the braking motion by the driver's leg is modeled.

3상 인버터 구동 유도전동기의 회전자 1 슬롯 최적설계에 관한 실험 (Experimental Test for the Optimum Design of a Rotor Slot in Three Phase Inverter-fed Induction Motor)

  • 김재우;권병일;김병택;조용
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.131-134
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    • 2002
  • The optimum design technology using combind F.E.M and eauivalent circuit is so fast and accurate that it can be applied to the optimum rotor design of an inverter-fed induction motor in high efficiency motor making industry. The optimum characteristics fer a rotor slot model of a 3 phase inverter-134 nduction motor was previously verified by a time-step F.E.M. In this paper, four verification models with the design variables near the optimum point are designed to chech whether the characteristics of a slot model presented is not less than those of the near models. The outputs of whole models are analyzed in a time-step Finite Element Method and compared in the experimental test. The economical and efficient selecting method of design variables fur the computer simulation and experimental test is presented in order to assure the optimum point.

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회전자 슬립이 wobble 모터의 기어비에 미치는 영향 (Effect of rotor slip on the gear ratio of wobble motor)

  • 윤서진;이은웅;우성봉
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 A
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    • pp.339-341
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    • 1999
  • This paper presents the gear ratio of wobble motor, accounting for finite friction in contact point. The gear ratio of a wobble motor is affected by rotor slip, which is a function of motive torque, excitation angle, and friction torque. The gear ratio of a wobble motor can be expressed as a constant term plus a term that accounts for rotor slip. The ideal gear ratio is constant term and is equal to the rotor radius divided by the distance between the center of the rotor and the center of the stator. The rotor-slip term is shown to be directly proportional to the contact point friction torque and inversely proportional to the square of the excitation voltage.

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Nanometric Positioning Over a One-Millimeter Stroke Using a Flexure Guide and Electromagnetic Linear Motor

  • Fukada, Shigeo;Nishimura, Kentaro
    • International Journal of Precision Engineering and Manufacturing
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    • 제8권2호
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    • pp.49-53
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    • 2007
  • In this study, we investigated experimentally the potential of a planer positioning mechanism with three degrees of freedom using a flexure guide and an electromagnetic linear motor. The goal was to produce a multi-axis positioning system with nanometric resolution over a 1-mm stroke. An $X-Y-\theta$ stage was designed based on previous results from a single-axis prototype and was constructed with a flexure guide mechanism and voice coil motor type linear actuators. We examined the necessity of a driving method and control system to ensure high resolution for multi-axis positioning. Experiments were conducted to evaluate the performance, and the results confirmed the mechanism's potential; fine point-to-point (PTP) positioning was achieved over a 1-mm stroke, with a resolution of 2 nm for translation in X-Y and 0.01 asec for yaw in $\theta$.

CDIDF로기전된 비선형신형기에 의한 직유전동기의 속도제어 (Speed Control of DC Motor by a Nonlinear Compensator Describing the CDIDF)

  • Hyoung-Ki Lee;Hong-Gon Ha;Byung-Do Yoon
    • 대한전기학회논문지
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    • 제37권2호
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    • pp.130-137
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    • 1988
  • The technique of dual-input describing function's synthesis is introduced and the construction of a nonlinear compensator, based on this technique, is proposed. A nonlinear compensator, describing a complex DIDF depending upon amplitude of the second sinusoidal input signal only, is also proposed, where the second sinusoidal input signal is supplied to the nonlinear compensator by external generator. This compensator, connected in a closed loop of the PI speed control of DC motor, can improve the speed response in view instability limit cycle, low speed response and disturbance of the dynamic shift of the Nyquist's critical point -1 + j O. It is verified theoretically that the improvement of speed response of DC motor using the proposed compensator is achieved by means of the dynamic shift of the Nyquist's critical point on the complex plane, and the speed characterstics of DC motor is to be tested through experiment for its performance.