• Title, Summary, Keyword: Motor Point

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Experimental Verification for Optimal Efficiency Model of Inverter-Fed Induction Motor (인버터 구동 유도 전동기의 최적 효율 모델 확인 실험)

  • 김재우;김병택;권병일
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.5
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    • pp.277-282
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    • 2004
  • The optimal design of the rotor slot for inverter-fed induction motor was performed. The purpose of the paper is to verify the optimal point by experiment. A sensitivity analysis is performed, and the models near to an optimal point are selected. In the selecting process of models, 2 design variables with high sensitivity are selected out of 5 design variables. On the basis of the selected variables, 2 models near to the optimal point are decided. The tim e-step F.E.A and the experiment are performed. Optimal point and performance improvement of the optimal mode are verified.

A Study on Balanced Operation for Efficiency Improvement of Single Phase Induction Motor (단상유도전동기의 효율개선을 위한 평형운전에 관한 연구)

  • Baek, Soo-Whang;Kim, Byung-Taek;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • pp.143-145
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    • 2006
  • In this paper, single phase induction motor achieved improvement in efficiency by adapting the condition of Balanced operation and Quasi-balanced operation. Also, the process of efficiency improvement to find the optimum point of secondary resistance and running capacitor for working single phase induction motor is performed in order to attain the conclusion to put out the maximum efficiency at the rated operation point with meeting the starting torque.

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Design and Characteristics Analysis of Switched Reluctance Motor for Electric Power Pallet Vehicle (전동지게차용 스위치드 릴럭턴스 전동기 설계 및 특성해석)

  • Oh, Ju-Hwan;Lee, Byeong-Seok;Lee, Choon-Tack;Jung, Woo-Yong;Kwon, Byung-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.11
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    • pp.511-518
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    • 2005
  • This paper presents the design and drive characteristics of a switched reluctance motor for an electric power pallet vehicle. The designed switched reluctance motor is redesigned by using the finite element analysis(FEA) as a variation of the pole-arc angle for the purpose of an electric power pallet vehicle performance. The output power and torque characteristics of a switched reluctance motor are variable by switching angles of the commutator. Therefor this paper is studied about relationship between the output power and torque characteristics of a switched reluctance motor according to switching angles. The output power of the characteristic point of an electric power pallet vehicle has been shown by experiment. The designed motor drive system operates with the low voltage and high current with using the battery. The core and frame temperatures were described. In this paper, the designed motor is shown better drive characteristics than the DC motor from the rated to maximum, which is verified by the finite element analysis and experimental results.

Design of Sensorless BLDC Motor Driver Using Variable Voltage and Back-EMF Differential Line (가변 전압기와 역기전력 차동방식을 이용한 센서리스 BLDC 전동기 드라이버 설계)

  • Lee, Myoungseok;Kong, Kyoungchul
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.10
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    • pp.910-916
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    • 2015
  • A sensorless motor control scheme with conventional back-Electro Motive Force (EMF) sensing based on zero crossing point (ZCP) detection has been widely used in various applications. However, there are several problems with the conventional method for effectively driving sensorless brushless motors. For example, a phase mismatch of 30 degrees occurs between the ZCP and commutation time. Additionally, most of the motor speed/current controls are achieved based on a pulse width modulation (PWM) method, which generates significant noise that distracts the back-EMF sensing. Due to the PWM switching, the ZCP is not deterministic, and thus the efficiency of the motor is reduced because the phase transition points become uncertain. Moreover, the motor driving performance is degraded at a low speed range due to the effect of PWM noise. To solve these problems, an improved back-EMF detection method based on a differential line method is proposed in this paper. In addition, the proposed sensorless BLDC driver addresses the problems by using a variable voltage driver generated from a buck converter. The variable voltage driver does not generate the PWM switching noise. Consequently, the proposed sensorless motor driver improves 1) the signal-to-noise ratio of back-EMF, 2) the operation range of a BLDC motor, and 3) the torque characteristics. The proposed sensorless motor driver is verified through simulations and experiments.

A Study on a Control Method for Small BLDC Motor Sensorless Drive with the Single Phase BEMF and the Neutral Point (소형 BLDC 전동기 센서리스 드라이브의 단상 역기전력과 중성점을 이용한 제어기법 연구)

  • Jo, June-Woo;Hwang, Don-Ha;Hwang, Young-Gi;Jung, Tae-Uk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.9
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    • pp.1-7
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    • 2014
  • Brushless Direct Current(BLDC) Motor is essential to measure a rotor position because of that this motor type needs to synchronize the rotor's position and changeover phase current instead of a brush and commutator used on the existing dc motor. Recently, many researches have studied on sensorless control drive for BLDC motor. The conventional control methods are a compensation value dq, Kalman filter, Fuzzy logic, Neurons neural network, and the like. These methods has difficulties of detecting BEMF accurately at low speed because of low BEMF voltage and switching noise. And also, the operation is long and complex. So, it is required a high-performance microprocessor. Therefore, it is not suitable for a small BLDC motor sensorless drive. This paper presents control methods suitable for economic small BLDC motor sensorless drive which are an improved design of the BEMF detection circuit, simplifying a complex algorithm and computation time reduction. The improved motor sensorless drive is verified stability and validity through being designed, manufactured and analyzed.

Design and Analysis of a L shape two touch point ultrasonic rotary motor (L형 2타점 회전모터의 설계와 해석)

  • Kim, Sung-Hyun;Kim, Hang-Sik;Park, Tae-Gone
    • Proceedings of the KIEE Conference
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    • pp.1649-1651
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    • 2004
  • The piezoelectric ceramic is attached between 'L' type guide and 'L' type stator. This motor has rotary motion which is operated by the travelling wave. The basic structure of the two kinds of type motor that called one stator motor, two stator motor is same but we suggested a few parameters for considering their stator design and characteristics. As a result, the two stator type motor is much more useful than one stator type motor for bi-direction rotation.

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Development of a Dynamic Motor on Smart Touch Control of one Point Linkage drag (1 포인트 드래그 연동 스마트 터치 제어용 다이나믹 모터 개발)

  • Kim, Hee-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.3
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    • pp.327-332
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    • 2015
  • Educational robot was introduced as an effective educational tool is to foster scientific creativity and learn the basic principles of science are applied to change the configuration of the educational after-school learning kits for science education. SMEs as a tool to foster scientific creativity center and a variety of educational robot technology and the wide range of games for students and robotic technology development, existing e-Learning by downloading mp3 music or learning content for the robot, such as the provision of specialized content Although the technology is still being developed to take advantage of the professional community formation is insufficient side. Currently, one-point linkage drag Smart Touch control dynamic motor development does not need this motor development is possible for users to easily.

Revolution Characteristics of Piezoelectric Ultrasonic Motor with Stator Configuration (압전 초음파 전동기의 고정자 구조에 따른 회전 특성)

  • Park, Man-Ju;Kim, Jin-Soo
    • Proceedings of the KIEE Conference
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    • pp.749-751
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    • 1998
  • In this study, the wind-mill type ultrasonic motor was fabricated, and then revolution and temperature characteristics of the ultrasonic motor were measured. Brass metal was pressed with umbrella-type using metal mold, then slot of 4 kind was processed in each of thickness. Among sixteen's ultrasonic motors, heat loss on applied voltage was much at stator of the highest resonant point, but heat loss on applied voltage was almost neglected at the lowest resonant point of stator. The thickener thickness of elastic body, revolution speed was decreased. The more slot of elastic body, revolution speed was increased. Applied voltage was changed from $10V_{max}$ to $100V_{max}$. When applied voltage was under $20V_{max}$, ultrasonic motor was not rotated. When applied voltage was over $90V_{max}$, revolution of ultrasonic motor was saturated. Maximum revolution speed was 510[rpm].

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Optimal Efficiency Control for Induction Motor Drives

  • Kim Sang-uk;Choi Jin-ho;Kim Bo-youl;Kim Young-seok
    • Proceedings of the KIPE Conference
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    • pp.428-433
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    • 2001
  • This paper presents the control algorithm for maximum efficiency drives of an induction motor system with the high dynamic performance. This system uses a simple model of the induction motor that includes equations of iron losses. The model, which only requires the parameters of induction motor, is referred to a field-oriented frame. The minimum point of the input power can be obtained at the steady state condition. The reference torque and flux currents for the vector control of induction motors are calculated by the optimal efficiency control algorithm. The drive system with the proposed efficiency optimization controller has been implemented by a 32 bit floating point TMS320C32 DSP chip. The results show the effectiveness of the control strategy proposed for the induction motor drive.

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The AUV design based on component modeling and simulation

  • Kebriaee, Azadeh;Nasiri, Hamidreza
    • Ocean Systems Engineering
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    • v.2 no.2
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    • pp.83-97
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    • 2012
  • In the present work, design procedure and computer simulation of an AUV are documented briefly. The design procedure containing the design of propulsion system and CFD simulation of hydrodynamics behavior of the hull leads to achieve an optimum mechanical performance of AUV system. After designing, a comprehensive one dimensional model including motor, propeller, and AUV hull behavior simulates the whole dynamics of AUV system. In this design, to select the optimum AUV hull, several noses and tails are examined by CFD tools and the brushless motor is selected based on the first order model of DC electrical motor. By calculating thrust and velocity in functional point, OpenProp as a tool to select the optimum propeller is applied and the characteristics of appropriate propeller are determined. Finally, a computer program is developed to simulate the interaction between different components of AUV. The simulation leads to determine the initial acceleration, final velocity, and angular velocity of electrical motor and propeller. Results show the final AUV performance point is in the maximum efficiency regions of DC electrical motor and propeller.