• Title, Summary, Keyword: double-rotor

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Study on the Design and Manufacture of Solid Iron Motors (괴상 철심 전동기의 설계 및 시작에 관한 연구)

  • 이윤종;백수현
    • 전기의세계
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    • v.27 no.4
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    • pp.52-59
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    • 1978
  • This paper is prepaped, based upon its foundation of the design, first studying the rotor impedance of single and double layer cylindrical induction motor with solid iron rotor, and then inducing torque equation, from it. Classified were some design factors for this design from the result for above and there carried out the evidence of these design and theory after making experimental motors with solid iron rotors and examining torque characteristics.

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A Novel Integrated Generator Converter System for HVDC and Eddy Current of it's Solid Rotor Core (HVDC 송전을 위한 새로운 집적변환 발전기 계통과 그 회전자 중심의 와전류)

  • 이은웅;김일중;이민명
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.7
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    • pp.434-441
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    • 1988
  • This paper proposes a new invention of the integrated generator converter system for the HVDC transmission. And it analyses the general formula for eddy currents in the rotor iron using the double Fourier series in order to trace the smallest eddy current losses of the system which connects a new designed synchronous generator windings or conventional synchronous generator windings with the v Graetz bridges.

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Implementation of Fuzzy Controller for Rotor Side Converter of DFIG

  • Sastrowijoyo, Fajar;Choi, Jaeho
    • Proceedings of the KIPE Conference
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    • pp.131-132
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    • 2012
  • Implementation of fuzzy controller for the rotor side converter of a utility-connected double-fed induction generator (DFIG) for wind power generation systems (WPGS) described in this paper. In the control schemes, real and reactive powers (PQ) at the stator side of DFIG are strictly controlled to supply the power to the grid. A TMS320VC33 DSP is selected as the controller of this system.

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Performance Improvement of Position Estimation by Double-PLL Algorithm in Hall Sensor based PMSM Control (Double-PLL을 이용한 홀 센서 기반 PMSM 제어의 위치 추정 성능 개선)

  • Lee, Song-Cheol;Jung, Young-Seok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.3
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    • pp.270-275
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    • 2017
  • This paper proposes a double-phase-locked-loop (PLL) to improve the performance of position estimation in hall sensor-based permanent magnet synchronous motor control. In hall sensor-based control, a PLL is normally used to estimate the rotor position. The proposed Double-PLL consists of two PLLs, including a reset type integrator. The motor control is more accurate and has better performance than conventional PLL, such as a small estimated position ripple. The validity of the proposed algorithm is verified by simulations and experiments.

A Study on the Variable Speed Control Characteristics of Outside Rotor type Squirrel Cage Induction Motor (외측 회전형 농형 유도전동기의 가변속 운전특성에 관한 연구)

  • 안병원;박영산;노영오;최민선;김성환;김현수
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.418-422
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    • 2001
  • This paper presents a developed squired cage induction motor for axial flow fan. The developed squirrel cage induction noter for axial flow fan is exchanged the position, rotor and stater. In this method a fan blade is attached to outside rotor. So we can protect the motor from rain and reduce noise, and there is no need to have bending duct to locate the fan motor. Carried out experimental test with this induction motor, and the results were as follows. Starting torque was 21kgㆍcm@120V, maximum efficiency was 0.84@120V. The characteristics of tests were the same as double squirrel-cage type IM.

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Analysis of Single-phase Induction Motor Having Space Harmonics in Its Magnetic Field (고주파자속을 고려한 단순상유도전동기의 해석)

  • Keung Yul Oh
    • 전기의세계
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    • v.22 no.3
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    • pp.25-34
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    • 1973
  • In this paper, the characteristics of a single phase induction motor which is considered the space harmonic flux by the double revolving field theory is analysed. As the rotor resistance for the fundamental flux is separated from the resistance for the rotor bar and end-ring, and the rotor leakage reactnace is separated from the skew leakage reactance and the other, so the circuit constants for the space harmonic flux is expressed by the circuit constants for the fundamentals. As the ratio of the circuit constants for the magnetizing reactance is used, the generalized equivalent circuit is made up. the characteristic equation which is able to analysis the subdivided characteristics by the above circuit is induced. The ratio of the circuit constants and the skew angle being changed, the variations of the torque-speed characteristics for the fundamentals and harmonics is examined by this equation.

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Behavior of Rotating Stall Cell in a High Specific-Speed Diagonal Flow Fan

  • Shiomi, Norimasa;Cai, W.X.;Muraoka, A.;Kaneko, K.;Setoguchi, T.
    • Journal of Mechanical Science and Technology
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    • v.15 no.12
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    • pp.1860-1868
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    • 2001
  • An experimental investigation was carried out to clarify unsteady flow fields with rotating stall cell, especially behavior of stall cell, in a high specific-speed diagonal flow fan. As its specific-speed is vary high for a diagonal flow fan, its pressure-flow rate curve tends to indicate unstable characteristics caused by rotating stall similar to axial flow fan. Although for an axial flow fan many researchers have investigated such the flow field, for a diagonal flow fan tittle study has been done. In this study, velocity fields at rotor Inlet in a high specific-speed diagonal flow fan were measured by use of a single slant hot-wire probe. These data were processed by using the "Double Phase-Locked Averaging"(DPLA) technique, i. e. phases of both the rotor blade and the stall cell were taken into account. The behaviors of stall cell at rotor inlet were visualized for the meridional, tangential and radial velocity.

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Sensorless control of PMSM in low speed range using high frequency voltage injection (전압주입 방식을 이용한 PMSM 센서리스 제어에 관한 연구)

  • Yoon Seok-chae;Kim Jang-mok
    • Proceedings of the KIPE Conference
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    • pp.119-122
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    • 2003
  • This paper describes the sensorless technique for the surface-mounted permanent-magent synchronous motor(SPMSM or PMSM) drive based on magnetic saliency. The control technique is a sensorless control algorithm that injects the high frequency voltage to the stator terminal in order to estimate the rotor position and speed. The rotor position and speed for sensorless vector control is achieved by appropriate signal processing to extract the position information from the stator current in the low speed range including zero speed. Proposed sensorless algorithm using the double-band hysteresis controller and initial rotor position detection exhibits excellent reference tracking and increased robustness. Experimental results are presented to verify the feasibility of the proposed control schemes.

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Optimum Design of Rotor System Considering Fuzzy Constraints (퍼지 구속조건을 고려한 회전축계의 최적설계)

  • 양보석;공영모
    • Journal of the Korean Society of Marine Engineering
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    • v.16 no.5
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    • pp.39-49
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    • 1992
  • The dynamic design object of rotor system is to optimize the system in stability at the operating speed, unbalance response in the vicinity of the rotor critical speed, bearing weighting and system weighting. In conventional optimization method, designers have to set mathematical modeling, such as objective function, constraints and design parameters, strictly and quantitavely. But in actual design process, they do not treat all of these values strictly and some of them are somehow "fuzziness". So, considering boundary conditions of seal diameter, clearance, and length in a typical double suction centrifugal pump is fuzzy, this paper is considered fuzzy in constraints. Fuzzy method is used .alpha.-level cut method. Then, the optimum dimensions of seal according to values are obtained and vibration characteristics are investigated.estigated.

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Design and Characteristic Analysis of Double Stator Axial Field 12/10 SRM (이중고정자 횡축 12/10 SRM의 설계 및 특성 해석)

  • Son, Dong-Ho;Ahn, Jin-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.6
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    • pp.730-737
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    • 2018
  • This paper aims to design of a double stator axial field 12/10 SRM. Conventional and single stator axial field SRMs were reviewed to apply for automotive cooling fan. The axial field SRM has the advantage of shorter flux path, higher torque per volume and lower iron loss. However, there is axial eccentricity in single stator axial field SRM due to one side excitation. Therefore, a double stator type is designed in this paper to reduce the axial eccentricity. And the trapezoidal pole shape of the stator increases the flow of magnetic flux from stator to rotor and the torque region. The torque and efficiency are compared and tested with experiments.