• 제목, 요약, 키워드: double-rotor

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이중 제로터의 설계 및 응용 가능성에 대한 연구 (Design and Feasibility Study of Double Gerotor)

  • 이성철
    • Tribology and Lubricants
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    • v.35 no.4
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    • pp.215-221
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    • 2019
  • A gerotor set consists of two elements, an inner rotor and an outer rotor. The outer rotor has one more tooth than the inner rotor and has its centerline positioned at a fixed eccentricity from the centerline of the inner rotor. Although gerotors come in a variety of geometric configurations, all gerotor sets share the basic principle of having generated tooth profiles that provide continuous tight sealing during operation. The size of the gerotor is proportional to the number of teeth and the amount of eccentricity. The interior of an inner rotor with a large number of teeth has an enough space to include other machine elements. In this paper, the double gerotor mechanism, constructed by putting a small gerotor in the interior of a large inner rotor, is conceptualized. The double gerotor set is composed of an inner rotor, a planetary rotor, and an outer rotor. The inside profile of the planetary rotor corresponds to the outer rotor profile of the small gerotor, and the outside profile is the inner rotor profile of the large gerotor. In the double gerotor, the centers of the inner and the outer rotor are coincident because the eccentricities of two gerotors are balanced. The operation of a double gerotor is examined by analyzing the planetary motion, and a feasibility study for application of the double gerotor for hydraulic motors and pumps is performed. The double gerotor set has much application potential as a component of hydraulic systems.

외측회전형 이중 농형 유도전동기에 관한 연구 (A Study on the outside rotor type double squirrel cage Induction motor)

  • 김현수;배철오;안병원
    • 한국마린엔지니어링학회지
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    • v.27 no.6
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    • pp.776-782
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    • 2003
  • This paper describes a newly developed double squirrel cage induction motor in which the rotor is located outside the stator. The outside rotor type brushless dc motor has been used for VTR's head drum and PC's cooling fan, but this kind of induction motor has not been developed yet. The parameters of outside rotor type induction motor were measured from the locked rotor test and no load test. It is possible to determine the parameters which are presented in the steady-state equivalent-circuit of the outside rotor type induction motor. Load test of induction motor was carried out using a dynamometer. For the characteristics of torque, efficiency, power factor and output. the developed double squirrel cage induction motor is compared with the ordinary induction motor It is believed that the results of this paper can be used for the development of the outside rotor type induction motor.

심구 또는 이중 농형 회전자를 가진 유도기의 전동 또는 발전 운전시 특성 해석 (Characteristics Analysis for Motor or Generator Operating of Induction Machine with Deep or Double Cage Rotor)

  • 김종겸
    • 신재생에너지
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    • v.10 no.4
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    • pp.3-8
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    • 2014
  • Both of induction generator and synchronous generator is available in the hydroelectric power plant. If the output of the power station is large, the synchronous generator is mainly used but when its output is low, the induction generator is often used. If the output capacity is small, there is a case in which induction motor is used as a generator. Torque at rated operation and start of the induction motor is different depending on the shape of the rotor. Small and medium-sized squirrel-cage induction motor is used primarily double cage rotor or deep bar. In this study, we attempt to interpret characteristics for double cage rotor or deep bar that occur when operating in the induction generator based on the parameters that have been designed and manufactured as an induction motor.

공압용 더블챔버 로터에서 베인개수에 따른 성능특성에 관한 실험적연구 (An Experimental Study of Performance Characteristics on a Double Chamber Rotor Operated by High Pressure Air with Various Vanes)

  • 조종현;최상규;조수용
    • 한국유체기계학회 논문집
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    • v.9 no.6
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    • pp.54-62
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    • 2006
  • An experiment about performance characteristics is conducted on a double chamber vane-type rotor. Three different rotors, which have 6, 8 and 9 vanes, are applied to the driver and various lift holes at the rear plate are used to increase the effective vane height. The inner diameter of a double chamber cylinder is ${\phi}27mm$, and the length of the cylinder is 65 mm. The maximum offset length between the rotor outer surface and the cylinder inner surface is 4.5 mm. In this study, specific output torques and powers are measured, and also noise and vibration are measured at the real operating situation. The operating torque on the double chamber is increased to 17% compared to the operating torque obtained at the single chamber which has the same size. The experimental results of noise and vibration show that the operating sound and vibration are directly related to the operating power generated by the double chamber rotor.

플라이휠 에너지 저장 시스템용 양측식 영구자석 동기 전동/발전기의 착자 형태에 따른 특성 비교 (Characteristic comparison of double-side PMSM/G according to magnetization pattern for flywheel energy storage system)

  • 장석명;최지환;유대준;성소영;한상철;이정필
    • 대한전기학회:학술대회논문집
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    • pp.1021-1022
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    • 2011
  • This paper presents the double side PM synchronous motor/generator for core loss reduction in flywheel energy storage system. The use of double PM rotor causes the elimination of core loss in no-load state of machine. Because flywheel rotational speed is reduced by core loss, double PM rotor is very effective in flywheel system. This paper suggests two types of double side PM rotor, Halbach magnetized array and parallel magnetized array. And characteristic comparison according to thickness of rotor back core is performed.

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Sub-Synchronous Range of Operation for a Wind Driven Double-Fed Induction Generator

  • Saleh, Mahmoud Abdel Halim;Eskander, Mona Naguib
    • Journal of Power Electronics
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    • v.10 no.1
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    • pp.72-78
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    • 2010
  • In this paper the operation of a double-fed wound-rotor induction machine, coupled to a wind turbine, as a generator at sub-synchronous speeds is investigated. A novel approach is used in the analysis, namely, the rotor power flow approach. The conditions necessary for operating the machine as a double-fed induction generator (DFIG) are deduced. Formulae describing the factors affecting the range of sub-synchronous speeds within which generation occurs are deduced. The variations in the magnitude and phase angle of the voltage injected to the rotor circuit as the speed of the machine changes to achieve generation at the widest possible sub-synchronous speed range is presented. Also, the effect of the rotor parameters on the generation range is presented. The analysis proved that the generation range could increase from sub-synchronous to super-synchronous speeds, which increases the amount of energy captured by the wind energy conversion system (WECS) as result of utilizing the power available in the wind at low wind speeds.

단상 유도형 동기 전동기의 효율 향상을 위한 회전자 형상 최적화 (Optimal Design of Line-start Permanent Magnet Motor for High efficiency Performance with double-barrier rotor design)

  • 방량;이병화;홍정표;남혁;하승형
    • 대한전기학회:학술대회논문집
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    • pp.768-769
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    • 2008
  • This paper examines an design of double-barrier rotor structure for improving the efficiency performance in a single-phase line-start permanent magnet(LSPM) motor. By utilizing the advantages of double-barrier rotor design that by increasing reluctance torque generation to compensate magnet torque production, the copper loss reduction is achieved. The optimal approach of response surface methodogy(RSM) is performed for determining a optimum double-barrier rotor structure. The improving of efficiency performance is confirmed by finite element method(FEM) and test.

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대칭3상2중롱형유도전동기의 시뮬레이션 (Simulation of three-phase symmetrical squirrel cage induction motors with double rotor bars)

  • 임달호;이은웅;장석명;구태만
    • 전기의세계
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    • v.30 no.6
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    • pp.366-374
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    • 1981
  • In most cases, simulation of induction machines under dynamic conditions have been based on two-phase models using constant circuit parameters. Squirrel cage induction machines with double rotor bars which are made for high starting torgue have lower rotor bars of sufficient depth they cannot be accurately represented by a constant rotor resistance under all operating condition. In this paper, the circuit of three-phase symmetrical induction machines is represented in two-axis model by tensor. A method for simulating three-phase squirrel cage induction machines in a dynamic conditions is presented, and the current distribution in double rotor bars is calculated under dynamic conditions.

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Optimum Rotor Shaping for Torque Improvement of Double Stator Switched Reluctance Motor

  • Tavakkoli, Mohammadali;Moallem, Mehdi
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1315-1323
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    • 2014
  • Although the power density in Double Stator Switched Reluctance Motor (DSSRM) has been improved, the torque ripple is still very high. So, it is important to reduce the torque ripple for specific applications such as Electric Vehicles (EVs). In This paper, an effective rotor shaping optimization technique for torque ripple reduction of DSSRM is presented. This method leads to the lower torque pulsation without significant reduction in the average torque. The method is based on shape optimization of the rotor using Finite Element Method and Taguchi's optimization method for rotor reshaping for redistribution of the flux so that the phase inductance profile has smoother variation as the rotor poles move into alignment with excited stator poles. To check on new design robustness, mechanical analysis was used to evaluate structural conformity against local electromagnetic forces which cause vibration and deformation. The results show that this shape optimization technique has profound effect on the torque ripple reduction.

발전기 회전자권선 단락센서의 이중화구조 실험결과 분석 (Analytic Results for the Double Short Turn Sensor Structure of Rotor Winding in Generators)

  • 이영준;주영호
    • 대한전기학회:학술대회논문집
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    • pp.2054-2055
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    • 2008
  • Due to the severe operation environment, the accidents in the rotor winding increase lately. To prevent the rotor's damage from short turn phenomena, research staffs in Korea Electric Power Research Institute develop sensors to detect short turn efficiently. In this paper, we present the double-structured short turn sensor which evluates the healthiness of rotor winding.

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