• Title, Summary, Keyword: double-rotor

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Power and loss characteristics of PMSM/G with double-sided Halbach magnetized rotor (양측식 Halbach 자화 회전자를 갖는 영구자석 동기 전동발전기의 출력 및 손실 특성)

  • Jang, Seok-Myeong;You, Dae-Joon;Choi, Sang-Kyou
    • Proceedings of the KIEE Conference
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    • pp.723-724
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    • 2008
  • The rotational loss is one of the most important problems for the practical applications of PM synchronous motor/generator. This rotational loss is divided as the mechanical loss by windage and bearing and iron loss by hysteresis loop and eddy current in the part of the magnetic field. So, In this paper, a double-sided PMSM/G without the iron loss is designed by analytical method of the magnetic field and estimation of the back-EMF constant represented as the design parameter. This design model consists of the double-sided PM rotor with Halbach magnetized array and coreless 3-phase winding stator. The results show that the double-sided PMSM/G without iron loss can be applicable to the required system without the rotational loss.

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Design of Gerotor with Pin-tooth Inner Rotor (핀치형 내부로터의 제로터 설계)

  • Lee, Sung-chul
    • Tribology and Lubricants
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    • v.36 no.2
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    • pp.64-67
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    • 2020
  • In the conventional gerotor design, the circular arc tooth of the outer rotor is first introduced, and then the inner rotor profile is generated by simulating the outer rotor motion while the inner rotor is fixed. The profile generation of tooth meshing exhibits relativity; therefore, the outer rotor profile can be generated by the movement of the inner rotor. In this study, we propose the design of a gerotor with a pin-tooth inner rotor. First, the pin-tooth inner rotor is devised, and then the outer rotor profile is generated. The profile of the inner rotor is simply composed of equally arranged pins along a circle. The root of the inner rotor is designed as a conjugated arc of two pins. The trajectory of the pin center is obtained by the inner rotor operation, and then the outer rotor profile is determined as a parallel curve of the trajectory. In this gerotor design, the inner rotor has a simple configuration, and contact occurs between the pin parts of the inner rotor and the whole profile of the outer rotor. This affects the material selection and machining process. The pin tooth can be used to design the outer and inner rotors, enabling a double gerotor mechanism corresponding to a planetary gear system.

Experimental Study on the Behavior of Stall Cell in an Axial Flow Fan (축류송풍기의 실속셀 거동에 관한 실험적 연구)

  • Shin You Hwan;Kim Kwang Ho;Kang Chang Sik
    • Proceedings of the KSME Conference
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    • pp.643-646
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    • 2002
  • Experimental study was conducted to reveal the flow mechanism under rotating stall in an axial flow fan. For this study unsteady pressure was measured using high frequency pressure transducers mounted on the casing wall of rotor passage and total pressure fields were measured at the rotor upstream and downstream. The measured pressure signal was analyzed by Wavelet Transform and Double Phase Locked Averaging Technique. From the result of unsteady pressure field of the casing wall, one period of rotating stall was divided into three zones and the flow characteristics on each zone were described in detail. The pressure field was also analyzed in terms of the pressure distribution along pressure side and suction side of blade tip. From the result of total pressure fields at inlet and outlet of the rotor, the useful information on the characteristics of the stall cell in radial direction was provided.

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The Analysis on the Characteristics of the Double-Sided 3 Phase Linear Induction Motor With Conducting Sheet Rotor (Conducting sheet rotor를 갖인 양측방식 3상 직선형 유도전동기의 특성해석)

  • Yun Jong Lee
    • 전기의세계
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    • v.19 no.3
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    • pp.1-9
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    • 1970
  • In this paper, the equation for the generated force is introduced, on the basis of Maxwell's electromagnetic equation, by dividing the air-gap magnetic field into the region of the constant amplitude and the region of the pulsating field in the both ends of iron core, in the case that the typical 3 phase winding is employed in the double sided 3 phase linear induction motor with sheet rotor in accrodance with the winding method of rotary induction machine. With the effect of the overhang region being taken into account, the result, in which the equation is established, inducates that theoretical values nearly coincides with the measured values in the interval of slip s=0-0.8.

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Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

  • Chung, Gyo-Bum;Choi, Jae-Ho
    • Journal of Power Electronics
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    • v.9 no.1
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    • pp.109-116
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    • 2009
  • This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.

A Conceptual Study on the Bearingless Rotor Hub System of Helicopter (헬리콥터 무베어링 로터 허브시스템의 개념 연구)

  • Kim, Deog-Kwan;Kim, Min-Hwan;Yun, Chul-Yong;Kim, Tae-Joo;Kim, Seung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.484-489
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    • 2011
  • In this paper, it was described the current technology status of bearingless rotor hub system for helicopter which is one of major rotor hub system. Also, a conceptual study on the new bearingless rotor hub system of helicopter was described. First, the advantages and disadvantages of major helicopter rotor hub system are described in comparison to each other types of rotor hub system. The unique characteristics of bearingless rotor hub system are described compared to other types of rotor hub systems. Next, the main function, role and characteristics of the sub-components of bearingless rotor hub system are described. Recent helicopters which adopt this bearingless rotor hub system are described and introduced. This conceptual study shows that double-H sectional construction and rectangular construction of flexbeam are the most effective candidates of this new bearingless rotor system. This bearingless rotor hub system can be used for 7,000lbs class helicopter. Now, a further trade-off study will show.

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Characteristics Analysis of Double-layer AFPM Motor (Double-layer AFPM 전동기의 특성해석)

  • Kong, Jeong-Sik;Yoo, Hyune-O;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.24-27
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    • 1999
  • This paper proposed a method to reduce torque ripple of double-layer axial flux permanent magnet motor. Torque is generated by interacting between current of stator winding and airgap flux. In the case of slotless axial flux permanent magnet motor, only commutation torque component is significant. Hence, cogging and reluctance torque will not be considered. For this propose, we were supplied differential phase current in each winding and shifted rotor magnet. According to shifted rotor magnet and flux and phase of current were shifted, phase of developed torque in each side is difference. As a result, we could reduce the total torque ripple in motor and obtain minimum torque ripple in the case of 7.5 degree shifting angle between two rotors.

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Electromagnetic field analysis and performance characteristics of PMSM/G with Halbach magnetized array rotor (Halbach 자화 배열 회전자를 갖는 영구자석 동기 전동발전기의 전자기적 해석 및 성능 특성)

  • Jang, Seok-Myeong;You, Dae-Joon;Ko, Kyoung-Jin;Choi, Sang-Kyu
    • Proceedings of the KIEE Conference
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    • pp.86-88
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    • 2008
  • The rotational loss is one of the most important problems for the practical use of the high power Flywheel Energy Storage System (FESS). This rotational loss is divided as the mechanical loss by windage and bearing and iron loss by hysteresis loop and eddy current in the part of the magnetic field. So, In this paper, a double-sided PMSM/G without the iron loss is designed by analytical method of the magnetic field and estimation of the back-EMF constant represented as the design parameter. This design model consists of the double-sided PM rotor with Halbach magnetized any and coreless 3-phase winding stator. The results show that the double-sided PMSM/G without iron loss can be applicable to the high power FESS.

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Characteristic Analysis of Rotor Losses in High-Speed Permanent Magnet Synchronous Motor (초고속 영구자석형 동기 전동기의 회전자 손실 특성해석)

  • 장석명;조한욱;이성호;양현섭
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.3
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    • pp.143-151
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    • 2004
  • High-speed permanent magnet machines are likely to be a key technology for electric drives and motion control systems for many applications, since they are conductive to high efficiency, high power density, small size and low weight. In high-speed machines, the permanent magnets are often contained within a retaining sleeve. However, the sleeve and the magnets are exposed to high order flux harmonics, which cause parasitic eddy current losses. Rotor losses of high-speed machines are of great importance especially in high-speed applications, because losses heat the rotor, which is often very compact construction and thereby difficult to cool. This causes a danger of demagnetization of the NdFeB permanent magnets. Therefore, special attention should be paid to the prediction of the rotor losses. This paper is concerned with the rotor losses in permanent magnet high-speed machines that are caused by permeance variation due to stator slotting. First, the flux harmonics are determined by double Fourier analysis of the normal flux density data over the rotor surface. And then, the rectilinear model was used to calculate rotor losses in permanent magnet machines. Finally, Poynting vector have been used to investigate the rotor eddy current losses of high-speed Permanent magnet machine.

Study About a New Propulsion System Using CRP( I ) (Flow interaction mechanism of a counter-rotating propeller) (CRP를 사용한 추진기관에 관한 연구( I ) (CRP의 유동상호작용에 관하여))

  • 정진덕;이동호
    • Journal of the Korean Society of Safety
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    • v.10 no.1
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    • pp.3-8
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    • 1995
  • The anemometer measurements were obtained from stationary hot-film probe mounted between the forward and rear rotors of a model CRP which rotated the forward and different directions. Data collection was done at several locations between rotors. To establish rotor-rotor interaction flow mechanism that contributes noise increasement of the CRP, methods of simple and the double condition-at sampling have been developed. The former uses to find similarity of the wake the later fixes the forward rotor position in time or space and permits averaging the mean wake at any fixed rotor angular location. The variation of the forward wake Is strongly depending upon the rear rotor location.

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