• Title, Summary, Keyword: synchronous generator

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Design of Magnet Shape for Axial-Flux Type Permanent-Magnet Synchronous Generator with Dual Air-Gap (횡자속형 2중 공극 영구자석 동기발전기의 마그네트 형상설계)

  • Choi K.H.;Kim K.S.;Jin M.C.;Hwang D.H.;Bae S.W.;Kim D.H.;Ro C.G.
    • Proceedings of the KIPE Conference
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    • pp.828-831
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    • 2003
  • This paper presents a novel design technique and characteristic analysis of Magnet for dual air-gap axial-flux type permanent-magnet synchronous generator. The process of magnet design is applied to the motor design and steady state analysis considering output voltage waveforms and magnetic flux waveforms. Design and construction of an axial-flux permanent-magnet generator with power output at 60 [Hz], 300[r/min] is introduced. Finite-element (FE) method is applied to analyze magnet shape characteristics. The results of FE analysis show generator is feasible for use with dual air-gap axial-flux permanent- magnet synchronous generator.

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Design and Characteristics Analysis of the 78 kWe Grade Synchronous Generator for Disused Diesel Engines

  • Youn, Jun-Seop;Kim, Hae-Joong;Kim, Youn-Hwan;Moon, Jae-Won
    • Journal of Magnetics
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    • v.22 no.1
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    • pp.122-132
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    • 2017
  • This study dealt with the design process of the 78 kW permanent magnet synchronous generator for engines. After the calculation of the basic dimensions through a theoretical method in the process of initial model design, FEA (finite-element analysis) and a d,q-axis equivalent circuit were used to identify the generator characteristics depending on the number of poles. With the use of the space harmonic analysis method, the back-EMF (electromotive force) and THD were checked, and then the number of slots was determined. In addition, the most optimized generator dimensions were determined through a sizing optimization technique. Based on this, the optimum model with enhanced efficiency, material costs, and temperature characteristics was derived, and the availability of the design method was confirmed through a comparative analysis of the initial and optimum models.

The Comparison of Output Characteristic by the Electro-magnetic Structure Modification of the Axial Flux Type Permanent Magnet Synchronous Generator (종축 자속형 영구자석 동기 발전기의 전자기적 구조 변경에 따른 출력특성 비교)

  • Jung, Tae-Uk;Bae, Byung-Duk;Kim, Hoe-Cheon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.6
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    • pp.42-48
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    • 2011
  • Generally, the structure without the stator core Axial Field Permanent Magnet (AFPM) generator was simple and there was nearly no cogging toque. And because it had the wide driving rate area, it had been being mainly used in the small wind power generation system. However, AFPM generator with non-slotted stator can't generate high voltage at low wind speed due to long air-gap. It is the reason of output efficiency drop. Therefore, in this paper, the AFPM synchronous generator with internal rotor and dual slotted stators for the small wind turbine is studied, and deal with a cogging torque minimization through the determination of optimum pole-arc ratio.

1MVA synchronous generator control for vessel used for digital AVR of drop method (Drop 방식의 디지털 AVR을 이용한 1MVA급 선박용 동기발전기 제어)

  • Yoo, Dong-Hwan;Hwang, Chun-Hwan;Park, Sang-Hoon;Yoo, Jae-Sung;Lee, Sang-Suk;Won, Chung-Yuen
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.225-229
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    • 2007
  • The output voltage of a synchronous generator is regulated constantly by field current control of excitation system. Synchronous generator exciter has two type, first one is Drop control type by thyristor and second one is exciter current control type through power output by PWM control. Control method of the second one prevails, but when the power devices have a breakdown, output voltage of the generator rises rapidly. This exciter must have a protection circuit and system is complicated, so reliability is poor Excitation control type which is drop control type control only 10% of the power, so it can be improved precision. When a trouble come to the controller, output voltage of a generator don't rise excessively and the voltage rise about 10%, so it has a excellent reliability. This paper prove stability of the digital AVR.

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Design of Magnetic Slot Wedge Shape for Reducing Cogging Torque in Permanent Magnet Synchronous Generator of Direct Drive Type (직구동 방식 영구자석 동기 발전기의 코깅 토크 저감을 위한 자성체 슬롯 ��지 형상 설계)

  • Moon, Jae-Won;Kim, Seung-Joo;Choi, Han-Suk;Park, Su-Kang;Kim, Bong-Ju;Kwon, Byung-Il
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.3
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    • pp.80-87
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    • 2012
  • This paper suggests the slot wedge shape for reducing the cogging torque of a direct-drive permanent magnet synchronous generator for a bike. To consider easy coil winding, we applied a structure of open slot for the permanent magnet synchronous generator (PMSG). Because the cogging torque of PWSG with the open slot is very large, we are designed the appropriate specifications of the PMSG by selected the appropriate material of slot wedge and various slot wedge shapes. The prototype model is selected by design theory for reducing cogging torque and maximizing efficiency of PMSG. And the detailed structure design of the model was designed by the loading distribution method. The PMSG models were analyzed by finite element method. Finally, we have suggested appropriate material of slot wedges and its shape which has benefit to further reducing cogging torque and preventing decreasing of the generating power.

Study on The Preventive Structure of field Lead Connector's V-Notch on Synchronic (동기발전기 회전자 계자접속부의 예각변형 방지구조에 관한 연구)

  • Cho, Ji-Won;Cho, Chang-Joo
    • Proceedings of the KIEE Conference
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    • pp.937-939
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    • 2000
  • The preventive structure of field lead connector's V-notch on synchronous generator has been developed. The preventive structure of field lead, installed in the generator, prevent from V notch of field lead connector in rotor on daily start and stop (on-line). This development of study was performed at the Seoinchon combined cycle power plant on gas turbine generator. This preventive structure of field lead will be prevent from V-notch of field lead on synchronous generator's field.

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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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Characteristic Analysis of the 40kVA High Speed Synchronous Generator considering the Field Current (계자 전류에 따른 40kVA급 고속 동기발전기의 특성 해석)

  • Jang, Seok-Myeong;Ko, Kyoung-Jin;Cho, Han-Wook;Oh, Won-Gku
    • Proceedings of the KIEE Conference
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    • pp.59-61
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    • 2007
  • This paper presents the characteristic analysis of the 40-kVA high speed synchronous generator considering the field current. The generator consist of the rotor with the short-circuited field coils connected armature coils of exciter and the stator with three-phase winding. To analyze the characteristics of the generator, the direct finite element method is applied.

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Stand-Alone Pico-Hydro Generation System using a High-Efficiency IPM Synchronous Generator

  • Kurihara, Kazumi;Kubota, Tomotsugu
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.2
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    • pp.121-125
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    • 2014
  • This paper presents a successful stand-alone pico-hydro generation system using a high-efficiency interior permanent-magnet (IPM) synchronous generator. A 1-kW 4-pole V-type IPM generator with low voltage regulation is used for laboratory test in stand-alone hydro energy conversion system. It has been found from experimental results that the constant output voltage is supplied stably by the proposed system under wide speed range.

Voltage Control of Synchronous Generator for Ships using a PMG Type Digital Automatic Voltage Regulator (PMG Type 디지털 AVR을 이용한 선박용 동기발전기 출력전압제어)

  • Yu, Dong-Hwan;Park, Sang-Hoon;Won, Chung-Yuen;Yu, Jae-Sung;Lee, Sang-Seuk;Ahn, Sung-Joon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.1
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    • pp.38-45
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    • 2009
  • To get the constant output, synchronous generator field excitation is controlled by AVR(Automatic Voltage Regulator). Most of ships generator AVR uses the thyristor phase controlled rectifier. However this rectifier is difficult to realize that the fast control system because its control period is slower than MOSFET and IGBT type converter. Therefore, this paper deals with PMG(Permanent Magnet Generator) type digital AVR using MOSFET switch for ships synchronous generator. The composition of this digital AVR is very simple, the generator is under the short circuit accident, the output voltage becomes zero state and AVR can not operate. Thus generator is required to add CBC(Current Boosting Circuit) in an excitation circuit to flow output current. The performance of the proposed system is evaluated on a 10[kVA] experimental prototype circuit in place of real ships generator.