• Title, Summary, Keyword: Embedded PM generator

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A Design and Voltage Control of a High Efficiency Generator with PM Exciter (고효율 영구자석 여자기 구조의 발전기 설계와 전압제어)

  • Jo, YeongJun;Lee, Dong-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1827-1834
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    • 2016
  • This paper presents a high efficient generator with PM(Permanent Magnet) exciter. The proposed PM exciter for the generator can produce a linear output voltage according to the engine speed. This output voltage is directly used to control the field current of the generator to adjust the generator output voltage. In the proposed generator system, since the field winding current can be supplied by the PM exciter, the generator can self-start without any battery or an external power supply due to the low residential flux. Furthermore, the operating efficiency of the generator is higher than a conventional winding exciter. The main problem of the proposed generator system, the field winding current controller has to be embedded inside the generator, and it rotates according to the generator shaft. In this paper, the proper embedded current controller is designed for the proposed generator system. Due to the embedded controller cannot be connected to the outside the generator controller, the measured instantaneous output voltage of the generator is transferred by the photo isolated communication using shaft aligned infrared transmitter and receiver to keep the constant generator output voltage. In this paper, 10kW, 380V engine generator with PM exciter and the embedded DAVR(Digital Automatic Voltage Regulator) are described. The proposed high efficiency generator is simulated and tested to verify the effectiveness.

A Design and Control Scheme of a High Efficiency Hybrid PM Generator (고효율 하이브리드 영구자석 발전기의 설계 및 제어방식)

  • Jo, Yeongjun;Lee, Dong-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.2
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    • pp.112-120
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    • 2018
  • This work presents a hybrid generator, which is a combination of a permanent magnet (PM) and winding structure with a PM exciter. The field winding of the proposed hybrid generator is fed by the PM exciter and the embedded current controller, which is installed in the generator shaft. In the no-load condition, the output voltage of the generator is produced by the PM flux of the generator without any field winding current. The field winding current produces an insufficient flux to retain the output voltage of the generator when the load is injected. The total efficiency can be increased from the PM exciter and PM flux of the generator. The field current has to be controlled inside the proposed generator. The generated power from the PM exciter is used to excite the field flux of the generator. The embedded current controller is commanded by the external voltage controller using the infrared wireless method. The 10 kW prototype hybrid PM generator is designed and tested to verify the effectiveness of the proposed system. The experimental results are compared with those of the winding generator with PM exciter.

Alternative Design of 3MW Offshore PM Synchronous Generator (해상용 3 MW 영구자석형 동기발전기의 대안설계)

  • Kim, Dong-Eon;Lee, Hong-Gi;Han, Hong-Sik;Jung, Yung-Gyu;Suh, Hyung-Suck;Chung, Chin-Wha;Lim, Min-Soo;Kwak, Seung-Keun;Oh, Man-Soo;Choi, June-Hyuk
    • 한국신재생에너지학회:학술대회논문집
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    • pp.274-277
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    • 2008
  • Pohang Wind Energy Research Center (PoWER-C) is developing a 3 MW Radial Flux Permanent Magnet (RFPM) Synchronous Generator for offshore Wind Energy Converter (WEC). The blade rotor rpm is 15.7 and the gear ratio is set to be 92.93. The nominal generator rpm at the rated load is about 1459. Baseline design with surface mounted PM magnets are completed. However, there is some concern about the excessive eddy current heating in the magnets. To alleviate this problem, another design with embedded magnet is going on. With embedded magnets, the generator length should be increased to compensate the increased flux leakage. But the field fluctuation in the magnets due to the slots are greatly reduced. This means less eddy currents and lower magnet operating temperature. In this report, engineering efforts for embedded rotor is presented.

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Self-Starting Excitation System with Low-Power Permanent Magnet Generator

  • Cho, Chong Hyun;Lee, Dong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2268-2275
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    • 2018
  • This paper presents a high-efficiency low-power permanent magnet (PM) generator for the power supply of the generator exciter. In the conventional generator system, the power for the exciter is fed by the generator output power or an emergency battery for the starting. The proposed low-power PM generator can generate the proper power and voltage to excite the exciter field winding. According to the starting of the generator, the designed PM generator can supply the constant voltage to the Automatic Voltage Regulator (AVR), then it can be used to control of exciter field current for the generator. Because of the designed PM generator which is placed inside the conventional generator system, the emergency battery and Potential Transducer(PT) for AVR can be removed. Thus, the total efficiency can be improved. The proposed generator system is tested in the practical system. And the efficiency characteristic is analyzed.