• Title/Summary/Keyword: fuzzy variable switching sector

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Direct Torque Control for Induction Motors Using Fuzzy Variable Switching Sector (퍼지 가변스위칭 섹터기법를 이용한 유도전동기의 직접토크 제어)

  • 윤인식;서영민;류지수;이기상;홍순찬
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.233-233
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    • 2000
  • Direct torque control (DTC) scheme provides a very quick torque response without the complex field-orientation block and inner current regulation loop. DTC is known as an appropriate scheme for high power induction motet drives because it can be used at lower switching frequency. There are two major drawbacks with the application of DTC schemes : one is large current harmonics due to flux drooping in a low speed range, the other is that the inverter switching frequency is varying according to motor parameters and operating speed. Switching devices in the power electronics drives should be supported for relatively high switching frequency. In this paper, a P-type fuzzy controller to realize the variable switching sector scheme and a PID-type fuzzy switching frequency regulator are adopted. A meaningful contribution of this paper is to propose a simple realization scheme of the fuzzy switching frequency regulator. Simulation results show the effectiveness of those propositions.

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New Fuzzy Variable Switching Sector Technique for DTC on Induction Motor Drives (유도전동기 직접토크제어를 위한 새로운 퍼지 가변스위칭 섹터기법)

  • Ryu Ji-Su;Lee Kee-Sang;Hong Soon-Chan
    • Proceedings of the KIPE Conference
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    • 2001.12a
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    • pp.11-14
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    • 2001
  • Direct torque control (DTC) scheme provides a very quick torque response without the complex field-orientation block and inner current regulation loop. DTC is known as an appropriate scheme for high power induction motor drives because it can be used at lower switching frequency There are a major drawbacks with the application of DTC schemes it is large current harmonics due to flux drooping in a low speed range. In order to solve the problem, the fuzzy variable switching sector scheme are adopted in this paper. A meaningful contribution of this paper is to propose a simple realization scheme of the fuzzy variable switching sector technique. Experimental results show the effectiveness of this proposition.

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New Fuzzy Variable Switching Sector Technique for DTC on Induction Motor Drives (유도전동기 직접토크제어를 위한 새로운 퍼지 가변 스위칭섹터 기법)

  • 柳 志 帥;洪 淳 瓚;李 起 常
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.2
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    • pp.137-148
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    • 2002
  • Direct Torque Control(DTC) is considered to be an useful control scheme of high performance induction motor drives because the scheme provides a quick torque response without requiring the complex field-orientation block and inner current regulation loop. Among a few drawbacks of the conventional DTC scheme, large current harmonics due to flux drooping phenomenon in a low speed range may be the major difficulty In order to remove the difficulty, a fuzzy variable switching sector scheme and its real-time implementation algorithm are proposed in this paper. A DSP based control board is designed for the Induction motor drives with the DTC scheme including the fuzzy switching sector algorithm. Simulation and experimental results show the effectiveness of the proposed scheme.