• Title/Summary/Keyword: Field Weakening

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Advanced Field Weakening Control for Maximum Output Power Operation of Seawater Cooling Pump Induction Motor in a Limited Environment (제한된 환경에서의 해수냉각펌프용 유도전동기 최대출력 운전을 위한 약계자 제어)

  • Son, Yung-Deug;Seo, Yong-Joo;Jung, Jun-Hyung;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.6
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    • pp.540-546
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    • 2013
  • The induction motor is used for driving the special equipments such as warship and submarine pump due to robust structure and simple maintenance. Domestic and foreign warships use a wide range of voltages and the DC voltage sources mainly from battery. In the low voltage level, the ${\Delta}$-connection operation of induction motor can be used for the maximum power. However, the temperature of the inverter increases because of the high input current. On the other hand, Y-connection operation of the induction motor does not cause a problem of temperature because of the low input current compared to the ${\Delta}$-connection. But the lack of the supply voltage can not be avoided. Therefore, this paper suggests the algorithm of the optimum field weakening control to extend the operating range of the induction motor with maximum power in a limited thermal and DC voltage condition.

Advanced Field Weakening Control for Maximum Output Power Operation of Induction Motor in a Limited Environment

  • Seo, Yong-Joo;Go, Hee-Young;Kim, Jang-Mok
    • Proceedings of the KIPE Conference
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    • 2012.11a
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    • pp.217-218
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    • 2012
  • A load motor used for warship or submarine is with limited volume and weight, also specific environmental tests like impact, vibration, noise, temperature and EMC/EMI have to be satisfied. Induction motors, synchronous motors, BLDC motor and etc, are used depending on the purpose of using military equipment. Induction Motors are used for a number of military equipment more commonly due to the robust structure and simple maintenance. Domestic and foreign warships have a wide range of voltages as the DC voltage sources with battery are mainly used for them. The ${\Delta}-connection$ operation of the induction motor is required to make the maximum power in a low voltage level. But the elements' temperature of the inverter increases due to high input current when it is in the ${\Delta}-connection$ operation. Therefore, the induction motor must be driven with the Y-connection. The lack of voltage needs to be with the field weakening control. This paper suggests the optimum field weakening control algorithm to drive the induction motor with maximum power in a limited thermal and DC voltage condition.

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A Study on Starting Algorithm of Large Synchronous Motor for Gas Turbine in Field-Weakening Region using SFC (SFC를 이용한 약계자 영역에서 가스터빈용 동기 전동기의 기동 알고리즘에 관한 연구)

  • Ryu, Ho-Seon;Lee, Joo-Hyun;Kang, Youn-Jong;Hwang, Seon-Hwan;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.6
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    • pp.411-419
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    • 2008
  • SFC(Static Frequence Converter)system has come to be used as start up drive system for large synchronous motor in many industry applications. Many papers have been presented the control algorithm for pumped storage power generation using SFC system but they did not included about start up algorithm of SFC system for gas turbine. This paper presents the field weakening control algorithm for a large synchronous motor using output signal of anti-windup in PI current regulator and the results of experiment show that the proposed algorithm is proper and effective.

High Efficiency Drive of Dual Inverter Driven SPMSM with Parallel Split Stator

  • Lee, Yongjae;Ha, Jung-Ik
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.2
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    • pp.216-224
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    • 2013
  • This paper describes dual inverter drive for a fractional-slot concentrated winding permanent magnet synchronous machine (PMSM). PMSMs are widely used in many applications from small servo motors to few megawatts generators thanks to its high efficiency and torque density. Especially, fractional-slot concentrated winding PMSM is very popular in the applications where wide operation range is required because it shows very wide constant power speed ratios. High speed operation, however, requires lots of negative daxis current for reducing back-EMF regardless of output torque. Field weakening current does not contribute to the torque generation in surface mounted PMSM case and causes inverter and copper loss. To reduce the losses from field weakening current, this paper proposes PMSM with split stator and parallel dual inverter drive. Proposed parallel dual inverter drive reduces back-EMF and enables efficient drive at high speed and light load situation. Control strategy of proposed dual inverter system is established through loss analysis and simulation. Proposed concept is verified with practical experiment.

High Speed Operation of Spindle Motor in the Field Weakening Region (약계자 영역에서의 스핀들 모터 고속운전)

  • Yu J-S;Park S-H;Yoon J-M;Shin S-C;Won C-Y;Choi C;Lee S-H
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.2
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    • pp.186-193
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    • 2005
  • This paper presents a strategy to drive built in-type spindle induction motor which is used as CNC(Computer Numerical Control) in the industry. Gopinath model flux estimator which is composed of current model to be profitable in the low speed range and voltage model to be profitable in the high speed range is used for rotor flux estimation. Moreover this paper presents to drive the spindle motor in the high speed range by using the flux weakening control. High speed operation of spindle motor in the field weakening region is verified through simulations and experiments.

Improvement of Speed Control for Spindle Induction Motor in the Field Weakening Region using a Fuzzy Controller (퍼지 제어기를 이용한 약계자 영역에서 스핀들 유도전동기의 속도제어 개선)

  • Yu, Jae-Sung;Sin, Soo-Cheol;Yoon, Ju-Man;Won, Chung-Yuen;Kim, Sang-Hoon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.8
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    • pp.48-55
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    • 2005
  • This paper presents a new speed control scheme of the spindle induction motor(IM) using fuzzy controller(FC) in field weakening region. The implementation of the proposed FC based spindle Induction Motor(IM) is compared to those obtained from the conventional PI controller based drive system. The simulation and experimental results show that the FC is the high performance more than the conventional PI speed controller in the spindle drive systems.

Maximum Torque Control of SynRM with Speed Estimation of ANN (ANN의 속도추정에 의한 SynRM의 최대토크 제어)

  • Ko, Jae-Sub;Lee, Jung-Chul;Lee, Hong-Gyun;Nam, Su-Myeong;Choi, Jung-Sik;Park, Bung-Sang;Chung, Dong-Hwa
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1456-1458
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    • 2005
  • In this paper, a new approach for the synchronous reluctance motor control which ensures producing maximum torque per ampere(MIPA) over the entire field weakening region is presented. In addition, This paper presents a speed sensorless control scheme of SynRM using artificial neural network. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The proposed scheme is verified validity through simulation.

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The High Performance Flux Weakening Control of Interior Permanent Magnet Synchronous Motor (매입형 영구자석 동기전동기의 고성능 약계자 제어)

  • Lee, Jung-Ho;Kim, Jang-Mok;Won, Jong-Soo
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.1051-1053
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    • 1993
  • In this paper, the new flux weakening contol algorithm for the drive system of Interior Permanent Magnet Synchronous Motor(IPMSM) is proposed which includes the feedback of torque and current The torque error is used in order to control the current phase angle in the field weakening control. The proposed control method is compared with the stator flux oriented vector control method. Through the simulation the prominence of the proposed control method is verified.

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An Improved Speed Estimation Scheme for Induction Motor Drive in the Field Weakening Region

  • Shin Myoung-Ho;Kim Dae-il;Hyun Dong-Seok
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.829-833
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    • 2001
  • In a conventional speed sensorless stator flux­oriented (SFO) induction machine drive system, the estimated speed is delayed in transients by the use of a low pass filter. This paper investigates the problem of a conventional speed sensorless SFO system due to the delay of the estimated speed in the field weakening region. In addition, this paper proposes a method to estimate exactly speed by using Kalman filter. The proposed method is verified by simulation and experiment with a 5-hp induction motor drive.

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