• Title/Summary/Keyword: Stator winding

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Practical Optimum Design of Single-phase Induction Motor Based on Balanced Operation Theory (평형운전에 기초한 단상 유도전동기의 실용적인 설계)

  • Baek, Soo-Whang;Kim, Byung-Taek;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2007.04c
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    • pp.129-131
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    • 2007
  • In this paper, we research improvement in efficiency of single-phase induction motor by adapting the condition of the balanced and quasi-balanced operation. we maintain turns of auxiliary winding of the motor and adjust resistance and reactance. In this condition, resistance value and copper loss are much gloater. Namely, this is the condition only for balancing MMF without consideration of copper loss of stator winding. To make more practical design, therefore, we will perform winding design which is based on balanced operation condition and applies copper loss minimum. The problem of deterioration of starting torque is completed by rotor bar shape design.

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Characteristics Analysis of multi-separated winding LDM by Excitation Mode (여자 방식에 따른 다권선 LDM의 특성 해석)

  • Kim, J.P.;Baek, S.H.;Maeng, I.J.;Woo, Y.S.;Kim, I.N.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.804-806
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    • 2001
  • In this paper, by designing ratio width of the permanent magnet versus the stator coil, double excitation LDM with multi-separated winding which is possible to obtain the constant thrust force is proposed. Using Empulse, this paper has explained a various excitation mode to analyze the thrust force of multi-separated winding LDM. The simulation results show single-phase excitation mode have low thrust force ripple.

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A Study on the Expected Life Evaluation of Rotating Machine (회전 기기의 수명 예측 평가에 관한 연구)

  • Kim, Ki-Joon;Kim, Sang-Jin;Oh, Yong-Chei;Seong, Nak-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.10a
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    • pp.73-76
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    • 2000
  • Traction motors that is one of the rotating machines for urban transit EMU have been subjected to increased demand for higher operating temperature, more demanding duty cycles, higher starting current, frequent voltage transients and severe environmental exposure. With the advent of PWM drives using power IGBTs in addition to the thermal considerations, it is important to take into account the impact of the dielectric stress upon the winding insulation system life. In analyzing the life of the stator winding, which is the heart of the motor, the majority of all winding failures are usually caused by a combination of various stresses acting on the insulation materials and system. In this paper, to evaluate the expected life of traction motor for urban transit E.M.U. it is proposed a new test method of complex accelerating degradation.

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Development of Shorted-Turn Diagnosis system for Generator Rotor Winding (발전기 회전자 권선의 층간단락 진단시스템 개발)

  • Lee, Yeong-Jun;Kim, Hui-Dong;Ju, Yeong-Ho
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.11
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    • pp.742-747
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    • 1999
  • On-line diagnosis system has been developed and is now applied the detection of shorted turns in the field winding of large generator. This system consists of data aquisition system and display PC. The data aquisition system detects voltage waveforms from flux probe sensor installed in the stator slot. The display PC shows theshorted-turn situation of generator rotor winding. A shorted-turn diagnosis test wasperformed on five gas turbine generators at the Seoinchon combined cycle power plant. The test was conducted using an new diagnosis system and digital oscilloscope which can identify the pole location, the slot number and the number of shorted turns within each slot. It is confirmed that results of two systems are very same in the field tests.

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A Study on Flux Sensing of Linear Induction Motor Using Tapped Winding (Tapped winding을 이용한 선형유도전동기의 자속검출에 관한 연구)

  • Im, Dal-Ho;Kwon, Byung-Il;Kim, Chang-Eob;Im, Hyung-Bin
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.948-950
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    • 1993
  • A method of flux sensing using tapped winding is described for measuring air gap flux in linear induction motor. This method which utilizes coils of motor itself is neither affected by temperature nor resistive voltage drop due to stator current in the motor coils. So it can measure air gap flux in reliable manner. The tapped wilding method has been implemented in experiment and the result shows that this method can be sufficiently used in direct vector control of linear induction motor.

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A Novel Stator Hybrid Excited Doubly Salient Permanent Magnet Brushless Machine for Electric Vehicles

  • Zhu Xiaoyong;Cheng Ming
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.185-191
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    • 2006
  • In this paper, a novel stator hybrid excited doubly salient permanent magnet (SHEDS-PM) brushless machine with a special magnetic bridge is proposed for the first time. The originality of this machine is purposely to add a magnetic bridge in shunt with each PM pole, which not only maintains the stator lamination in its entireness, but also amplifies the effect of DC field flux on PM flux. An equivalent magnetic circuit is presented to clarify the novelty. Based on the 2-D finite element analysis, the static characteristics of the SHEDS-PM machine, namely phase flux linkage, back-EMF, cogging torque, winding inductance and static torque are deduced. The corresponding results on a prototype machine illustrate that the proposed machine is promising for application to electric vehicles.

Optimization of a Flywheel PMSM with an External Rotor and a Slotless Stator

  • Holm S.R;Polinder H.;Ferreira J.A.
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.3
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    • pp.215-223
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    • 2005
  • An electrical machine for a high-speed flywheel for energy storage in large hybrid electric vehicles is described. Design choices for the machine are motivated: it is a radial-flux external-rotor permanent-magnet synchronous machine without slots in the stator iron and with a shielding cylinder. An analytical model of the machine is briefly introduced whereafter optimization of the machine is discussed. Three optimization criteria were chosen: (1) torque; (2) total stator losses and (3) induced eddy current loss on the rotor. The influence of the following optimization variables on these criteria is investigated: (1) permanent-magnet array; (2) winding distribution and (3) machine geometry. The paper shows that an analytical model of the machine is very useful in optimization.

회전기 고정자권선의 부분방전 진단용 평면 패치센서의 설계 및 실험

  • Yang, Sang-Hyeon;Park, No-Jun;Kim, Chung-Sik;Park, Dae-Hui
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.11a
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    • pp.228-228
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    • 2009
  • In stator windings of a 6.6kV rotating machine, internal discharge, corona discharge, and surface discharge are mainly caused by internal voids and insulation degradation. In the case of the discharge spark and electromagnetic pulse generated from a discharge source, we can detect it using various RF resonators like an EM sensor. In order to detect these types of electromagnetic sources, we designed and fabricated a planar patch sensor using a CST-MWS simulation, and PD signals from artificial defected stator windings were also measured by the sensor proposed in this study. Furthermore, In the results of the experiment, it showed similar performance to the HFCT sensor.

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A Novel Stator Design of Synchronous Reluctance Motor by Loss & Torque Characteristics Related to Slot Numbers using Coupled Preisach Model & FEM (유한요소법과 프라이자흐모델이 결합된 해석기법을 이용한 슬롯수에 따른 손실과 토크 특성 을 통한 동기형 릴럭턴스 전동기 특성분석)

  • Song, Han-Sang;Lee, Jung-Ho;Lee, Byeong-Du
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1053-1054
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    • 2011
  • This paper deals with the stator design solution of a synchronous reluctance motor (SynRM) with various slot numbers by loss & torque characteristics related to the slot open and teeth width using coupled Preisach modeling & FEM. The coupled Finite Elements Analysis (FEA) & Preisach model have been used to evaluate the nonlinear solution. Comparisons are given with characteristics of SynRM according to stator winding, slot number, slot open and teeth width variation.

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A Study on Insulation Property of White Powder Found on High Voltage Motor Stator Winding (백화현상이 나타난 고압전동기 고정자권선의 절연특성 연구)

  • Kong, Tae-Sik;Kim, Hee-Dong;Lee, Sang-Kil;Kim, Kyeong-Yeol;Ju, Young-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1627-1631
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    • 2011
  • During a routine inspection of a large pump motor at power plant, white powder was found on the surface of the stator end windings. Visual inspection and high voltage insulation diagnosis was performed to determine whether this motor is available. The purpose of this paper is to understand the insulation properties of white powder found on high voltage stator and to know prevention of insulation weakness.