• Title/Summary/Keyword: Starting Method

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Analysis of Slot Leakage Reactance of Submersible Motor with Closed Slots during Starting Transient Operation

  • Bao, Xiaohua;Di, Chong;Fang, Yong
    • Journal of Electrical Engineering and Technology
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    • v.11 no.1
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    • pp.135-142
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    • 2016
  • Generally, closed slots are adopted to reduce the water friction loss in both the stator and the rotor of water filling submersible motor due to the special environment of operation. One of the obvious differences between the traditional induction motors and water filling submersible motors is that the submersible motors only need relatively smaller starting torque. This paper aims to analyze the slot leakage reactance of water filling submersible motor during starting transient operation. An improved analytical method which considered the magnetic saturation of the slot bridge and the skin effect of rotor bars is proposed. The slot permeance factor which has a direct impact on the slot leakage reactance is calculated. Then finite element models with different stator slot types are constructed and search coils are introduced to measure the slot flux linkage. Moreover, the starting performances of the models with two typical stator slots are compared and the flux leakage characteristics are obtained. Finally, the results obtained by finite element method are very close to the results obtained by analytical method.

A Study Of Rotor Slot Shape For The High Starting Torque Performance On Three Phase Induction Motor (3상 유도전동기에서 고 기동TORQUE 특성을 위한 회전자 SLOT 형상에 관한 연구)

  • Kim, Byung-Ha;Jeong, Jang-Sik;Song, Jun-Ho
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.974-976
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    • 1993
  • A design method of three phase induction motors that have characteristics of low starting current and high starting torque is proposed. This design method is based on the traditional theory related to the skin effect and the gap saturation effect. The starting performances and the analysis method are explained in short. Finally, comparison of example design data on electric hoist motor with standard motor is shown.

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Investigation of Convergence of Starting Iteration Vectors for Calculating Natural Modes (고유모드 계산을 위한 초기 반복벡터의 수렴성 연구)

  • Kim, Byoung-Wan;Kyoung, Jo-Hyun;Hong, Sa-Young;Cho, Seok-Kyu;Lee, In-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.717-720
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    • 2004
  • Two modified versions of subspace iteration method using accelerated starting vectors are proposed to efficiently calculate free vibration modes of structures. Proposed methods employ accelerated Lanczos vectors as starting iteration vectors in the subspace iteration method. To investigate the efficiency of proposed methods, two numerical examples are presented.

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The Starting Characteristics of Single-Phase Induction Motor Using Sequence Controller (순서접속제어에 의한 단상유도전동기의 기동특성)

  • 박수강;성경민;조금배;오금곤;백형래;박해암
    • Proceedings of the KIPE Conference
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    • 1996.06a
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    • pp.76-79
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    • 1996
  • The most common for starting a single phase induction motor is to install a starting condenser and a centrifugal switch in series with the auxiliary winding. Though this method is simple, life of single phase induction motor is short because of malfunction of a starting condenser and a centrifugal switch and efficiency improvement has limitation. In this paper, the starting characteristics of SPIM is improved by sequence voltage control strategy of auxiliary winding in removing a starting condenser and a centrifugal switch. Finally, the excellent starting performance of SPIM is shown through simulation and experimental results.

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SIMULATION OF STARTING PROCESS OF DIESEL ENGINE UNDER COLD CONDITIONS

  • Park, J.K.
    • International Journal of Automotive Technology
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    • v.8 no.3
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    • pp.289-298
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    • 2007
  • A nonlinear dynamic simulation model from cranking to idle speed is developed to optimize the cold start process of a diesel engine. Physically-based first order nonlinear differential equations and some algebraic equations describing engine dynamics and starter motor dynamics are used to model the performance of cold starting process which is very complex and involves many components including the cold start aiding method. These equations are solved using numerical schemes to describe the starting process of a diesel engine and to study the effects of cold starting parameters. The validity of this model is examined by a cold start test at $-20^{\circ}C$. Using the developed model the effects of the important starting variables on the cold starting processes were investigated. This model can be served as a tool for designing computer aided control systems that improve cold start performance.

A Study on the Improvement of Starting Characteristics for Single Phase Induction Motor (단상유도전동기 기동특성 개선에 관한 연구)

  • Lim, Yang-Su;Back, Hyung-Lae
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.284-286
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    • 1995
  • The most common for starting a single phase induction motor is to install a starting condenser and a centrifugal switch in series with the auxiliary winding. Though this method is simple, life of single phase induction motor is short because of malfunction of a starting condenser and a centrifugal switch and efficiency improvement has limitation. In this paper, the starting characteristics of SPIM is improved by voltage and phase control strategy of auxiliary winding in removing a starting condenser and a centrifugal switch. Finally, the excellent starting performance of SPIM is shown through simulation and experimental results.

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Conduction Bar Design to Improve Starting Stability of Line Start Synchronous Reluctance Motor (직립 기동형 동기 릴럭턴스 전동기의 기동 안정성 개선을 위한 도체바 설계)

  • Nam, Hyuk;Hong, Jung-Pyo;Jung, Tae-Uk
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.3
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    • pp.131-137
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    • 2006
  • This paper deals with the conductor bar design to improve starting stability of line start synchronous reluctance motor(LSSynRM). As design variables, the number and the shape of conductor bars of rotor are chosen. The starting characteristics are calculated by finite element method(FEM) and the conductor bars are designed to improve the starting torque according to the initial starting rotor position. Finally, the starting characteristic of the designed model are compared with that of the initial model.

A Protection Algorithm for DC Railway Systems Considering Train Starting (기동방식을 고려한 DC급전계통 보호알고리즘)

  • Kwon Y. J.;Choi D. M.;Kang S. H.;Han M. S.;Lee J. K.
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.307-309
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    • 2004
  • A DC railway system has low feeder voltage, The remote fault current can be smaller than the current of load starting. So it is important to discriminate between the small fault current and the train starting current. The train starting current increases step by step but the fault current increases all at once. So the type of $\bigtriangleup I\;relay(50F)$ was developed using the different characteristics between the load starting current and the fault current. As for the train starting current, the time constant of train current at each step is much smaller than that of the fault current. To detect faults in U railway systems, an algorithm that is independent of train starting current. This algorithm use the time constant calculated by the method of least squares is presented in this paper.

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A Study on the Forging Process Development of the Commutator of an Automotive Starting Motor (자동차용 시동 모터 정류자의 단조공정 개발에 관한 연구)

  • 서명규;배원병;정호승;조종래
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.905-909
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    • 2002
  • Commutators of a starting motor for automobiles has been produced through various processes such as forging, segmenting, and assembling. And the conventional method producing an automotive motor commutator is not appropriate for saving material and cost, because it makes each segment separated one by one. Therefore a new process design is required in oder to avoid the assembling process. In this study, a new process design of the commutator of an automotive starting motor has been carried out to save material and manufacturing time by FE analysis. In the FE analysis, three forging processes are proposed for producing the copper(ASTM Cl1000) commutators of a starting motor. And forging experiments are performed to make an unsegmented commutator in order to verify the theoretically proposed process. And then, in order to get the final product, the forged commutator is passed through various postprocessing such as resin terming, and machining. From the experimental result, the forging process proposed from the FE analysis is verified to be an economical method for producing the commutator of an automotive starting motor.

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A New Starting Method of Brushless DC Motor without Position Sensor (위치 센서가 없는 소형 BLDC 전동기의 기동 방법에 관한 연구)

  • Lee Wook-Jin;Sul Seung-Ki
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.646-650
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    • 2004
  • This paper presents a novel method to detect the rotor position of the BrushLess DC(BLDC) motor at standstill and a start-up method to accelerate the rotor up to a certain speed where the conventional position sensorless control methods based on the back EMF could work reasonably The proposed initial rotor position estimation method is suitable to avoid the temporary reverse rotation or the starting failure. This method can be implemented using only one current sensor at DC link of the inverter. It does not depend on the model of the motor , and it is robust to motor parameter variations. By the proposed method, it is demonstrated experimentally that a stable starting can be achieved even with severe mechanical disturbance.

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