• Title/Summary/Keyword: Centrifugal motors

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The Auxiliary Winding Control Characteristics of Single-Phase Induction Motor by Universal Starting Switch (범용 기동기에 의한 단상유도전동기의 보조권선 제어 특성)

  • 임홍우;임병옥;정수복;조금배;백형래
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.6
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    • pp.396-401
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    • 2004
  • Single phase induction motor(SPIM) is one of the most widely used type of low power AC motors in the world, especially for domestic or commercial applications where a three phase power supply is not available. Single phase induction motors have no starting torque their own. So there are several ways of starting single phase induction motors. The most common type is the starting capacitor installed in series with the auxiliary winding to increase the starting torque. In the conventional systems, this function is conducted by a centrifugal switch. But the mechanical centrifugal switch has many problems such as switch malfunction. This paper presents the auxiliary winding control using digital universal starting switch to overcome these shortcomings of centrifugal switch.

Dosing of Inductor Electronic Starting Switch of Single Phase Induction Motor (단상유도전동기의 인덕터 전자식 기동기 설계)

  • Seo, K.S.;Park, S.K.;Park, J.W.;Park, J.H.;Cho, G.B.;Baek, H.L.
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.267-270
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    • 2002
  • Fractional horse power single phase induction motors have no starting torque their own. So there are several ways of starting single phase induction motors. The most common type is the starting capacitor installed in series with the auxiliary winding to increase the starting torque. Also, the auxiliary winding is disconnected once the speed of the motor reaches 70 to 80 [%] of the rated speed. In the conventional systems, this function is conducted by a centrifugal switch. But the mechanical centrifugal switch has many problems such as switch malfunction. This paper presents the new methods of electronic starting switch by inductor to overcome these shortcomings of centrifugal switch.

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Air-Barrier Width Prediction of Interior Permanent Magnet Motor for Electric Vehicle Considering Fatigue Failure by Centrifugal Force

  • Kim, Sung-Jin;Jung, Sang-Yong;Kim, Yong-Jae
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.952-957
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    • 2015
  • Recently, the interior permanent magnet (IPM) motors for electric vehicle (EV) traction motor are being extensively researched because of its high energy density and high efficiency. The traction motor for EV requires high power and high efficiency at the wide driving region. Therefore, it is essential to fully consider the characteristics of the motor from low speed to high-speed driving regions. Especially, when the motor is driven at high speed, a significant centrifugal force is applied to the rotor. Thus, the rotor must be stably structured and be fully endured at the critical speed. In this paper, aims to examine the characteristics of the IPM motor by adjusting the width of air-barrier according to the permanent magnet position which is critical in designing an IPM motor for EV traction motors and to conduct a centrifugal force analysis for grasping mechanical safety.

Application of Generalized Experimental Data Correlation in Centrifugal Compressor Design (원시험 데이터 일반화를 적용한 원심압축기 설계)

  • Cho, Gyu-Sik;Kim, Jin-Han;Yang, Soo-Seok;Lee, Dae-Sung;Mileshin, Victor I.
    • The KSFM Journal of Fluid Machinery
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    • v.3 no.4 s.9
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    • pp.38-43
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    • 2000
  • Recently, KARI(Korea Aerospace Research Institute, Korea) and CIAM(Central Institute of Aviation Motors, Russia) have made an effort in developing a centrifugal compressor for a small gas turbine engine as part of a collaboration program. This compressor has been designed as a sub-component for an axial-centrifugal compression system for a small turbo-shaft engine aiming adiabatic efficiency higher than 0.81. The geometrical design requirement imposes restrictions to have high inlet hub-to-tip ratio and inlet swirl flow. In this study, the compressor has been designed using the generalized experimental data established from those compressors having pressure ratio of 3.7 to 5. From this generalized empirical correlation, desirable values of design parameters could be obtained. Subsequently, quasi-3D and 3D viscous flow analyses have been performed to ensure the adopted methodology. It is expected that the centrifugal compressor provides total pressure ratio of 4.89, corrected mass flow-rate of 1.64kg/sec, and adiabatic efficiency of 0.815 with inlet hub-to-tip ratio of 0.641. These relatively high total pressure ratio and inlet hub-to-tip ratio are the main distinctive features in this design. Besides, one of the main features of this centrifugal compressor is the adoption of a double-row bladed diffuser to effectively decelerate the transonic flow leaving the impeller. The compressor has been manufactured and will be tested in the near future.

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THE PERFORMANCE IMPROVEMENT OF VACUUM CLEANER BY ANALYSIS OF THE FLOW AROUND CENTRIFUGAL FAN (진공청소기용 원심팬 주위의 유동해석을 통한 성능개선)

  • Park, J.W.;Ki, M.C.;Park, H.K.
    • 한국전산유체공학회:학술대회논문집
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    • 2007.10a
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    • pp.82-87
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    • 2007
  • A cleaner has trouble with too much noise and power consumption. To solve these problems, the investigation for motors, which are the main component of vacuum cleaner, is required. However, it is difficult to analyze the flow by the experimental means because of the high speed of the fan rotation ranging from 30,000 rpm to 50,000 rpm. Moreover it takes much time to perform the numerical simulation for the flow. In this research, it is aimed to analyse the flow through the centrifugal fan which is believed to be a main noise source, by the computational method. The efficiency of the centrifugal fan is affected by friction loss, shock loss and so on. Those losses depend on factors like the velocity of impeller, blade shape and etc. Accordingly, the influence of the shape of impeller on the flow is investigated in this study. The computational analysis was done by changing impeller shapes. The flow around the centrifugal fan is simulated by applying the moving mesh. To verify the validity of the computation results, the air flow rate and the pressure field to the cleaner is compared with the experimental data. All simulations are performed by using commercial code SC/Tetra. The calculated results show good agreement with the experimental ones qualitatively and it is believed to be promising to use computational simulation in the improvement of the vacuum cleaner performance.

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Development of an Electronic Starter for Single Phase Induction Motor (단상 유도전동기의 전자식 기동장치 개발)

  • Jung, Hyeung-Woo;Baik, Won-Sik;Kim, Min-Huei;Kim, Dong-Hee;Park, Dong-Han
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.397-399
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    • 2007
  • This paper presents a simple electronic starter for single phase induction motor (SPIM). It replaces the centrifugal switch in the auxiliary winding circuit of the capacitor start type SPIM. The centrifugal switch disconnects the auxiliary winding when the motor gets close to its rated speed. The presence of the centrifugal switch, with its possibly fluttering contacts, reduce reliability of SPIM. The operation principle of the proposed electronic starter is explained, and illustrated with experimental results.

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A Study on the Starting Characteristic of Variable Speed Centrifugal Chiller (가변속 터보냉동기의 기동특성에 관한 연구)

  • Kim, Hee-Sun;Yun, Hong-Min;Na, Seung-Ho
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.512-513
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    • 2012
  • The electric motor is essential to drive turbo machinery. In order to overcome the speed limitations of general motors, the inverter is used to perform high speed to tens of rpm. The high speed drives are widely used in many applications such as turbo blower, turbo centrifugal compressors, and pump using air bearing technique. Starting of high speed motor can cause step out, stall, oscillation of motor because the phase inductance is much smaller than that of ordinary motor. This paper studied on the starting characteristic of variable speed centrifugal chiller considering high speed motor characteristics. Finally, the superiority of the inverter is verified by experimental results.

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Design to Reduce Cost and Improve the Mechanical Durability of IPMSM in Traction Motors

  • Lee, Ki-Doek;Lee, Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.5
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    • pp.106-114
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    • 2014
  • The interior permanent-magnet synchronous motor (IPMSM) is often used for the traction motor of hybrid electric vehicles (HEVs) and electric vehicles (EVs) due to its high power density and wide speed range. This paper introduces the 120kW class IPMSM for traction motors in military trucks. This system, as a SHEV (series hybrid electric vehicle), requires a traction motor that can generate high torque. This study introduces a way to reduce costs by proposing a design approach that creates reluctance torque that can be maximized by varying the dq-axis inductance. If a model designed by a design approach meets the desired torque, the magnetic torque can be reduced by an amount equal to the increase in reluctance torque and consequently the amount of permanent magnets can be reduced. A reduction gear and high speed operation of motors are necessary for the miniaturization of the motor. Thus, a fairly large centrifugal force is generated due to the high speed rotation. This force causes mechanical interference between the rotor and the stator, and a design approach for adding an iron bridge is explained to solve the interference. In this study, the initial model and the improved model that reduces cost and improves mechanical durability are compared by FEA, and the models are produced. Finally, the FEM results were verified experimentally.

Design of a Capacitor Starting Switch for SPIM Using Microcontroller (마이크로 컨트롤러를 이용한 콘덴서 기동형 단상 유도전동기의 기동기 설계)

  • Kim, S.K.;Baek, H.L.;Cho, G.B.;Seo, K.S.;Park, S.K.;Lim, Y.S.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.224-227
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    • 2003
  • Single phase induction motor(SPIM) is one of the most widely used type of low power AC motors in the world, especially for domestic or commercial applications where a three phase power supply is not available. Fractional horse power of the SPIM have no starting torque their own. So there are several ways of starting SPIMS. The most common type is the starting capacitor installed in series with the auxiliary winding to increase the starting torque. Also, the auxiliary winding is disconnected once the speed of the motor reaches 70 to 80 [%] of the rated speed. In the conventional systems, this function is conducted by a centrifugal switch. But the mechanical centrifugal switch has many problems such as switch malfunction. This paper presents the starter design of SPIM capacitor starting switch using microcontroller.

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A Study on the Position Control of the parallelogram link DD Robot Using Neural Network (신경회로망을 이용한 평행링크 DD로봇의 위치제어)

  • 김성대
    • Journal of the Korean Institute of Telematics and Electronics T
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    • v.36T no.3
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    • pp.64-71
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    • 1999
  • In this paper, two degree of freedom parallelogram link mechanism is used as DD(Direct-drive) robot mechanism. In parallelogram link mechanism, two motors being established in each base frame, the mass of motor itself is not loaded to anther motor; the number of links are increased, the mass of arm being lighter; with the estabilishment of link parameter, nonlinearity such as the centrifugal force disappears; at the same time anti-interference between motors can be realized. And to realize highy-accurate drive of parallelogram link DD robot manipulator, to improve the learning speed through the design of leaning control system using neural network, to raise adapting power to the varied work objects; the learning control algorithm is composed of neural network and feedback controller in this paper.

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