• Title/Summary/Keyword: Electronic starting switch

Search Result 9, Processing Time 0.023 seconds

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
    • /
    • 2002.11d
    • /
    • pp.267-270
    • /
    • 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.

  • PDF

A Study on the Main Winding Control of Single Phase Induction Motor using One-Chip Micom (원칩 마이컴을 이용한 단상유도전동기의 주권선 제어에 관한 연구)

  • Park, Su-Gang;Baek, Hyeong-Rae
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.49 no.1
    • /
    • pp.70-76
    • /
    • 2000
  • This paper describes a one-chip micom controller and phase angle control method for self-starting and energy saving of single-phase induction motor. The proposed method is based on the optimal efficiency control which is running by variable phase angle of main winding current such as to maintain the maximum efficiency characteristics of the motor, in voltage control with TRIAC. Experiments are focused on a capacitor starting single-phase induction motor. The optimal energy saving by variable phase angle control are verified by experimental results. Also, auxiliary winding was controlled by electronic starting switch.

  • PDF

Design of Controller for Reducing In-Rush Current of Single-Phase Induction Motor (단상유도전동기의 돌입전류저감을 위한 제어기 설계)

  • Park, Su-Kang;Baek, Hyung-Lae;Lee, Sang-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.50 no.5
    • /
    • pp.238-245
    • /
    • 2001
  • During an AC motor's start-up accelerating period, a large amount of current is required to reach to the rating speed. This is called in-rush current. This peak in-rush current can be more than about several times the operating or steady-state current in the full load rating of the motor. In-rush current is present in both and electronic ballasts. The main area of concern is the tripping of circuit breaker and fuses which can affect electrical system components From this, we can see that the electrical power controllers will be rather concerned, since they have to supply the actual current necessary to start the motor. This paper presents a new method to reducing in-rush current and energy saving of the single-phase induction motor used in air-conditioner. It can be obtained that proposed system is low cost and small size as compared with other controller. Experiments are focused on a capacitor starting single-phase induction motor. The optimal power saving and in-rush current limiting by phase angle control are verified by experimental results. Also, auxiliary winding was controlled by electronic starting switch.

  • PDF

Four-Quadrant Operation of a Single-Switch-based Switched Reluctance Drive (단일 스위치 기반의 4상한 운전 SRM 드라이브)

  • Ha, Keun-Soo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.59 no.2
    • /
    • pp.338-343
    • /
    • 2010
  • Low cost motor drives are being sought for high volume energy efficient home appliances. Key to the realization of such low cost motor drives is to reduce the power electronic converter in terms of its components, particularly the active devices, finding the motor with least complexity for manufacturing and a controller that could extract the desired performance from the machine and converter combination. These and other factors such as self-starting, speed control over a wide range and most of all the crowning aspect of a four quadrant operation with bare minimum number of controllable switch (or switches) remain as formidable challenges for low cost motor drive realization. In this paper, a four quadrant switched reluctance motor (SRM) drive with only one controllable switch is realized by using a two-phase machine. The theory and operation of the proposed four-quadrant SRM drive with the proposed control algorithm for its realization are described. The motor drive is modeled, simulated and analyzed to verify its feasibility for self-starting, speed control and for four quadrant operation and the simulation results are presented. Experimental results confirm the validity of the proposed control algorithm for four quadrant control of the SRM drive. The focus of the paper is mainly directed toward the control algorithm for realizing the four-quadrant operation of the two-phase SRM drive with a single controllable switch converter.

A Development of Electronic Motor Control Systems (전자식 모터제어 시스템 개발)

  • Lee, Sung-Hwan;Yi, Seok-Ju
    • Proceedings of the KIEE Conference
    • /
    • 2000.11a
    • /
    • pp.76-78
    • /
    • 2000
  • The previous MCC's have the demerits of high cost and much manhour for rework because they are impossible for the standardization of products and have many manual connections. The customers require the products which can operate in connection with SCADA system by digitalizing the functions of the current MCC's and are systematized with capability of remote control. To solve these disadvantages and requirements, we developed the Electronic Motor Control System according to starting type for applying to fields based on this. This system has the various functions such as protection, measurement, and communication. Using these functions, it can monitor motor status through communication with the upper system and define the circuit for lower connection cost according to starting type and shorter manufacture period by program. The development of this product results in establishment of competitive structure with domestic competition and perfect automatic monitoring through linkage with SCADA system. In addition, it provides the comparable dominancy of receiving on orders in switch gear and adaptability to change of MCC market in Japan and Europe.

  • PDF

A Study on the Controller for Reducing of In-Rush Current of Inductive Load (유도성 부하의 돌입전류저감을 위한 제어기에 관한 연구)

  • Park, Su-Kang;Cho, Geum-Bae;Baek, Hyung-Lae;Lim, Yang-Su
    • Proceedings of the KIEE Conference
    • /
    • 2000.07b
    • /
    • pp.1345-1347
    • /
    • 2000
  • This paper presents a new method to reducing inrush current and energy saving of capacitor starting single-phase induction motor used in air-conditioner. It can be obtained that proposed system is low cost and small size as compared with other controller. Experiments are focused on a capacitor starting single-phase induction motor. The optimal power saving and in-rush current limiting by phase angle control are verified by experimental results. Also, auxiliary winding was controlled by electronic starting switch.

  • PDF

Rotor Design of Single Phase Switched Reluctance Motor for Advance Angle Control (앞선각 제어를 위한 단상 SRM 회전자설계)

  • Oh, Ju-Hwan;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
    • /
    • 2006.10d
    • /
    • pp.92-94
    • /
    • 2006
  • Single phase switched reluctance motor has a high speed capability, due to its very robust rotor, and requires only one electronic power switch in its control circuitry. The latter feature considerably reduces the cost of the drive system. But it involves starting problem and strongly torque ripple, which means that the motor is not suitable for application that require constant torque or speed. To solve torque ripple and region of these problem, this paper presents a single phase Switched Reluctance Motor model with a barrier rotor pole. Also it is simulated the designed prototype model by FEM for the prediction of characteristics.

  • PDF

A Study of Fabrication of RF Control System for Building Sunshade (건물 차양을 위한 RF제어 시스템 제작에 관한 연구)

  • Park, Jung-Cheul;Chu, Soon-Nam
    • The Journal of the Institute of Internet, Broadcasting and Communication
    • /
    • v.14 no.6
    • /
    • pp.149-157
    • /
    • 2014
  • This paper is based on the fabrication of wireless control system for the building shading device. RF Module was controlled by UHF wireless CC1020 chip which has low electrical power and low electrical voltage. Also 447.8625~447.9875 frequency, 4800Baud data rate and 12.5 kHz channel spacing was controlled by the use of SPDT switch and with Microcontroller program. Furthermore, the helical antenna was used. The starting production of 447.8625~447.9875 kHz wireless electrical power was used. As the result, it did not exceed 10dBm which is the standard of low power wireless system. Shading efficiency was measured at 25%, 50%, 75% direction with controlling the interior temperature and the intensity of illumination at the rate of 1 hour. As the result, the intensity of illumination was lowered to 82~87% at 25% direction with $0.6{\sim}1.4^{\circ}C$ lowered temperature. At 50% direction, the intensity of illumination was lowered to 60~68% with $2.3{\sim}4.1^{\circ}C$ lowered temperature. And at 75% direction, the intensity of illumination was lowered to 41~47% with $3.4{\sim}5.1^{\circ}C$ lowered temperature.

A Study on change from an RTU-based substation to IEC 6 1850-based SA substation (RTU 기반 변전소의 IEC 61850 기반 SA 변전소로의 전환에 대한 실증 연구)

  • Yuk, Sim-Bok;Lee, Sung-Hwan;Kim, Chong-il
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
    • /
    • v.11 no.4
    • /
    • pp.436-444
    • /
    • 2018
  • Currently, the new substation automation uses the international standard IEC 61850 communication protocol. KEPCO is also constructing a new substation based on IEC 61850 from 2013 through the pilot application and research and development starting from 2007. However, there are few cases where existing substations(Transformer, T/L GIS, D/L GIS, etc.) have been used, and RTU based substations operating systems have been changed to SA substations based on IEC 61850. Therefore, the introduction of IEC 61850 in existing substation facilities has the advantage of enhancing the substantiality of the substation by reusing existing facilities, improving the interoperability with the latest substations introduced, and converting existing substations into systems suitable for unmanned operation. In this paper, we introduce a case of changing the existing RTU based substation operation system to digital substation using IEC 61850 field information processor, Ethernet switch and SA operation system. Also, IEC 61850 client authentication program and Wireshark, which is a packet analysis tool, verify IEC 61850 conformance and its feasibility.