• 제목/요약/키워드: Variable phase angle control

검색결과 40건 처리시간 0.023초

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

  • 박수강;백형래
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권1호
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    • pp.70-76
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    • 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.

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LCD with Tunable Viewing Angle by Thermal Modulation of Optical Layer

  • Gwag, Jin-Seog;Lee, You-Jin;Han, In-Young;Yu, Chang-Jae;Kim, Jae-Hoon
    • Journal of Information Display
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    • 제10권1호
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    • pp.19-23
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    • 2009
  • In this paper, we review the proposed liquid crystal display (LCD) with a tunable viewing angle consisting of a conventional liquid crystal display (LCD) panel and a thermally variable retardation layer (TVRL) characterized by uniformly aligned LC film with transparent indium-tin-oxide electrodes for Joule heating. In the TVRL, nematic phase is transitioned into isotropic by Joule heating. The numerical calculation showed that the intrinsic wide viewing angle was achieved at the isotropic phase of the TVRL by Joule heating, whereas the narrow viewing angle was obtained at the nematic phase of the TVRL. The simulated and experimental results of the proposed LCD show continuous and symmetrical viewing angle characteristics by tuning the retardation of TVRL using Joule heating. The structure of the viewing angle control proposed here is adoptable to all LCD modes with wide viewing angle characteristics.

보조권선의 전력제어에 따른 단상유도전동기의 특성비교 (A Characteristics of SPIM with Power Conversions of Auxiliary Winding)

  • 박수강;서강성;백형래;조금배;임양수;이성길;김동휘
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.1149-1151
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    • 2002
  • In this paper, an auxiliary winding driving system of single-phase induction motors is described. Starting charateristics variations are obtained by controlling the auxiliary winding voltage magnitude and phase angle, while the motor's main winding is directly connected to the local utility. A variable auxiliary winding voltage phase angle is shown to yield significant torque control, providing starting and braking torque. The analysis includes the determination of the relationship between the auxiliary winding voltage phase angle and the phase angle difference between the main and auxiliary winding current. The paper proposed for adjusting an auxiliary winding voltage magnitude and phase angle. Experimental results of motor's starting characteristics with using the DC-AMP and PWM inverter for auxiliary winding power supply are shown. The drive is tested using a dynamometer to experimentally verify the results of the theory.

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SRM 드라이브의 강인한 운전을 위한 PLL 제어 방식 (PLL Control Scheme for Robust Driving of SRM Drive)

  • 오석규;정태욱;박한웅;안진우;황영문
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제48권9호
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    • pp.461-466
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    • 1999
  • The switched reluctance motor (SRM) would have torque ripple if not operated with an MMF waveform specified for switching angle and phase voltage. This paper describes the robustic control scheme that permits the phase torque to be flat by PLL(Phase Locked Loop) controller. In this control scheme, the locked phase signal of PLL controls the switching dwell angle and it's loop filter signal controls the switching voltage adaptively. Experimental results show that stable dynamic performance is obtained for torque and speed together with low torque ripple on the operation of variable loads.

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회전각 보상방식을 이용한 스위치드 리럭턴스 전동기의 센서리스 속도제어 (Sensorless Speed Control of Switched Reluctance Motor Using Rotor Angle Compensation Method)

  • 신규재;윤경용;권영안
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 A
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    • pp.64-66
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    • 1999
  • Switched reluctance motor(SRM) has the advantages of simple structure, low rotor inertia and high efficiency. However, position sensor is essential in SRM in order to synchronize the phase excitation to the rotor position. The position sensors increase the cost of drive system and tend to reduce system reliability. This paper investigates the speed control of sensorless SRM in which the phase current and change rate are utilized in position decision, and the period of dwell angle is variable by compensating the rotor angle. The proposed system consists of position decision, phase locked loop controller, switching angle controller and inverter. The performances in the proposed system are verified through experiments.

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PIC 16계열 마이컴을 이용한 센서리스 SRM의 속도제어 (Sensorless Speed Control of Switched Reluctance Motor Using PIC16 series Micom)

  • 신규재;권영안
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 B
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    • pp.684-686
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    • 2000
  • Switched reluctance motor(SRM) has the advantages of simple structure, low rotor inertia. and high efficiency. However position sensor is essential in SRM in order to synchronize the phase excitation to the rotor position. The position sensors increase the cost of drive system and tend to reduce system reliability. This paper investigates the speed control of sensorless SRM in which the phase current and change rate are utilized in position decision, and the period of dwell angle is variable by compensating the rotor angle for speed control. The proposed system consists of position decision. phase locked loop controller, switching angle controller and inverter. The performances in the proposed system are verified through the experiment.

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부하가변시 3상 PWM 컨버터의 전류제어에 관한 연구 (Current Control of Three Phase PWM Converter for the Variable Load)

  • 이재훈;김은기;전기영;전지용;이승환;오봉환;이훈구;한경희
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2007년도 하계학술대회 논문집
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    • pp.441-443
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    • 2007
  • In this paper, The authors design the current controller which independently control the d, q axis current transformed by the synchronously rotating d, q axis and a Space Vector Pulse Width Modulation(SVPWM) to steadily control the output DC-Link voltage against the variable load of the three phase PWM converter. Also, This study improves the high power factor, stability, and rapid response by the phase angle control using the digital Phase Locked Loop(PLL).

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스위치드 리럭턴스 전동기의 센서리스 속도제어 (Speed Sensorless Control of Switched Reluctance Motor)

  • 신규재;권영안
    • 전기전자학회논문지
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    • 제2권2호
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    • pp.166-172
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    • 1998
  • 스위치드 리럭턴스 전동기는 구조가 간단하고 회전자관성이 작으며 고효율을 가지는 전동기이다. 그러나 회전자 위치각에 적절한 상여자 신호를 동기화하기 위해서는 위치센서가 필수적이다. 이 위치센서로 인하여 구동시스템의 가격상승과 열악한 환경에서 시스템의 신뢰성이 저하되는 문제점을 가지게 된다. 본 논문에서는 위치 및 속도센서가 없는 스위치드 리럭턴스 전동기의 속도제어 시스템을 연구하였다. 센서리스 SRM의 안정된 속도제어를 위하여 회전자 위치검출을 상전류 및 변화율 검출로부터 구하였으며 속도오차에 대하여 도통각 주기폭을 변동하는 속도제어 시스템을 제안하였다. 이 구동시스템은 위치결정회로 속도제어기, 디지탈논리 정류자, 스위칭각 제어기와 인버터로 구성된다. 제안된 시스템은 실험을 통하여 성능을 검증하였다.

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제어시점에 따른 차량 안정성 제어 시스템의 제어 경향 (An Investigation of Con01 Threshold of Vehicle Stability Control System)

  • 정태영;이경수
    • 한국자동차공학회논문집
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    • 제13권5호
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    • pp.195-201
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    • 2005
  • In conventional Vehicle Stability Control (VSC) System, a control threshold is designed by average driver characteristics. Despite the stabilizing effort, VSC causes redundancy to an expert driver. An advanced VSC which has flexibility on its control property is proposed in this study. By using lateral velocity estimator, a control threshold is determined on side slip angle and angular velocity phase plane. Vehicle planar motion model based sliding controller is modified with respect to various control thresholds. The performance of the proposed VSC algorithm has been investigated by human-in-the-loop simulation using a vehicle simulator. The simulation results show that the control threshold has to be determined with respect to the driver steering characteristics. A VSC with variable control thresholds would provide an improvement compared to a VSC with a constant threshold.

Novel SRM Drive Systems Using Variable DC-Link Voltage

  • Jang, Do-Hyun
    • Journal of Power Electronics
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    • 제11권3호
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    • pp.285-293
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    • 2011
  • This paper proposes two SRM driving systems using a variable dc-link voltage controlled by a single-phase inverter. Two SRM converter topologies of a half bridge type and a full bridge type are proposed according to the power circuits of an inverter. The phase current can be controlled by means of a PWM controller at the inverter, and the turn-on/off angle at the phase switches can be controlled by a position sensor at the converter in the drive system. The inverter acts as a peak-current limiter if the transient current exceeds its maximum value. SRMs using the proposed topologies maintain high efficiency due to energy regeneration after the turn-off of power switches. The operational modes of the proposed topologies are verified by simulation and experimental results.