• 전기학회논문지
• /
• 제56권11호
• /
• pp.1930-1936
• /
• 2007

According to previously published paper the phase advance angle is adopted to the BLDC motor drive with high speed. The report proposed describes the optimum algorism that phase current is in phase with the initial flat region of back EMF. This report studies the need of more leading phase advance angle compared with in phase concept between phase current and back EMF. In case of high reactance this report proposes the more phase advance angle than in phase. The test results more rms value of phase current and output power due to more phase advance angle than in phase. It will be helped the high power operation of BLDC motor at high speed.

• 전력전자학회논문지
• /
• 제7권3호
• /
• pp.237-243
• /
• 2002

단상 위상각제어시스템의 경우 제어기의 구조상의 단순함과 저가격화로 인해 많은 노이즈가 발생함에도 불구하고 트라이액 교류 위상각제어기를 속도제어기로 사용하고 있다. 시판되는 진공청소기의 경우 트라이액의 위상각을 조절하여 속도를 제어하고 있는데 고조파전류의 발생을 최소화로 하기 위해서 속도의 선형성을 고려하지는 않고 제작하고 있는 경우가 대부분이다. 본 논문에서는 진공청소기용 위상각 제어기에 파라미터 추정에 의한 실제작 시스템으로 고조파가 많이 발생되는 특정 트라이액 트리거 위상각에서도 고조파전류가 효과적으로 감소되고 부수적으로 지연각이 없어지는 고조파전류 감쇠용 위상제어기의 설계 및 제작하여 실험을 통해 입증하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 D
• /
• pp.2070-2072
• /
• 2002

In this paper, advance angle control is described to drive an industrial low voltage SRM(Switched reluctance motor) for a forklift truck by changing velocity and torque. The high current SRM is designed and its phase resistance and phase inductance are very low to inject high current into the phase windings. In this reason, the current has to be built up in the increasing phase inductance part as soon as possible. Therefore, the phase switch must be turned on before the phase inductance increases, and this angle is called as the advance angle. We analyze the changes of the advance angle as its torque and velocity are changed in the real SRM driving experiment. And we propose the way to improve the SRM performance by using the advance angle control.

• 조명전기설비학회논문지
• /
• 제12권1호
• /
• pp.26-34
• /
• 1998

본 연구에서는 복권형 하이브리드 스테핑 전동기의 Lead Angle에 따른 순시 상전류값의 변화를 보이고 이를 실험적으로 확인하였다. Lead Angle에 따른 순시 상전류값의 변화는 상권선이 여기된 시점에서의 회전자 위치에 대한 정보를 제공한다. 따라서 복권형 하이브리드 스테핑 전동기의 폐루프 운전을 위한 회전자 위치검출 방법으로서 전동기의 순시 상전류를 이용할 수 있음을 보였다. 복권형 하이브리드 스테핑 전동기의 모델링을 통해 Lead Angle 함수로 주어지는 순시 상전류 식을 제시하였으며, 컴퓨터 시뮬레이션을 통해 순시 상전류와 회전자 자극위치와의 관계를 도시하고 분석하였고, 상전압 인가후 $\pi/2$ 시점에서의 순시 상전류값을 측정하여 회전자 자극위치 정보를 얻을 수 있음을 실험적으로 확인하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제52권6호
• /
• pp.262-270
• /
• 2003

In this paper, the characteristics of single-phase line-start permanent magnet synchronous motor driven by constant voltage are analyzed on d-q axis vector diagram and compared with that of current controlled motor. The coupled method of symmetrical coordinates and d-q axis voltage equation are applied to the analysis method like the analysis of single-phase induction motor. From the result of the analysis, it is seen that motors driven by constant voltage source have effects on not only the amplitude of current and torque but also current and current phase angle, so overall characteristics such as power factor and load angle are affected by circuit parameters. For precise analysis and design of single-phase line-start synchronous motor, its characteristics should be analyzed on d-q axis vector plan in consideration of the variation of circuit parameters.

• 전력전자학회논문지
• /
• 제28권1호
• /
• pp.59-67
• /
• 2023

This paper explores the variation of DC-Link current ripple analysis in terms of duty cycle and phase angle of Multi-phase/Multi-stage boost converter. A 2-Stage/1-Stage boost converter DC-Link current is used to determine the difference between the 1st stage diode current and the 2nd stage inductor current. Each stage boost converter diode and inductor current is subordinate to the phase angle and duty cycle. The magnitude of the ripple current is variable according to phase angle and duty cycle. The analysis results are verified by variation of DC-Link current ripple using a 1kW typical 2-stage/1-stage boost converter.

• Journal of Electrical Engineering and Technology
• /
• 제8권6호
• /
• pp.1345-1351
• /
• 2013

Variable iron loss as function of current phase angle of Interior Permanent Magnet Synchronous Motor(IPMSM) was calculated through Curve Fitting Method(CFM). Also, a magnetic flux density distribution of iron core according to current phase angle was analyzed, and an iron loss calculation was performed including harmonic distortion. The experiment was performed by production of non-magnetizing model for the separation of mechanical loss, and the iron loss was calculated by the measurement of input using power analyzer and output power using dynamometer. Some error was generated between experimental results and calculation value, but an iron loss diminution according to current phase angle followed a same pattern. So, errors were generated by measurement, vibration, noise, harmonic distortion loss, etc.

• 전기학회논문지
• /
• 제62권2호
• /
• pp.171-176
• /
• 2013

Classically, reluctance torque of IPMSM(Interior Permanent Magnet Synchronous Motor) by using inductance according to current phase angle generates an error. This error is affected by total torque. From current phase angle $0^{\circ}$ to large errors will occur, because reluctance torque include current phase angle. But, reluctance torque from steady-state voltage equation of IPMSM is represented by linkage flux. So, reluctance torque is unrelated to the current phase angle formula can be derived. In this paper, operating torque was analyzed by d, q-axis linkage flux of IPMSM and reluctance torque to perform calculations reduced the error of the total torque calculation.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 합동 추계학술대회 논문집 정보 및 제어부문
• /
• pp.22-25
• /
• 2001

In this paper, a fuzzy advance angle control method is described to drive an industrial low voltage SRM (Switched Reluctance Motor) for 10kW forklift truck. SRM has a highly non-linear characteristic that is due to change the rotor and stator. And low voltage SRM is designed that its phase resistance and phase inductance is very low to inject high current into the phase windings. In this reason, the proper current control is necessary to drive the low voltage SRM efficiently. SRM has positive torque at increasing inductance region and negative torque at decreasing inductance region. Due to this reason, the current has to be built up in the increasing phase inductance part as soon as possible. Therefore, the phase switch must be turned on before the phase inductance increases, and this angle is called as the advance angle. Also, the phase current has to be dropped before the phase inductance decreases. Fuzzy logic is a flexible and general-purposed method of implementing non-linear functions and as such it is useful in control applications. Consequently, we designed a fuzzy advance angle controller to control the phase current appropriately.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2001년도 전력전자학술대회 논문집
• /
• pp.231-234
• /
• 2001

The torque of SRM depends on phase current and the derivative of inductance. But the inductance of SRM is nonlinearly changed according to rotor position angle and phase current because of saturation in magnetic circuit. Therefore this has a concern in torque ripple and speed variation, and it is difficult to control the desired torque The torque of SRM depends on phase current and the derivative of inductance. But the inductance of SRM is nonlinearly changed according to rotor position angle and phase current because of saturation in magnetic circuit, and it is difficult to control the desired torque. This paper proposes an optimization control scheme by adjusting both the turn-on and turn-off angle according to high efficiency points which are simulated by GA-Neural Network, which is used to simulate the reasonable switching angle which is nonlinearly varied with rotor speed and load.