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자기동이 가능한 2상 SRM의 자기적 특성에 관한 연구
이치우(Chee-Woo Lee),오석규(Seok-Gyu Oh) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.9
중소형 가변속 전동기구는 성능뿐만 아니라 가격경쟁력이 중요한 요인 중에 하나로 인식되고 있다. 가변속 전동기중에서 SRM을 중소형 전동기로서 적용할 때 가격경쟁력 측면에서 보면 단상이나 2상이 적합하다. 그러한 이유로 전력용량이 비교적 작은 가정용 전동기구에는 거의 단상 혹은 2상 SRM이 연구되고 있다. 그러나 단상 SRM은 근본적으로 발생토오크가 불연속적이여서 운전특성이 떨어지고 자기동능력이 없어 기동을 위한 보조적인 장치가 항상 필요하다. 또한 2상 SRM은 연속적인 토오크를 만들 수 있으나 기동에 관해서는 아직도 많은 문제점을 안고 있다. 제안한 2상 6/3 SRM은 일반적인 다른 SRM과 달리 고정자 철심에 자속의 교번 없이 구동이 가능하여 철손을 줄일 수 있다. 또한 일반적으로 단상과 2상의 SRM에서 실용화에 있어서 가장 장애가 된 자기동이 안 되는 문제점을 회전자의 비대칭 형상을 이용하여 구동특성의 저하없이 자기동 능력을 가지게 되었다. 특성 해석을 위해 FEM 해석프로그램인 FLUX2D을 사용하였다. Cost reduction requires lowering number of power devices used in the converter driving SRM This is quite feasible in SRM drive systems than in other drive systems. This paper deals with analysis and simulation of a novel two phase SRM A novel two phase SRM has high performance, self-starting capability, high efficiency, and low manufacturing cost. Additionally, the stator back iron does not experience any flux reversal as the flux is in the same direction whether phase A or B is excited leading to a greater reduction in core losses. The magnetic analysis and design considerations of the novel two phase SRM have been obtained by the finite element analysis (FEM).
오석규(Seok-Gyu Oh),이치우(Chee-Woo Lee) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.1
In small-power applications, variable-speed motors having high efficiency and controllability become more dominant than brushed DC motors. BLDC motors with permanent magnets in the rotor and SRMs directed by reluctance torque due to no permanent magnets have been strongly studied as a candidate. Compared to the BLDC motors, SRMs are more suitable for low-cost applications since the magnetic structure is simple, mechanically robust, and cheap due to no additional excitation in the rotor such as copper wire, aluminum, and permanent magnets. In addition, relatively small number of phases in single and two-phase SRMs allows more cost savings with regards to material in the motor and switching devices in the converter. In this paper, several 2 phase SRMs are compared to a 3 phase 6/4 SRM in terms of flux distribution in key parts of the motors.
운동 에너지를 고려한 Flywheel Energy Storage System 설계와 진동 저감을 위한 3상 유도기의 슬롯수 산정에 관한 연구
류재호(Jae Ho Ryu),김희민(Hui Min Kim),이치우(Chee Woo Lee),박관수(Gwan Soo Park),정동욱(Dong Wook Jeong) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.1
Flywheel Energy Storage System (FESS) is composed by flywheel generating rotating potential energy and motor/generator set charging and discharging electric potential energy. The flywheel and motor/generator is connected by rotating shaft. And torque characteristics of motor/generator part can influence charging and mechanical traits of FESS. This paper analyze about motor/generator design method of 5 [kWh] FESS and torque ripple, harmonic effects by change of slots. At First, this paper proposes a method to estimate the flywheel size and the rotor size of the motor from the the rotational kinetic energy by inertia of FESS. The number of induction motor rotor slots for torque ripple reduction in the high speed operation region is selected. This paper performs to reduce the noise and vibration of the flywheel composed of coaxial with motor/generator and flywheel and realize the high efficiency.
적응제어기법에 의한 Switched Reluctance Motor 드라이브의 성능개선
황영문,이치우 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
SRM의 발생토오크는 회전자 위치각에 따른 가변 인던턴스 변화율과 상전류의 자승에 비례하는 특징이 있다. 회전자 위치각과 상전류에 따른 가변 인덕턴스 변화율은 자기포화현상에 의해 변하게 되며 자기포화에 따른 가변 인덕턴스 변활율은 토오크리플을 유발하게 된다. SRM 드라이브는 동적 운전조건을 결정하는 많은 파라메터가 있으므로 다변하는 시스템에 유용한 적응제어기법을 사용하여 램프형 전류를 만들 수 있다. 따라서 본 논문에서는 전압 보상제어와 동적 도통각 및 속도제어를 이용한 적응제어기법을 도입하여 평활 토오크를 위한 램프형 보상전류를 갖게 하여 토오크리플을 현저하게 저감시킬 수 있었다. The torque in SRM is proportional to the inductance variation as the rotor position and the square of the phase current. An inductance variation according to the rotor position and the phase current is changed by the magnetic saturation. And the ripple in generated torque is resulted from the inductance variation with the magnetic saturation. SRM drive has many variable parameters to determine dynamic performance. As result, the adaptive control technique that is available for multi-variable system is used for ramp type current. This paper suggests that adaptive control technique, which consists of voltage compensating control an dynamic dwell angle and speed control, is used to reduce torque ripple and this suggested scheme is able to shape ramp type current which makes the generated torque flattened.
에어컨 냉각 팬용 브러쉬레스 DC 전동기의 역기전력 분석에 대한 연구
조정현,김지현,정정원,황흥식,이치우 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-
Compared to conventional dc motors having the combination of commutators and brushes, a brushless DC (BLDC) motor is one of the highly efficient motors due to its electrical commutation without a brush, and this feature allows the BLDC otor to be more suitable for an application requiring no maintenance due to mechanical wear between a commutator and a brush. Also, the BLDC motor has a few benefits over both a dc motor and an induction motor such as high dynamic response, high efficiency, logn life span, and low noise in wide speed-torque region. This paper investigates the variation of voltage induced in phase windings in a BLDC motor in several cases with respect to stack length, steel grade, and coil material. This study is numerically conducted and it is verified from the theoritical point of view by comparing the result of simulation with that of experimental measurement.