• 전력전자학회논문지
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• 제12권4호
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• pp.277-284
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• 2007

본 논문은 전기추진시스템에 사용되는 BLDC 전동기 중에서 최대 토크 특성을 갖는 독립상 BLDC 전동기의 제어 특성에 대하여 기술하고자 한다. 독립 상 전동기는 각 상이 전기적으로 분리된 형태로 구성된 것이 특징이다. 이러한 특징을 분석하기 위하여 Y결선 3상 BLDC 전동기와 독립 3상 BLDC 전동기를 모델링하고, 시뮬레이션을 통하여 비교하였다. 시뮬레이션 결과 Y결선 3상 BLDC 전동기에 비하여 독립 3상 BLDC 전동기가 상전압이 높았다. 고정자 저항 및 인덕턴스가 일정할 때, 높은 상전압은 최대 상전류의 증가를 가져왔고, 이러한 전류 증가는 최대 토크를 증가시킨다. 그러므로 독립상 BLDC 전동기의 상전류를 제어함으로써 독립상 BLDC 전동기의 전류 맥동이 저감됨을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.64-66
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• 2004

Several techniques have been adopted in motor design of interior permanent magnet (IPM) type brushless DC (BLDC) motor to minimize cogging torque. IPM type motor has better ability in the centralization of flux than surface-mounted permanent magnet (SPM) type BLDC motor. So, the structure of IPM type BLDC motor has high saliency ratios that produce additional torque. However, this structure has a significant cogging torque that generates both vibration and noise. This paper describes new technique of the flux barriers design for reduction of cogging torque of IPM type BLDC motor. To reduce the cogging torque, flux barriers are applied in the rotor. Changing the number of barrier, the cogging torque is analyzed by finite clement method(FEM).

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.2518-2523
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• 2007

In this paper, thermo-flow characteristics of an outer-rotor type of a BLDC motor are numerically analyzed using three-dimensional turbulence modeling. In an advance design of BLDC motor, cooling blades and holes are preferred for the enhanced cooling performances. Rotating the blades and holes generates axial air flow passing through stator slots, which cools down stator by forced convection. For the present study, a new design of the BLDC motor has been developed and major design parameters such as the arrangement of cooling holes, the area of cooling holes, and cooling blades and the cooling blade angle, are analyzed for the enhanced convective heat transfer rate. It is found that the convective heat transfer rate of the new BLDC motor model is increased by about 8.1%, compared to that of the reference model.

• 설비공학논문집
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• 제17권12호
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• pp.1169-1176
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• 2005

In this paper, thermal reliability of a closed type BLDC (Brushless DC) motor for high speed axial fan was analyzed by the accelerated life test. The closed type BLDC (Model No. MB1-8855-J01) motor was controlled by PCB module, which was composed of various electrical components. The failure of the closed type BLDC motor happened in PCB module due to high temperature. Failure mechanism of the closed type BLDC motor appears to be electrolyte dry out of capacitor. The accelerate life test was performed in temperature stress of $85^{\circ}C\;and\;105^{\circ}C$, respectively The failure data from the accelerated life test were analyzed and the life in each stress level was estimated with 960h and 261 h. At last, both life expression according to operating temperature of PCB module and life of the closed type BLBC motor in normal condition $(50^{\circ}C)$ were suggested.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.77-79
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• 2004

This paper presents a design and characteristics analysis of interior permanent magnet (IPM) type BLDC motor for electric vehicle. In order to design of IPM type BLDC motor, surface mounted permanent magnet(SPM) type BLDC motor is used as the initial design model. According to the size of permanent magnet, the steady state characteristics is analysized by equivalent magnetic circuit method. The characteristics analysis results of the designed motor is compared with the experimental results.

• 한국전자통신학회논문지
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• 제15권3호
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• pp.503-512
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• 2020

송풍기를 이용한 제품으로는 핸드드라이기, 자동세차기, 건조기, 청소기등이 있다. 이러한 전동기의 특징은 순간에 강한 바람이 나오도록 구조, 제어 알고리즘이 필요하다. 종래의 여자방식에 따른 전동기는 직권식, 분권식, 복권식, 영구자석식이 있다. 이러한 전동기는 고속 회전 시 기동전류가 크고 회전수가 불규칙한 단점이 있다. 이를 개선하고자 고속BLDC 전동기 제어에 관한 연구로 구동회로 설계, 센서리스 제어 알고리즘, 시뮬레이션, 실험 등을 통해 800W급 고속BLDC 모터 제어와 회로 설계하였고, 95% 이상 고효율을 제어기의 운전성능 평가 방법, 시제품 실험 및 검증을 연구하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.3323-3328
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• 2007

Conventional LPG pump for Liquified Petroleum injection(LPi) engine has been adopted vane type. But the BLDC type fuel pump for LPi system has complicated structure and its price is high. Therefore, as a alternative, this study has mainly focused on the development of turbine type LPG pump which has lower cost and simple structure than conventional BLDC type. To verify the possibility of substitute the performance tests were performed for each fuel pump. The comparative items were pressure settling time, variation of fuel outlet temperature and engine performance of hot restart ability. As a result, performances of turbine type LPG pump were equivalent or high comparing to the BLDC type all over the tests for different fuel composition.

• 대한기계학회논문집B
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• 제31권9호
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• pp.772-779
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• 2007

In this paper, thermo-flow characteristics of an outer-rotor type BLDC motor are numerically analyzed using three-dimensional turbulence modeling. On the rotor of the BLDC motor, cooling blades and cooling holes are existed for the enhanced cooling performances. Rotating the blades and holes generates axial air flow streaming into inner rotor side and passing through stator slots, which cools down stator by forced convection. Operating tests are performed and the numerical temperature fields are found to be in good agreement with experimental results. A new design of the BLDC motor has also been developed and major design parameters such as the arrangement of cooling holes, the area of cooling holes and cooling blades, and the cooling blade angle, are analyzed for the enhanced convective heat transfer rate. It is found that the convective heat transfer rate of the new BLDC motor model is increased by about 8.1%, compared to that of the reference model.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 춘계학술대회논문집
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• pp.196-201
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• 2008

This paper is about electromagnetic vibration source in outer rotor type of BLDC motors. Experiments are carried out with three pole-slot combinations which are 6 slots, 12 slots, and 24 slots with 4 poles rotor. According to results, vibration sources separate into electromagnetic and mechanical factors. Using the finite element method (FEM), It is analyed that vibration characteristics of electromagnetic source in each type. This paper shows electromagnetic sensitivity to vibration, and introduces necessary point in lower vibration motors. Also rotor balance is important to prevent uneven distribution of magnetic flux between rotor and stator.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.50-52
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• 2001

The BLDC(Brushless DC) motor with the permanent magnet has many merits such as high efficiency and efficiency. These characteristics of the BLDC motor makes them one of the most popular motors in the world today. The C type ferrite magnet is many used in BLDC motor for high performance, especilly low price. Many papers have been written on the analysis of the BLDC motor with C type ferrite magnet. But, most of these target models are contained symmetric distribution of permanent magnet. In this paper, investigations are made on different distribution of permanent magnets for a understanding of the effects of unequal permanent magnet location on the unbalanced cogging torque. Motor torque and cogging torque are obtained by using the 2 dimensional finite element method.