• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.104-106
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• 2001

In this paper, it is object of design of high efficiency slotless BLDC motor using film coil. Slotless BLDC motor is able to have high efficiency property and low cogging torque, due to magnetization of stator core have constant contribution by slotless core. But it is difficult to make coil winding of slotless BLDC motor. So we make amateur of slotless BLDC motor using film coil. Film coil is fabricated by drilling, electro-plating and etching of copper/insulator/copper plate. In this paper, after design of slotless BLDC motor for moving axial blower, it is fabricated by NdFeB permanent magnet type rotor and film coil.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권7호
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• pp.320-326
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• 2003

Slotless Permanent Magnet Linear Synchronous Motor (PMLSM) has good control ability but thrust density is low. So, this paper proposes inserted core type of slotless PMLSM to improve its thrust density. Inserting the core between windings of each phase, detent force is generated by the difference of magnetic resistance in an air gap. To minimize detent force, this paper applies the neural network to inserted core type of slotless PMLSM. The, Magnetic pole ratio, the width of the inserted core and the width of the coil are selected as a design parameter to minimize detent force. In comparison with inserted core type one, thrust ripple greatly decreases by minimizing detent force and also thrust increases in this optimal model.

• Journal of Magnetics
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• 제14권1호
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• pp.47-51
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• 2009

The coreless linear synchronous motor (coreless LSM) has been widely used as a driving source of semiconductor production processes for machine speeding up, positioning accuracy and simple maintenance. However, this coreless LSM suffers the disadvantage of decreased thrust force created by the leakage of magnetic flux. With the goal of increasing the generated thrust force and decreasing the cogging force, the slot of the core part was removed and a moving-coil-type slotless LSM (moving-coil-type slotless LSM) is proposed in this paper. Although this moving-coil-type slotless LSM with a back-yoke at the primary side demonstrated an increase in the generated thrust force, it remained capable of generating the cogging force when the primary side was moved due to the position between the permanent magnet and the back-yoke. Therefore, we attempted to decrease the cogging force of the moving-coil-type slotless LSM. We found that the back-yoke length at the primary side needs to be made $0.5{\tau}$ longer than the integral multiple of the magnetic pole pitch in order to decrease the cogging force created by the moving-coil-type slotless LSM.

• 한국전자통신학회논문지
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• 제8권2호
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• pp.285-290
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• 2013

Slotless 선형 동기 전동기(Linear Synchronous Motor)는 가동자의 구조가 간단하고 1차측 철심의 슬롯을 제거하여 갭 중의 자기에너지를 균일화해 추력 변동을 억제할 수 있는 장점을 가지고 있다. 또한 고효율로 구동이 가능하고 제어성이 타 선형 전동기에 비해 뛰어나 반송장치의 적용이 확대 되고 있는 실정이다. 하지만 주거 환경 분야의 적용은 미흡한 실정이다. 따라서 본 논문에서는 Slotless 선형 동기 전동기의 주거 환경 분야 적용을 위해 위치 피드백 제어에 따른 구동 특성을 고찰하고 속도 진동의 최소화와 안정된 응답 특성을 얻기 위해 부하 탑재와 가속도를 변화시켜 위치 피드백 제어를 비교함으로써 제어기의 유용함을 입증한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.855-857
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• 2003

A slotless Permanent Magnet Linear Synchronous Motor (PMLSM) has good control ability but thrust density is low. So, this paper proposes inserted core type of slotless PMLSM to improve its low thrust density. Inserting the core between windings of each phase, detent force is generated by the difference of magnetic resistance in an air gap. To minimize detent force and maxize thrust, this paper applies the neural network to inserted core type of slotless PMLSM.

• 한국전자통신학회논문지
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• 제18권5호
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• pp.827-834
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• 2023

본 연구에서는 자동차 송풍장치용 slotless Outer Rotor BLDC 모터를 설계하고 제작하여 기존의 모터들의 단점을 개선하였다. 제안된 모터는 Brush를 제거하여 회전 시 DC 모터의 기계적 마찰에 의한 소음을 해결하고, 구조적으로 Slotless Air-Gap 권선을 사용하여 BLDC 모터 슬롯에 의해 발생되는 코깅 토크를 개선하였다. 그리고 외부 회전자에 Magnet을 부착시키고 내부 회전자와 동시에 회전하기 때문에 자속의 변화가 생기지 않아 구조적으로 철손을 원천적으로 줄여 높은 효율을 가진다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권7호
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• pp.315-322
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• 2001

High speed brushless permanent magnet(PM) machines need a key technology to minimize the iron core losses in stator and the eddy current losses in the retained sleeve and magnets caused by slotting harmonics. Thus, slotless or iron-coreless brushless PM machines have been applied for a very high rotational speed and/or the ripple-free torque. Unfortunately, slotless or coreless PM machines have lower open-circuit field than slotted and/or iron-cored types, which cause to reduce power density. Fortunately, Halbach array can generate the strong magnetic field systems without additional magnetic materials. In this paper, the 4-pole Halbach array is applied to the high speed machine and is compared with the radial magnetized PM array in field system. The iron-/air-cored stator of PM machine is constructed with/without winding slots. Open circuit magnetic fields of each type are presented from the analytical method and finite element method. Consequently, it is confirmed that the Halbach array field system with slotless stator is more suitable to the high speed motor because it has high flux density, sinusoidal flux distribution than others.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권3호
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• pp.262-266
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• 2005

In this paper, in order to enhance thrust of slotless type Permanent Magnet Linear Synchronous Motor, an optimal design is achieved by combining a genetic algorithm with 3D space harmonic method. In the case of multi-objective functions, the ratio of thrust/weight and thrust/volume are increased by $\7.56[%]l\;and\;7.98\[%]$, respectively. Thus, miniaturization and lightweight were realized at the same time.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.39-40
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• 2007

본 논문은 Slotless BLDCM의 발열특성에 고려하여 열 발생을 최소화 하고자 다중 반응표면법을 적용하여 모터의 형상 및 권선 사양의 최적 선정에 관한 연구이다. 본 연구에서는 전류밀도의 최소화를 목적함수로 하여 형상 및 권선 사양의 최적화를 실시하였다. 변수에 대한 영향도의 분석은 전자계 해석을 통한 결과값을 통하여 실시하였으며, 열적 특성을 파악하기 위해서 전자계-열계의 해석을 통해서 최적값의 열적 안정성을 파악하였다.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권1호
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• pp.20-23
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• 2004

BLDCMs are widely used in many industries. In certain specialized areas, they need to have high efficiency, high power rate and produce a low volume of noise, etc. In this study, a new type of slotless BLDCM is proposed that has no cogging torque, low iron loss and low volume as compared to commonly used BLDCMs. With a high performance magnet and coreless compact winding structure similar to those employed in linear synchronous motors, motor volume is reduced. The proposed motor has been put been through various experiments arid has demonstrated acceptable results for industry applications.