Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Research on the Design of Slotless BLDC Motor for Concrete Vibrator

콘크리트 바이브레이터에 적용하기 위한 Slotless BLDC 모터 설계에 관한 연구

  • Kim, Young-Hun (Department of Electrical Engineering, Wonkwang University) ;
  • Jin, Chang-Sung (Department of Electrical Engineering, Wonkwang University) ;
  • Kim, Jae-Hyuck (Department of Electrical Engineering, Wonkwang University)
  • 김영훈 (원광대학교 전기공학과) ;
  • 진창성 (원광대학교 전기공학과) ;
  • 김재혁 (원광대학교 전기공학과)
  • Received : 2018.12.04
  • Accepted : 2019.03.08
  • Published : 2019.03.31
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Abstract

In this paper, the design of BLDC (brushless direct current) motors based on torque and back-EMF equations was carried out to assess the application of the motor in concrete vibrators. The air gap flux density of the motor is an important parameter because the length of the motor and the size of the diameter are given. The air gap magnetic flux density was calculated through a simplified magnetic circuit, and basic design of the shape and dimensions of the motor were then determined by carrying out experiments based on torque, back-EMF, and air magnetic flux density equations. After setting the outer and inner diameters, stack lengths, and rated speed of the motor, a detailed design was performed by simulations using the finite element method by designating the diameter and thickness of the motor as the key parameters. The final design to satisfy the target torque and the lowest THD (Total Harmonic Distortion) was carried out along with a simulation.

본 논문에서는 콘크리트 바이브레이터에 Slotless BLDC (Brush Less Direct Current) 모터를 적용하기 위해 BLDC 모터의 토크 및 역기전력 식을 기반으로 하여 설계를 한다. 모터의 길이와 직경의 사이즈가 주어져 있으므로 중요한 파라미터는 공극자속밀도이다. 자기회로의 간략화를 통하여 공극자속밀도를 계산 하였으며, 토크, 역기전력 및 공극자속밀도 식을 기반으로 기초설계를 진행하여 모터의 형상을 결정 하였다. 이후 모터의 고정자의 외경 및 내경, 스택 길이, 속도를 고정값으로 설정한 후 모터의 직경 및 두께를 변수로 지정하여 유한요소법을 이용한 시뮬레이션을 통해 상세설계를 진행하였으며, THD(Total Harmonic Distortion)값이 작으면서 목표 토크 값 이상의 형상을 설계 및 시뮬레이션을 진행하였다.

Keywords

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Fig. 1. Shape of Slotless BLDC motor

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Fig. 2. Stator winding layout

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Fig. 3. Magnetic circuit of slotless BLDC motor

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Fig. 4. Simplified magnetic circuit of slotless BLDC motor

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Fig. 5. Basic design result slotless BLDC motor shape

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Fig. 6. Back EMF(Electromotive force) result of basic design

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Fig. 7. Torque result of basic design

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Fig. 8. Detailed design result slotless BLDC motor shape

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Fig. 9. Back EMF result of detailed design

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Fig. 10. Torque result of detailed design

Table 1. Specification of motor design target

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Table 2. Simulation results

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References

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