• Journal of Magnetics
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• 제15권1호
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• pp.36-39
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• 2010

The multi-degrees of freedom surface permanent-magnet motor (Multi-D.O.F. SPM) has several degrees of freedom operations that are defined as the "roll", "yaw", and "pitch". Normally, the torque that is generated to rotate a rotor includes ripples. The analysis of the torque ripples is important for improving motor performance. In terms of the electric analysis, torque ripple occurs as a result of many factors, including the rotor and stator structures, the distribution of the air-gap flux density, and the waveform of the current in the coils. In particular, the torque ripple is an important factor in the stable operation of the Multi-D.O.F. SPM. Therefore, in this work, the torque ripple was analyzed using various types of magnetization for the permanent magnet. An improved model was proposed for the Multi-D.O.F. SPM based on this analysis.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 춘계학술대회 논문집
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• pp.321-326
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• 2013

This paper investigates the magnetic excitation force of a surface-mounted permanent magnet (SPM) motor according to the change of pole/slot combination. The characteristics of magnetic flux and radial magnetic force (RMF) due to pole/slot combination were analyzed by using magnetic circuit analysis. Also, the RMF of motors with the variable pole/slot combination was numerically simulated by using the finite element analysis to verify the result of the magnetic circuit analysis. This research shows that RMF ripple is reduced when the number of pole is smaller than the number of slot.

• 한국인터넷방송통신학회논문지
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• 제21권3호
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• pp.137-142
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• 2021

최근에는 회전자에 희토류 영구자석을 삽입하여 높은 효율과 출력밀도를 얻을 수 있는 매입형 영구자석 (IPM: Interior Permanent Magnet) 전동기 또는 표면부착형 영구자석 (SPM : Surface Permanent Magnet) 전동기처럼 영구자석이 사용된 전동기의 연구가 활발히 이루어지고 있다. 영구자석을 사용하기 때문에 릴럭턴스 전동기나 유도전동기와 비교해 효율이 높고 출력밀도가 높은 장점이 있으나 회전자에 영구자석을 삽입함으로써 고속운전 및 영구자석의 감자로 인한 신뢰성 감소, 희토류 금속의 원가 상승 등이 문제시되고 있다. 본 논문에서는 희토류 영구자석 전동기를 대체할 수 있는 미래기술 개발과, 희토류 저감형 전동기와 탈 희토류 전동기의 기술 선점을 요구하는 시대적 이슈(Issue)에 맞춰 영구자석이 필요 없는 스위치드 릴럭턴스 전동기 (Switched Reluvtance Motor, SRM)를 구동시키기 위한 구동 제어에 연구하고자 한다. PSIM 시뮬레이션 프로그램에서 제공하는 3상 SRM library를 이용하여 회전자 위치 정보 센서를 이용한 SRM의 구동 및 제어 시스템 모델링 (Modeling)을 연구하고자 한다.

• 전기학회논문지
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• 제60권4호
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• pp.759-765
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• 2011

This paper proposes an effective assistant model for considering the stator slot-opening effect on air gap flux density distribution in conventional interior-type permanent magnet (IPM) motor. Different from the conventional slot-opening effect analysis in surface-type PM (SPM) motor, a composite effect of slot-opening uniquely existing in IPM motor, which additionally causes enhancement of air gap flux density due to magnet flux path distortion in iron core between the buried PM and rotor surface. This phenomenon is represented by a proposed assistant model, which simply deals with this additional effect by modifying magnetic pole-arc using an effective method. The validity of this proposed analytical model is applied to predict the air gap flux density distribution in an IPM motor model and confirmed by finite element method (FEM).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1027-1028
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• 2007

In this paper, the variation of air-gap field intensity caused by the slot-opening in interior permanent magnet (IPM) motor is investigated, which is for predicting the instantaneous magnetic field more preciously in analytical method further. It is different with the approach of dealing the slot-opening effect on the air-gap field distribution with the "relative permeance" function in surface permanent magnet (SPM) motor. The prediction of the air-gap field in IPM motor is much more complex than SPM motor. In this study, an approximate estimation method is adopted based on analyzing the changing of flux path in both the IPM rotor part and stator part, and in additional an analytical function defined as "relative pole-arc" is built. The finite element method(FEM) is used for confirming the slot-opening effect on the field prediction.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권1호
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• pp.1-8
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• 2006

Now a day, owing to high efficiency and easy speed control of brushless DC(BLDC) motor, the demand of BLDC motor that has high power and low noises are increasing. Especially demand of interior permanent magnet(IPM) BLOC with high efficiency and high power in electric motion vehicle is increasing. IPM BLDC motor has permanent magnets in the rotor. Because it has two different flux paths, magnetic reluctance differences are generated in d-axis and q-axis. As the result of the inductance differences that are generated by the saliency(magnetic reluctance differences) in the rotor, the motor has structure advantage that has the additional reluctance torque except a magnet torque and because magnet is situated inside the rotor, the mechanical structure is strong. Therefore IPM BLDC motor makes possible to have high speed and high power. This paper presents a design and characteristics analysis of IPM BLDC motor for electric vehicle. To design IPM BLDC motor, surface mounted permanent magnet(SPM) BLDC motor is used as the initial design model. According to the shape-ratio() of permanent magnet, the characteristic of IPM BLDC motor is analyzed by Finite element method (FEM). Characteristics analysis results of the designed motor are compared with the experimental results.

• 조명전기설비학회논문지
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• 제24권8호
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• pp.27-31
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• 2010

EPS(Elctrical Power Steering)에서 전동기의 토크 리플은 조향장치의 진동 문제를 야기한다. 따라서 EPS에서 전동기의 토크 리플 저감은 중요한 문제이며, 본 논문에서는 EPS에서 사용하는 표면부착형 영구자석 동기전동기의 토크 리플 저감에 대해 논하였다. 유한요소법을 이용하여 영구자석과 고정자 슈의 형상 변화를 통해 역기전력을 분석하였으며 이를 바탕으로 토크 리플 저감 방안을 제시하였다.

• 한국정보통신학회논문지
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• 제13권3호
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• pp.514-521
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• 2009

영구자석 매입형 동기 전동기(IPM : Interior-mounted Permanent Magnet Motor)의 전류제어는 릴럭턴스에 의존하는 최대토크 특성 때문에 표면부착형 동기전동기(SPM : Surface-mounted Permanent Magnet Motor)보다 더 복잡하다. 그러므로 고성능 토크제어를 위해서는 d축 전류와 q축 전류의 상태 디커플링이 필요하다. 하지만 상태들 사이에 영향을 미치는 인덕턴스의 변화 때문에 상태 디커플링이 어렵다. 그러므로 이 변화에 대처할 수 있는 상태 디커플링 방법의 개발이 필요하며 이를 이용한 전류의 독립제어가 필요하다. 본 논문에서는 IPM모터 에 대하여 가상 상태를 갖는 슬라이딩 모드 제어를 이용하여 상태 디커플링이 가능한 접근법을 제안한다. 제안된 슬라이딩 평면은 의란과 불확실성이 존재하더라도 PI 전류 제어기에 의해서 제어되는 공칭 시스템의 동특성을 가질 수 있다.

• 한국자동차공학회논문집
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• 제16권3호
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• pp.44-51
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• 2008

The performance design and analysis of an electric motor for vehicles is very complicated due to the variety of parameters. This paper presents the design of the BLDC motor for electric air compressor in high voltage(42V) system and compares with the characteristics of IPM, SPM type BLDC motor. Futher, optimal design for the electric motor has been carried out using Equivalent Magnetic Circuit and FEM Modelling. By analyzing the design results, it is found that design parameters for BLDC motor provided an useful tool for vehicles motor design.

• Journal of Magnetics
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• 제19권1호
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• pp.84-89
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• 2014

This paper presents an analytical prediction and experimental verification of the electromagnetic performance of a parallel magnetized surface-mounted permanent magnet (SPM) motor having a fractional number of slots per pole combination. On the basis of a two-dimensional (2-D) polar coordinate system and a magnetic vector potential, analytical solutions for flux density produced by the permanent magnets (PMs) and stator windings are derived. Then, analytical solutions for back-electromotive force (emf) and electromagnetic torque are derived from these field solutions. The analytical results are thoroughly validated with 2-D nonlinear finite element (FE) analysis results. Finally, the experimental back-emf and electromagnetic torque measurements are presented to test the validity of the analysis.