• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.2
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• pp.134-143
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• 2016

This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.210-212
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• 2005

최근 급속도로 발전하고 있는 산업분야에서 요구되는 서보 시스템에서 빠른 응답특성, 고도의 정밀성 그리고 안전성에 대한 요구가 커지고 있는 실정이다. 본 논문에서는 이러한 요구에 따라 5상 IPM(Five-phase IPM)의 DTC(Direct torque control)에 대해 고찰하였으며, Texas Instruments사에서 전동기 제어 전용으로 개발된 DSP칩인 TMS320F2812를 이용하여 디지털적으로 제어 알고리즘을 구성하였다. 5상 전동기는 현재 산업현장에서 일반적으로 널리 사용되고 있는 삼상 전동기에 비해 안정성이 높고, 상당 전압의 변화 없이 고정자 전류를 줄일 수 있고, 토크 맥동의 주파수를 높이고 결과적으로 토크의 크기를 감소시킬 수 있다는 여러 가지 장점을 가지고 있으며, 특히 안정성을 요구하는 항공기(Aerospace applications), 전기자동차 및 하이브리드 자동차(Electric or hybrid vehicles)등의 특수한 영역에서 요구가 계속 증가되고 있다. 따라서 본 논문에서는 5상 IPM의 DTC에 대한 특성을 실험을 통하여 확인하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.835-836
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• 2015

본 논문에서는 IPM type 전동기의 구동 방식에 따른 진동 특성을 비교, 분석하였다. BLDC 구동 방식은 2상에만 전원이 인가되므로 Commutation torque ripple 및 가진력의 불평형이 발생하여 기계손이 증가하고 진동, 소음이 크게 되어 효율이 떨어지므로 3상 구동 방식과 BLDC 구동방식에 따른 진동 및 출력 특성을 비교, 검토하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.896-897
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• 2015

본 논문에서는 IPM type BLDC 전동기의 진동 저감 방안에 대해서 연구하였다. 전자기적 진동 발생원 중 주된 요인이 되는 코깅 토크와 반경방향 힘의 불평형에 대해서 노치를 설치하여 코깅토크를 최소화한 모델과 반경반향의 힘인 가진력을 평형화한 모델의 설계를 수행하였다. 각 모델에 대한 주파수별 진동원을 분석하고 진동 실험의 결과와 비교하여 분석하여 그 타당성을 입증하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.62 no.11
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• pp.1535-1540
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• 2013

In this paper, the Radial Magnetic Force(RMF) and cogging torque which cause vibration and noise in IPM type BLDC motor were analyzed. The cogging torque and RMF cause electromagnetic vibration. So, a notch was installed for the equilibrium of RMF and cogging torque reduction. The notch was analyzed by using a Fourier Series for the energy distribution of the air-gap. The equilibrium of RMF and the reduction of cogging torque were performed by a Design Of Experiment(DOE) with the notch. Also, operating characteristics and efficiency were analyzed and compared.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.158-160
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• 2006

The structure of interior permanent magnet type brushless DC motor (IPM type BLDC motor) has high saliency ratios that produce additional reluctance torque. But this structure has a significant cogging torque that may cause acoustic noise and vibration. In this paper describes an optimization of flux barrier in order to reduce cogging torque and torque ripple in IPM type BLDC motor using the Taguchi methods. The optimal design consider- ed noises such as manufacturing tolerances of permanent magnet size. So, optimal design ensures that torque performance is insensitive to noise.

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.38-40
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• 2008

This paper presents the torque ripple and vibration characteristic of interior type permanent magnet (IPM) motor according to rotor design. In the design methods, the optimal notchs are put on the rotor pole face, which have an effect on variation of permanent magnet (PM) shape or residual flux density of PM. Through the space harmonics field analysis, the positions of notch are found and the optimal shapes of notch are decided by using Finite Element Method (FEM). The validity of the proposed method is confirmed with experiments. Therefore, the vibration, starting current and efficiency of IPM is measured by experiment.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1996.04a
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• pp.236-236
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• 1996

DA-1131은 IPM이 D2 channel 특이적인 세포외막투과성을 나타내는 것과는 달리 D2 channel 이외에 azthreonam 투과경로도 이용하는 것으로 확인되었다. IPM 감수성 및 내성인 P aeruginosa 균주들에 대하여 $\beta$-lactamase의 inducible activity, hydrolytic susceptibility, affinity를 측정한 결과, Inducible activity는 DA-1131, PPM 및 MEPM이 거의 동일하였으며, 3가지 약물 모두 가수분해에 대한 안정성을 나타내었다. 그러나 $\beta$-lactamase에 대한 affinity는 IPM이 가장 컸고, MEPM, DA-1131의 순으로 감소하였다. DA-1131은 P8P2와 PBP3를 동시에 저해하며, IPM은 PBP2의 저해 후 순차적으로 PBP3를 저해하였고 이러한 시험결과는 PBPs blinding pattern과 밀접한 관계가 있는 것으로 알려진 균형태변화로도 확인되었다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.3
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• pp.519-523
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• 2007

In this paper, we propose a precise parameter extraction of interior permanent magnet (IPM) motors based on finite element analysis. For the calculation of the two-axis inductances Ld and Lq, the slotting effect and cross magnetization due to torque angle are considered. It is examined that back electro-motive force (BEMF) constant is affected by the magnetic saturation in different ways dependent on motor types. Numerical analyses and some measurements are performed for a spoke type and a flux barrier type IPM motors

• Conservation Science in Museum
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• v.8
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• pp.25-30
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• 2007

One of the most important reasons why the method of IPM(Integrated pest management) was introduced to the museum is to prevent the damages by insects in the more efficient, economic and safer way. First, through monitoring the insects, the distribution, kinds, condition and inflow path of the insects should be confirmed, and then the safe and rational methods of prevention and elimination should be found in order to take more appropriate measures against them.