• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 하계학술대회 논문집
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• pp.448-449
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• 2010

This paper proposes a sensorless control strategy for the Interior Permanent Magnet Synchronous Motor (IPMSM) by using the parallel reduced-order Extended Kalman Filter. The sensorless control strategy is composed with two EKFs alternately computed every sampling period with a new model. The new model is based on the extended electromotive force (EEMF) which has a simple structure, making position estimation possible without approximation. The proposed strategy can save computation time and estimate rotor speed and position. To verify the merit of the proposed strategy, simulation and experimental results validate the theoretical analysis and show the feasibility of the proposed control strategy.

• 전력전자학회논문지
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• 제13권5호
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• pp.336-343
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• 2008

본 논문에서는 병렬형 칼만 필터를 사용한 영구 자석 동기 전동기의 새로운 센서리스 제어 기법이 제안되었다. 제안된 기법은 기존의 확장형 칼만 필터(EKF)와는 달리 reduced-order EKF를 이용한 역기전력 추정 알고리즘을 통해 회전자 위치와 속도를 추정할 수 있고, 각각의 샘플링 시간마다 서로 다른 EKF를 실행하는 병렬형 구조를 사용함으로써 연산시간을 월등히 줄일 수 있다. 따라서 제안된 기법은 기존 EKF의 장점은 그대로 유지하며 단점으로 지적되었던 긴 연산시간 문제를 극복하고 쇄교 자속 값에 민감한 부분도 부분적으로 해결할 수 있다. 또한 운전 영역에 따라 그 형태를 달리함으로써 회전자 속도 및 위치를 안정적으로 추정할 수 있다. 제안된 기법은 실험 결과를 통하여 그 타당성이 검증되었고, 기존 EKF와의 연산 시간 비교를 통하여 우수성이 확인되었다.

• 전력전자학회논문지
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• 제16권3호
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• pp.266-273
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• 2011

본 논문에서는 매입형 영구자석 동기 전동기(IPMSM)의 확장형 역기전력(EEMF) 모델을 이용한 저감차수 병렬형 확장형 칼만 필터(EKF)를 이용한 센서리스 제어 기법을 제안한다. 제안된 센서리스 제어 기법은 간단한 수학적 구조로 매입형 영구자석 동기전동기 구동에 적합한 확장형 역기전력 모델을 이용하여 두 개의 저감 차수 형태로 표현하였다. 이러한 두 모델은 매 샘플링 시간마다 확장형 칼만 필터에 번갈아 연산된다. 행렬의 차수를 저감하여 EKF의 연산시간의 단축과 알고리즘 구현의 부담을 줄였으며 센서리스 제어의 안정적인 상태 벡터의 추정을 위해 병렬로 구동하는 두 모델에 의해 추정된 정보를 이용하였다. 제안된 기법은 실험 결과를 통하여 안정적인 위치 추정 및 속도 추정 성능을 검증 하였으며, 전 차수 EKF와의 연산 시간 비교를 통하여 우수성을 검증하였다.

• 전력전자학회논문지
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• 제22권3호
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• pp.249-255
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• 2017

This paper presents air-gap control according to Y and Delta connections of a double-sided air-gap permanent magnet synchronous motor (DA-PMSM) with independent three-phase structure. In particular, the DA-PMSM used in this study can be applied to low-speed and high-torque applications, such as wind turbines, tidal power generations, and electric propulsion ships, because of its modular stators and a rotor with numerous permanent magnets. Unlike conventional three-phase machines, the DA-PMSM has a symmetrical configuration with double-sided air-gap. Therefore, Y/Delta winding connections and serial/parallel configurations between stator modules are possible. To identify the DA-PMSM operating characteristics, mathematical modeling is analyzed according to the Y/Delta connections. Moreover, air-gap control performances by applying the winding connection methods are verified through experimental results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.773-774
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• 2006

Nowadays, the global interests are concentrated on the preserving of the clean environment, and the diminishing of the dependence on the fossil energy, and among the possible alternative energies, the wind turbine generating system is considered to be the best suited to produce high efficiency energy, without affecting the natural environment. The permanent magnet generators were been used for the wind power generating, for long time, with continuous efforts to improve the generating efficiency. And the latest trend on it is to develop an AFPM(Axial Flux Permanent Magnet)type, which is composed in the structure of rotor and stator shaped in the disc forms, and the direction of the flux at the air gap runs in parallel to the shaft. This thesis is on the study concerning with the analysis of the characteristics of the 5 kW at 300rpm direct drive AFPM generator which is suitable for the small scale wind turbine generating system. In it, the Electro-magnetically Coreless AFPM was been analyzed, the prototype generators been made, concentrated on interpreting the characteristics of the power output, and verifying it through the theoretical study and practical tests.

• Tribology and Lubricants
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• 제34권1호
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• pp.33-41
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• 2018

This paper describes a new test rig for identification of rotordynamic force coefficients of squeeze film dampers (SFDs) in automotive turbochargers (TCs). Prior studies have mainly concentrated on relatively large-sized SFDs used in aircraft engines, turbocompressors, and turbopumps. The main objective of the current study is to propose a test rig for identification of dynamic force coefficients of small-sized SFDs (a journal diameter of ~11 mm). The current test rig consists of a journal, a SFD cartridge, four support rods, an upper structure, a data acquisition (DAQ) system, and an oil circulation unit. The annular gaps between the journal outer surface and SFD cartridge inner surface create SFD film lands. The damper has two parallel film lands separated by a central groove, having an axial length and depth of 3 mm. Each film land has a length of 4 mm with a $40{\mu}m$ radial clearance. The static load and dynamic impact tests identify the structural characteristics (i.e., stiffness and natural frequency) of the journal and assembled test rig. The measurements show good agreement with predictions. The SFD performance data from this test rig will be used to develop innovative TC rotor systems with improved NVH and reliability characteristics incorporating advanced SFD technology.