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Influence of Core Stress on Performance of Permanent Magnet Synchronous Motor
Haidong Cao,Surong Huang,Wenmin Shi 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
The motor core stress produced during the manufacturing process and motor operation changes the electromagnetic characteristics of the iron core. Thus, research on electromagnetic calculations under the condition of stress is one of the key challenges to achieve more efficient designs of permanent magnet motors. In this paper, the stress equations of a rotor centrifuge and stator interference assembly are studied, and the changing regularity of stress and magnetic properties of electrical steel and its causes are analyzed theoretically. A device for measuring the stress and magnetic properties of electrical steel is designed and tested. Then, a model for iron loss calculations that includes stress is proposed for improved design. The effects of stress on loss, d-q axis inductance, and torque are simulated and compared using an IPMSM as an example. The feasibility and accuracy of this method are verified by comparing the simulation and prototype test results.
고속원심분리 사이클론을 이용한 오일 미스트 제거 성능 연구
김수연,김진선,성진호,한방우,김용진,김학준,Kim, SooYeon,Kim, Jin-Seon,Sung, Jin-Ho,Han, Bangwoo,Kim, Yong-Jin,Kim, Hak-Joon 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.4
This study was performed for the application of a high-speed centrifugal cyclone to shale gas mining process. This device uses the centrifugal force to control particles similar to typical cyclones, and the disk located inside the cyclone is forced to rotate using a motor. The pressure difference occurred during the rotating of disk. Hence, inflow rate was generated without a blower fan. In addition, flow rate increased with elevating rpm of motor. The installing the disk in multiple stages on the inner rotor increased the instantaneous disk outlet flow. Hence, the control efficiency of oil particle increased from 1.05% to 31.2%. By modifying the structure of the disk so that the air flow to the opposite direction of the cyclone, the control efficiency of oil particles increased to 81.5%. By increasing the capacity of the motor and the size of the disk, the flow rate was increased to 2.5 ㎥/min because the rpm of motor and pressure difference increased. As rpm of motor increased, the cut-off diameter (d<sub>pc</sub>) became smaller. Unlike the Lapple's equation, d<sub>pc</sub> was inversely proportional to the effective number of rotations (N<sub>e</sub>). The control efficiency was maintained even if the concentration of oil particles increased, for this reason, the higher the oil concentration, the more particles were accumulated and controlled.
洪定杓(J. P. Hong),周秀元(S. W. Joo),韓聲鎭(S. C. Hahn),具大鉉(D. H. Koo) 대한전기학회 2006 전기학회논문지 B Vol.55 No.4
This paper presents characteristics of SynRM(Synchronous Reluctance Motor) that is compared with a high speed induction motor. SynRM is much suitable for high speed electric machines because of structural robustness. There are many kinds of SynRM according to the shape of rotors. Particularly, axially laminated anisotropic (ALA) rotor is suitable for high speed instruments. Characteristics of SynRM with ALA rotor is obtained from a governing voltage and torque equation mainly composed of d-axis and q-axis inductance that will be identified with finite element method.
Sung-Jin Kim,Sang-Yong Jung,Yong-Jae Kim 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
Recently, the interior permanent magnet (IPM) motors for electric vehicle (EV) traction motor are being extensively researched because of its high energy density and high efficiency. The traction motor for EV requires high power and high efficiency at the wide driving region. Therefore, it is essential to fully consider the characteristics of the motor from low speed to high-speed driving regions. Especially, when the motor is driven at high speed, a significant centrifugal force is applied to the rotor. Thus, the rotor must be stably structured and be fully endured at the critical speed. In this paper, aims to examine the characteristics of the IPM motor by adjusting the width of air-barrier according to the permanent magnet position which is critical in designing an IPM motor for EV traction motors and to conduct a centrifugal force analysis for grasping mechanical safety.
김성진,정상용,김용재 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
Recently, the interior permanent magnet (IPM) motors for electric vehicle (EV) traction motor are being extensively researched because of its high energy density and high efficiency. The traction motor for EV requires high power and high efficiency at the wide driving region. Therefore, it is essential to fully consider the characteristics of the motor from low speed to high-speed driving regions. Especially, when the motor is driven at high speed, a significant centrifugal force is applied to the rotor. Thus, the rotor must be stably structured and be fully endured at the critical speed. In this paper, aims to examine the characteristics of the IPM motor by adjusting the width of air-barrier according to the permanent magnet position which is critical in designing an IPM motor for EV traction motors and to conduct a centrifugal force analysis for grasping mechanical safety.
Kim, Sung-Jin,Jung, Sang-Yong,Kim, Yong-Jae The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
Recently, the interior permanent magnet (IPM) motors for electric vehicle (EV) traction motor are being extensively researched because of its high energy density and high efficiency. The traction motor for EV requires high power and high efficiency at the wide driving region. Therefore, it is essential to fully consider the characteristics of the motor from low speed to high-speed driving regions. Especially, when the motor is driven at high speed, a significant centrifugal force is applied to the rotor. Thus, the rotor must be stably structured and be fully endured at the critical speed. In this paper, aims to examine the characteristics of the IPM motor by adjusting the width of air-barrier according to the permanent magnet position which is critical in designing an IPM motor for EV traction motors and to conduct a centrifugal force analysis for grasping mechanical safety.
Optimization of a Centrifugal Pump for Hot Water System at Multi - Operation Points
ThaiSon Thai,Minsub Han 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We present a multi-objective optimization and design of a centrifugal pump at multiple operating conditions using brushless direct current (BLDC) motor in hot water circulation system. The goal is to minimize the energy consumption of the pump by maximizing the efficiency and total head at different working conditions. A numerical model was built to investigate the flow inside the pump and the results were validated with experimental data for the total head. To achieve the goal, the efficiencies at four working conditions and the total head at 25% workload were selected as the objective functions. The main effective design parameters were determined by sensitivity analysis using elementary effects (EE) method, and design of experiment is conducted using Latin hypercube sampling (LHS) method. Response surface methodology was employed to fit the objective function. Multi-objective optimization solution was obtained by using genetic algorithm (MOGA) and resulted in a Pareto front solution including 18 candidate points. An optimum candidate was selected from Pareto front and validated using high-fidelity model to verify the result. The new optimum design shows a significant improvement in the objective functions in comparison with the original design.
정형우(Hyeung-Woo Jeong),김동희(Dong-Hee Kim),백원식(Won-Sik Baik),김민회(Min-Huei Kim),송현직(Hyun-Jig Song) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.5
본 논문에서는 단상 유도전동기의 전자식 기동장치 개발에 관해 연구하였다. 전자식 기동장치는 콘덴서 기동형 단상 유도전동기의 보조권선 회로에 장착된 원심력 스위치를 대체하기 위해 활용된다. 개발된 전자식 기동장치는 보조권선의 전압을 관측하여 전동기가 정격속도에 가까워지면 보조권선을 전원으로부터 개방하는 역할을 수행한다. 범용 단상 유도전동기에 사용되고 있는 원심력스위치는 기계식 접점을 사용하기 때문에 접점에서 불꽃이 발생하고 전동기의 수명과 신뢰성을 저감시키는 요인이 된다. 개발된 전자식 기동장치는 무접점 반도체 스위치인 트라이악을 적용함으로써 전동기의 신뢰성과 특성이 개선될 수 있으며, 저전압 및 반복실험 등의 다양한 실험을 통해 신뢰성을 검증하였다. This paper presents a simple electronic starter for single phase induction motor (SPIM). It replaces the centrifugal switch in the auxiliary winding circuit of the capacitor start type SPIM. The electronic starter observes the auxiliary winding voltage, and disconnects the auxiliary winding when the motor gets close to its rated speed. Because of its possibly fluttering contacts of the centrifugal switch which mounted on the conventional SPIM, the reliability of SPIM can be reduced. Developed new electronic starter has no mechanical contacts. Therefore, the reliability and the performance of SPIM can be improved. The operational principle of the proposed electronic starter is explained, and illustrated with experimental results.