International Journal of Applied Electromagnetics and Mechanics - Volume 39, issue 1-4

Authors: Choi, Myoung-Hyun | Rhyu, Se-Hyun | Kim, Byung-Taek

Article Type: Research Article

Abstract: In this paper, various effective and oscillatory torque components in a line-start permanent magnet (LSPM) motor are analyzed using the principle of superposition through the analytic approach with an equivalent circuit. According to the independent sources, in the asynchronous speed the induced rotor current and braking stator current are derived by using the DQ equivalent circuit and Laplace transformation. Then, two effective components and three oscillatory components of torque are calculated quantitatively by using the …analytic torque equations. Finally, to check usefulness of the proposed method, the current and torque characteristics are compared with finite element analysis and measurement results for various speeds. Show more

Keywords: Equivalent circuit, braking current, line-start permanent magnet, oscillatory torque

DOI: 10.3233/JAE-2012-1545

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 801-808, 2012

Authors: Park, Chan-Bae | Lee, Hyung-Woo | Lee, Byung-Song

Article Type: Research Article

Abstract: As a new concept of energy transmission systems, evolved from existing catenary and pantograph methods, Inductive Power Transformer (IPT) systems have been studied in a variety of applications in the field of railway systems recently, but there are still a lot of technical issues to resolve in order to apply an IPT system to a large system such as high-speed railway. Equivalent circuit parameters and coupling coefficients of IPTs are important design factors for high energy …transfer efficiency. This paper investigates the properties of equivalent circuit parameters and coupling coefficients of the U-U type IPT and U-I type IPT using analytical and experimental methods. Show more

Keywords: Inductive power transformer, IPT, amorphous, coupling coefficient

DOI: 10.3233/JAE-2012-1546

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 809-815, 2012

Authors: Kim, Young-Kyoun | Gu, Bon-Gwan | Rhyu, Se-Hyun | Jung, In-Soung

Article Type: Research Article

Abstract: This paper presents the design and analysis of a slotless tubular linear actuator for the ecopedal system of a vehicle. To achieve high fuel efficiency in a vehicle, the electric actuator produces a counter force to the vehicle's pedal when pressed. The actuator requires a high level of performance, such as a high force density and low detent force. In this study, the design of the slotless tubular linear actuator was optimized to satisfy these requirements. …The finite element method was used to analyze the actuator's electromagnetic properties, and the viability of the design result was verified experimentally. Show more

Keywords: Tubular actuator, slotless actuator, linear actuator, linear motor, eco-pedal system

DOI: 10.3233/JAE-2012-1547

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 817-823, 2012

Authors: Choi, Jae-Hak | Kim, Dong-Jun | Chun, Yon-do | Han, Pil-Wan | Koo, Dae-Hyun | Lee, Ju

Article Type: Research Article

Abstract: The approximate optimization based on a response surface modeling has been applied to the optimum design for obtaining flat torque of switched reluctance motor, which has high fluctuating torque due to its inherent salient structure. In order to reduce the fluctuating torque ripple causing noise and vibration, an optimization design technique has been introduced and investigated to find geometric and electric variables by means of combining finite element analysis considering driving circuits and response surface …modeling. In this research an effective optimization method based on a response surface modeling has been used to overcome the modeling noise in formulating an objective and constraint and the cumulative numerical inaccuracy. Show more

Keywords: Optimization, response surface modeling, switched reluctance motor, torque ripple

DOI: 10.3233/JAE-2012-1548

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 825-833, 2012

Authors: Li, Yan | Eerhemubayaer, Dr. | Jing, Yongteng | Sun, Xin | Yang, Shiyou

Article Type: Research Article

Abstract: The stray losses in tank walls, yoke clamps, tensile plate of core limb and other electrically conductive construction parts of a transformer are computed using three-dimensional time harmonic finite element method. The distributions of losses in the construction parts are then analyzed, and the measures of controlling and reducing stray losses were discussed. The different types of magnetic shields are investigated to reduce the eddy current loss in the tank wall and the yoke clamps. Influence …of both shielding types and dimensional parameters of a specific shield on the stray losses is discussed to fascinate engineering applications. Show more

Keywords: Power transformers, stray losses, magnetic shields

DOI: 10.3233/JAE-2012-1549

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 835-841, 2012

Authors: Jang, Jin-Soek | Lee, Jae-Kwang | Kim, Byung-Taek

Article Type: Research Article

Abstract: This paper suggests a hybrid exited Flux Switching Permanent Magnet (FSPM) motor which has flux control characteristics. First of all, the structure of FSPM with flux control characteristics is suggested and the basic principle of how it works is explained. Then, a 2D model considering an overhang is suggested in order to extract the parameters of the motor and using this, counter back-emf and inductance are calculated. Lastly, the characteristics were analyzed using voltage equation when …operating flux control. Show more

Keywords: Flux switching permanent magnet motor, hybrid excitation, overhang effect, flux control

DOI: 10.3233/JAE-2012-1550

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 843-849, 2012

Authors: Choi, Dawoon | Li, Jian | Sun, Ning | Cho, Yunhyun

Article Type: Research Article

Abstract: This paper proposes a new structure of switched reluctance generator with dual stator (DSRG) for wind turbine application. It is conducive for wind turbine system to reduce the size and weight of nacelle. Advanced performance of DSRG can be verified by comparing with general structure of prototype SRG whose performance have been verified by result from several simulations and experimental measurement. To compare two types of SRG, experiment at same condition (3 kW 12/16 SRG with …pole pitch of stator, rotor, and other dimensions) for accuracy of SRG's performance. As a result, we can reduce the weight and stack length at the same performance using DSRG so that compactness is available. In further study, Manufacture of DSRG will study and the effect of vibration and noise also study either for its structure. Show more

Keywords: Switched reluctance generator, SRG, dual stator

DOI: 10.3233/JAE-2012-1551

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 851-857, 2012

Authors: Senol, Seray | Ustun, Ozgur

Article Type: Research Article

Abstract: The paper presents a study on the design and analysis of a sub-fractional slot concentrated winding brushless direct current motor (BLDCM) with unequal tooth widths for a light electric vehicle application. This kind of brushless surface permanent magnet (SPM) motor is equipped with easy-to-manufacture features which are crucial for the electrical machinery market, especially for electric motors used in electric vehicles. The structure also responds quite effectively to field weakening operation, because of its …inherent higher inductance value. The study is focused on increasing the winding inductance value by using the designs analysed in magnetic analysis software. A selected BLDC motor structure is manufactured and tested to verify the design. Show more

Keywords: Subfractional slot concentrated winding, surface magnet BLDCM, field weakening

DOI: 10.3233/JAE-2012-1552

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 859-864, 2012

Authors: Syed, Qurban Ali Shah | You, Yong-min | Kwon, Byung-il

Article Type: Research Article

Abstract: This paper attempts to design a direct driven axial flux permanent magnet synchronous generator (AFPMSG) with better accuracy considering magnetic flux leakages and fringing effect, using D^{2} L method. Design results of conventional and improved design processes are analyzed and compared using 3D finite element method (FEM). Single and multi-stack AFPMSG topologies are designed by using an improved design process. FEM structural analysis is utilized to improve power to weight ratio of three-stack AFPMSG. …Finally characteristics of both single and three-stack AFPMSG topologies are analyzed and compared using 3D FEM analysis. Show more

Keywords: Axial flux machines, direct driven wind generators, AFPMSG topologies, flux leakages

DOI: 10.3233/JAE-2012-1553

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 865-872, 2012

Authors: Choi, Da-Woon | Li, Jian | Cho, Yun-Hyun

Article Type: Research Article

Abstract: In this paper the cost reduction design of a three-phase line start permanent magnet synchronous motor (LSPM) due to increasing price of permanent magnet recently. Cost reduction can be effectively achieved by reducing PM material through optimization of the rotor structure using the response surface method. The PM volume was decreased by about 10%, while satisfying basic performance requirements and reducing torque ripple. Prototype machines with two the rotors were built and tested. Experimental results are …compared in terms of efficiency, power factor. Show more

Keywords: Line start permanent magnet synchronous motor, response surface method

DOI: 10.3233/JAE-2012-1554

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 873-879, 2012