International Journal of Applied Electromagnetics and Mechanics - Volume 52, issue 1-2

Authors: Niguchi, Noboru | Hirata, Katsuhiro | Morimoto, Eiki | Ohno, Yuki

Article Type: Research Article

Abstract: This paper proposes a novel permanent magnet synchronous motor with switchable speed-torque (N-T) curves. The structure and operational principle of the proposed motor are described. The proposed motor can be rotated as 3-phase and 6-phase motors. First, the theoretical N-T characteristics using the torque constant and inductance that are computed by 2-D FEM analysis are calculated. Second, the 2 N-T characteristics are verified using FEM analysis under vector control. Finally, the advantages and disadvantages of the proposed motor are described.

Keywords: Permanent magnet motor, variable flux, 6-phase inverter, N-T curve, coupled analysis

DOI: 10.3233/JAE-162101

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 755-762, 2016

Authors: Nobuhara, Shugo | Hirata, Katsuhiro | Niguchi, Noboru | Ukaji, Hajime

Article Type: Research Article

Abstract: This paper proposes new-shaped pole pieces for a low-speed rotor of a magnetic-geared generator, which unify a magnetic gear and a generator and can realize downsizing and maintenance-free operation for large output power machines such as a 2-MW class used for wind power generations. The concept of the new-shaped pole pieces is described, and its effectiveness is verified by finite element analysis and measurements on a prototype downsized in 1-kW class.

Keywords: Magnetic-geared generator, fixing method, pole piece

DOI: 10.3233/JAE-162072

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 763-769, 2016

Authors: Zhao, Fei | Lin, Hai | Kwon, Byung-Il

Article Type: Research Article

Abstract: This paper presents a novel three-phase U-core stator motor with the modular topology based on the conventional single-phase motor to solve the problems of high torque ripple and non-self-starting ability, which has the similar advanced performance as a two-phase motor. Basic topology and torque analysis are discussed for the proposed three-phase motor in terms of the single-phase modules. Finite-element method (FEM) is carried out to compare and verify the competitive performance of the proposed motor and the practicability of such modular design concept. The dynamic starting performance in the proposed three-phase motor is finally simulated by utilizing the Simulink models …and compared to those of the single-phase and two-phase models. Show more

Keywords: Modular topology, PMSM, simulink models, three-phase U-core stator motor

DOI: 10.3233/JAE-162050

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 771-776, 2016

Authors: Wu, Tonghui | Xu, Minglong | Jing, Zijian | Shao, Shubao | Wu, Chengsong

Article Type: Research Article

Abstract: The piezoelectric actuator shows good control of micro linear displacement, but it cannot directly output the angular displacement. In this paper, an angular displacement piezoelectric actuator is proposed, which can amplify the displacement of the piezoelectric stack and realize angular displacement output just through one piezoelectric stack. Finite element modelling (FEM) simulations were used to analyse the angular displacement and the stress conditions. To verify the results of the FEM simulations, a prototype was manufactured and the experiments were performed. The maximum angle displacement was 0.85° when the driven voltage was 120 V.

Keywords: Precision position, angular displacement, piezoelectric actuator, rotary actuator, smart structure

DOI: 10.3233/JAE-162051

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 777-785, 2016

Authors: Zhang, Wei | Yang, Shiyou | Bai, Yanan | Huang, Jin

Article Type: Research Article

Abstract: To develop a fast global optimizer, the whole iterative procedure of a tabu search algorithm is divided into two deliberately designed phases: exploration- and exploitation-phases. Stochastic approximation method is proposed to minimize the computational burdens when computing the gradient information in designing the exploitation phase. Also, some specially oriented mechanisms for enhancing the balance between exploration and exploitation searches are introduced and integrated. Numerical results are reported to showcase the merits of the proposed metaheuristic.

Keywords: Global optimization, inverse problem, metaheuristic, tabu search

DOI: 10.3233/JAE-162124

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 787-792, 2016

Authors: Wang, Luyu | Yang, Shiyou | Huang, Jin

Article Type: Research Article

Abstract: An adaptive quantum-behaved particle swarm optimizer (AQPSO) is proposed to ensure a good balance between exploration and exploitation searches of the algorithm. In the proposed algorithm, some indicators to identify the searching states of a particular particle, the whole swarm, and the iterative process are proposed and used to design an adaptively tuning mechanism for the Contraction-Expansion Coefficient . Moreover, a partially regenerated swarm scheme is designed to select promising particles and to regenerate unpromising ones when the swarm is trapped into a local optimal point. The proposed AQPSO is used to solve the TEAM workshop benchmark problem 22, and …compared with existing QPSO. The numerical results have demonstrated that the proposed algorithm outperforms the existing QPSO, especially in view of the global search ability. Show more

Keywords: QPSO, global optimization, TEAM22

DOI: 10.3233/JAE-162058

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 793-799, 2016

Authors: Humza, Muhammad | Kim, Byungtaek

Article Type: Research Article

Abstract: The induction motor designed for the variable speed applications are different from those which are designed for constant speed applications. This paper deals with the method for the design of induction motor for variable speed applications starting from the analytical calculation of equivalent circuit parameters. Finally, the main dimensions of the motor geometries are provided by using the relation between the circuit parameters and geometries of a real induction machine. The proposed approach also minimizes the problems caused by the conventional motor design methods for the variable speed application. The effectiveness and accuracy of the proposed design can be verified …through Finite Element analysis for practical design. Show more

Keywords: Induction motor design, equivalent circuit parameters, variable speed

DOI: 10.3233/JAE-162116

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 801-808, 2016

Authors: Ando, Yoshinori | Kuroiwa, Shota | Kobori, Kazuya | Murakami, Iwanori

Article Type: Research Article

Abstract: A new type magnetic harmonic gear is proposed. The new magnetic gear has the stackable structure and is assembled easily. The proposed magnetic gear has stacked ring magnets and thin iron plates for the inner and outer rotors. And the two types of the inner and the outer rotors are compared. The proposed magnetic gears can transmit the maximum transmitted torque over 1 Nm and the input rotational speed exceeding 2000 rpm. Furthermore, the influence of a stack on the maximum transmit torque is revealed through the experiment. Also the maximum transmitted torque is checked through the simulations.

Keywords: Magnetic gear, stackable structure, magnetic flux concentration, maximum transmission torque

DOI: 10.3233/JAE-162095

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 809-816, 2016

Authors: Zhao, Wenliang | Lipo, Thomas A. | Kwon, Byung-Il

Article Type: Research Article

Abstract: This paper proposes a novel permanent magnet (PM) shape for surface-mounted PM (SPM) machines, with the aim of not only improving the sinusoidal quality of back electromotive force (EMF) and reducing cogging torque as well as torque ripple, but also saving on the magnet material cost. The proposed PM shape is designed to be trapezoidal and symmetrical in the axial direction, and the pieces from breaking the magnets for the trapezoidal shape can be used to create a new pole resulting in a significant reduction of magnet material cost. The design principle of the proposed cost-effective PM shape with two …alternatives is illustrated in detail. To highlight the advantages of the proposed PM shape in SPM machines, two conventional rectangular PM shapes and a previously reported sinusoidal PM shape are adopted for performance comparison, based on a 3-D finite element method (FEM) using JMAG-Designer. Show more

Keywords: Back electromotive force (EMF), cogging torque, cost-effective, finite element method (FEM), surface-mounted permanent magnet (SPM), machines, torque ripple

DOI: 10.3233/JAE-162119

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 817-825, 2016

Authors: Tsukiji, Tetsuhiro | Hamada, Keitaro

Article Type: Research Article

Abstract: One of an electrohydrodynamics (EHD) phenomenon is the induced flow of a functional fluid in the presence of an electric field. In this paper, we describe a small pump in which the flow is generated by such an EHD phenomenon. In the case of pumps based on cylindrical electrodes, which thus far have been the focus of our research on EHD pumps, the total circumference length of the edge of the holes in the electrode that generates the rotational flow is small, leading to a small overall one-directional flow velocity. To increase this area, we produced two different electrode pumps …in which the electrode (cylindrical; 6 mm diameter, 1 mm width) contains multiple holes. We measured the pressure-flow rate characteristics of our pumps and compared their performances. Show more

Keywords: Pump, EHD phenomenon, flow visualization, pressure, flow rate

DOI: 10.3233/JAE-162054

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 827-833, 2016