An analytical, numerical and experimental study on performance characteristics in a novel Vernier permanent magnet machi
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ORIGINAL PAPER
An analytical, numerical and experimental study on performance characteristics in a novel Vernier permanent magnet machine Ali Jabbari1 · Hosein Taheri1 · Ali Asghar Ghadimi2 Received: 2 February 2020 / Accepted: 4 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Vernier permanent magnet (VPM) machines have been widely used in the last two decades due to their high torque density resulting from their magnetic gearing effect. In this paper, we present a new design of VPM machine with higher efficiency and power/weight ratio than their conventional counterparts. The proposed design is a combination of discrete-pole and hybrid-pole VPM machines, which incorporates the attractive characteristics of both types to improve the distribution of air-gap flux density and reduce construction costs. The arrangement of the magnets in the stator is spoke type, and their magnetization is peripheral. In order to determine the performance characteristics of the proposed machine, an analytical model based on the subdomain method is presented. The proposed method employs a quasi-Cartesian coordinates system to express the Laplace’s and Poisson’s equations, as well as to determine the solution for each region. Then, the solution of the equations is written in the form of hyperbolic functions and the mathematical expression of the coefficients of the equations will be simpler. To validate the proposed analytical model, a Vernier machine is designed and fabricated and the results of the experimental experiments are compared with numerical (machine simulation in finite element analysis software) and analytical results. The comparison of these results shows that the proposed model is highly accurate. Keywords Vernier permanent magnet machine · Analytical model · Numerical simulation · Experimental tests
1 Introduction With the development of permanent magnet (PM) materials and permanent magnet brushless machines, Vernier machines became the focus of attention [1]. In conventional electric drives, mechanical gearboxes are used to transfer energy from the high-speed driveshaft to the low-speed driven shaft. These gearboxes have a higher maintenance cost and a lower lifetime than electric machines. Direct drive electric motors are a good alternative to these systems, but they have large physical dimensions. Meanwhile, there are some Vernier machine topologies that are capable of producing up to 3 times the torque with respect to conventional electric machines. Therefore, they are considered a vital solution to meet the existing challenges and meet the * Ali Jabbari a‑[email protected] 1
Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak 38156‑8‑ 8849, Iran
Department of Electrical Engineering, Faculty of Engineering, Arak University, Arak 38156‑8‑ 8849, Iran
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requirements of high-speed and low-torque applications [2]. The Vernier machines have a relatively low torque ripple, acoustic noise and vibration. Therefore, due to the above advantages, Ve
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