Electromagnetic Performance Analysis of Novel Flux-Regulatable Permanent Magnet Machines for Wide Constant-Power Speed Range Operation

Wang, Yunchong; Niu, Shuangxia; Fu, Weinong

doi:10.3390/en81212407

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…Many researchers have proposed structural alterations such as single stator for surface and interior permanent magnets [6,7], double stator [11][12][13][14][15][16], and double rotor [17,18]. Gieras et al [6] observed that a surface permanent magnet with a single stator generator had a low inductance value, resulting in a narrow field weakening range and a low torque-generating current.…”

Section: Introductionmentioning

confidence: 99%

Power Mapping Studies on the Coil Connection of an Interior and Embedded Permanent Magnet Double Stator Generator

Ibrahim,

Misron,

Hairulnizam

et al. 2024

PIER M

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The increased electrical demand in electrical machines promotes the improvement in power density in double stator systems. The power mapping performance and density of a novel type of interior embedded permanent magnet for a double-stator generator (IEDSG) is investigated in this work. This study investigates the basic attributes of the proposed IEDSG by analyzing various load resistances and changing rotor speeds. The Finite Element Method (FEM) is used to model the generation capabilities that consider electromagnetic properties such as flux density and flux lines. The proposed IEDSG is then manufactured and tested in a laboratory environment to assess how effectively it will perform when being paired with a load circuit. The efficiencies of two unique coil connections -series coil and independent coil -are evaluated and compared. According to the experimental results, when operating at an 800-rpm rotating speed, the independent-coil connection delivers a peak power output of 1688 W, a 16% improvement over the series-coil connection.

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Section: Introductionmentioning

confidence: 99%

Power Mapping Studies on the Coil Connection of an Interior and Embedded Permanent Magnet Double Stator Generator

Ibrahim,

Misron,

Hairulnizam

et al. 2024

PIER M

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“…In order to efficiently produce electricity, high-efficiency machines are desired. Permanent magnet (PM) machines are extensively utilized as electrical generators in renewable applications, such as hydro and wind energies, due mainly to their outstanding advantages, for instance, high power density, high torque density, high reliability, and freedom from excitation loss [1,2]. These machines can be categorized into two types, namely, the stator permanent magnet machine and the rotor permanent magnet machine, depending on the location of the installed PM [3].…”

Section: Introductionmentioning

confidence: 99%

Optimal Stator Design of Doubly Salient Permanent Magnet Generator for Enhancing the Electromagnetic Performance

et al. 2019

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An optimal stator design technique of a three-phase doubly salient permanent magnet generator (DSPMG) for improving the output power is proposed. The stator configuration was optimally designed by adjusting the stator pole depth and stator pole arc. The trapezoid outer stator tip was also designed. Then, the output characteristics of the designed DSPMG including the flux linkage, electromotive force (EMF), harmonic, cogging torque, efficiency, magnetic flux distribution and voltage regulation were characterized by using the finite element method. Results were compared to the original structure in the literature. It was found that the flux linkage, EMF, cogging torque, and efficiency of the proposed DSPMG were significantly improved after the stator pole depth and stator pole arc were suitably modified. Further details of optimal stator pole depth and stator pole arc are presented. The EMF produced by the optimal proposed structure was 47% higher than that of the conventional structure, while 56% cogging torque improvement and 20% increased efficiency were achieved. The EMF generated by the proposed structure was classified in the high-range scale compared to the other existing models. The symmetrical magnetic flux distribution of all structures was indicated. The voltage regulation of the modified structure was also significantly improved from the conventional model. The proposed design technique can be utilized to maximize the electromagnetic performance of this particular generator type.

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“…The proportion of windage losses is usually moderate, albeit not completely insignificant [5]. The electromagnetic analysis of an AFPMSM has been widely addressed [6][7][8][9][10]. For instance, several analytical models were developed to compute the iron losses accurately and in a fast way by Hemeida and Sergeant [11].…”

Section: Introductionmentioning

confidence: 99%

“…Within this framework, Coren et al [17] presented experimental data for the windage losses associated with a rotating disk in a rotor-stator cavity with a superimposed throughflow of air at high rotational Reynolds numbers up to the range of Re = 10 7 .…”

Section: Introductionmentioning

confidence: 99%

Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets

2016

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Abstract:In this paper, a set of correlations for the windage power losses in a 4 kW axial flux permanent magnet synchronous machine (AFPMSM) is presented. In order to have an efficient machine, it is necessary to optimize the total electromagnetic and mechanical losses. Therefore, fast equations are needed to estimate the windage power losses of the machine. The geometry consists of an open rotor-stator with sixteen magnets at the periphery of the rotor with an annular opening in the entire disk. Air can flow in a channel being formed between the magnets and in a small gap region between the magnets and the stator surface. To construct the correlations, computational fluid dynamics (CFD) simulations through the frozen rotor (FR) method are performed at the practical ranges of the geometrical parameters, namely the gap size distance, the rotational speed of the rotor, the magnet thickness and the magnet angle. Thereafter, two categories of formulations are defined to make the windage losses dimensionless based on whether the losses are mainly due to the viscous forces or the pressure forces. At the end, the correlations can be achieved via curve fittings from the numerical data. The results reveal that the pressure forces are responsible for the windage losses for the side surfaces in the air-channel, whereas for the surfaces facing the stator surface in the gap, the viscous forces mainly contribute to the windage losses. Additionally, the results of the parametric study demonstrate that the overall windage losses in the machine escalate with an increase in either the rotational Reynolds number or the magnet thickness ratio. By contrast, the windage losses decrease once the magnet angle ratio enlarges. Moreover, it can be concluded that the proposed correlations are very useful tools in the design and optimizations of this type of electrical machine.

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Electromagnetic Performance Analysis of Novel Flux-Regulatable Permanent Magnet Machines for Wide Constant-Power Speed Range Operation

Cited by 9 publications

References 21 publications

Power Mapping Studies on the Coil Connection of an Interior and Embedded Permanent Magnet Double Stator Generator

Power Mapping Studies on the Coil Connection of an Interior and Embedded Permanent Magnet Double Stator Generator

Optimal Stator Design of Doubly Salient Permanent Magnet Generator for Enhancing the Electromagnetic Performance

Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets

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