Influence of Rotor Magnet Shapes on Performance of Axial Flux Permanent Magnet Machines

Kumar, Prerna; Srivastava, R. K.

doi:10.2528/pierc18041909

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…The minimization of the cogging torque and the maximization of the back-EMF are the objective functions. The objective functions, constraints, and limits of the variables are described in (10), (11), and (12), respectively.…”

Section: Optimized Model Results and Discussionmentioning

confidence: 99%

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Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

et al. 2021

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In this paper, a hexagonal magnet shape is proposed to have an arc profile capable of reducing torque ripples resulting from cogging torque in a single-sided axial flux permanent magnet (AFPM) machine. The arc-shaped permanent magnet increases the air-gap length effectively and makes the flux of the air-gap more sinusoidal, which decreases air-gap flux density and hence causes a reduction in cogging torque. Cogging torque is the basic source of vibration, along with the noise in PM machines, since it is the main cause of torque ripples. Cogging torque is independent of the load current and is proportional to the air-gap flux and the reluctance variation. Three-dimensional finite element analysis (FEA) is used in the JMAG-Designer to analyze the performance of the conventional and proposed hexagonal-shaped PM AFPM machines. The proposed shape is designed to reduce cogging torque, and the voltage remains the same as compared to the conventional hexagonal-shaped PM machine. Further, optimization is performed by utilizing an asymmetric overhang. Latin hypercube sampling (LHS) is used to create samples, the kriging method is applied to approximate the model, and a genetic algorithm is applied to obtain the optimum parameters of the machine.

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Section: Optimized Model Results and Discussionmentioning

confidence: 99%

“…In PM machine design, cogging torque is a concern since it adds undesirable harmonics to torque. There are various techniques that exist to overcome cogging torque [11,12]. Skewing is the simplest, most common, and most effective technique used in PM machines to decrease the cogging torque.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

et al. 2021

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“…Of the many permanent magnet synchronous machine rotor shapes used and described in the literature [23][24][25][26][27][28], eight were selected for analysis. The selected variants have both surface-mounted magnets and latent magnets.…”

Section: Rotor Designmentioning

confidence: 99%

Selecting the Best Permanent Magnet Synchronous Machine Design for Use in a Small Wind Turbine

Lefik,

Firych-Nowacka,

Lipian

et al. 2024

Electronics

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The article describes the selection of a permanent magnet synchronous machine design that could be implemented in a small wind turbine designed by the GUST student organization together with researchers working at the Technical University of Lodz. Based on measurements of the characteristics of available machines, eight initial designs of machines with different rotor designs were proposed. The size of the stator, the number of pairs of poles, and the dimensions of the magnets were used as initial parameters of the designed machines. The analysis was carried out about the K-index, the so-called index of benefits. The idea was to make the selected design as efficient as possible while keeping production costs and manufacturing time low. This paper describes how to select the best design of a permanent magnet synchronous generator intended to work with a small wind turbine. All generator parameters were selected keeping in mind the competition requirements, as the designed generator will be used in the author’s wind turbine. Based on the determined characteristics of the generator variants and the value of the K-index, a generator with a latent magnet rotor was selected as the best solution. The aforementioned K-index is a proprietary concept developed for the selection of the most suitable generator design. This paper did not use optimization methods; the analysis was only supported by the K-index.

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“…The optimal model was selected by analyzing the no-load line voltage and load torque and loss for each rotor type. In addition, the torque ripple analysis according to the change in shape described in the previous paper was referred to [17][18][19][20][21][22]. Based on the referenced contents, the torque ripple of each final model was analyzed.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Improvement of Power Density of Axial Flux Motors for Collaborative Robot Joints through Same-Direction Skew

et al. 2023

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Axial flux motors have a large output density with a large outer diameter of the motor and a short axial length. Since it is advantageous in short axial length, the axial thickness of motor components becomes a very important parameter when designing axial flux motors. Among the components, the back yoke exists to serve as a path for magnetic flux and must have a certain thickness to prevent magnetic saturation. However, as the thickness of the back yoke increases within the axial size limit of the motor, the output of the motor may decrease. In this paper, same-direction skew that increases the cross-sectional area of the magnetic flux path without increasing the thickness of the back yoke is presented. Same-direction skew is a way to increase the cross-sectional area of the back yoke by skewing the rotor and stator in the same direction. The back yoke thickness that can be reduced by same-direction skew was calculated. Performance with same-direction skew designed using the equations was analyzed and compared, and the effectiveness of each type of rotor was verified. The validity of the proposed model was examined using the finite element analysis method.

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Influence of Rotor Magnet Shapes on Performance of Axial Flux Permanent Magnet Machines

Cited by 8 publications

References 9 publications

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

Selecting the Best Permanent Magnet Synchronous Machine Design for Use in a Small Wind Turbine

A Study on the Improvement of Power Density of Axial Flux Motors for Collaborative Robot Joints through Same-Direction Skew

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