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Keywords = PM symmetrical segment

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22 pages, 19394 KB  
Article
Modelling of Spatial Harmonic Interactions in a Modular PM Generator
by Tomasz Węgiel and Dariusz Borkowski
Energies 2025, 18(16), 4297; https://doi.org/10.3390/en18164297 - 12 Aug 2025
Viewed by 457
Abstract
This study analyses the spatial harmonic interactions of the magnetic field with winding currents for a modular PM generator (MPMG) in steady-state operation. We created MPMG mathematical model in which we applied the harmonic balance method (HBM) to an unusual stator winding connection [...] Read more.
This study analyses the spatial harmonic interactions of the magnetic field with winding currents for a modular PM generator (MPMG) in steady-state operation. We created MPMG mathematical model in which we applied the harmonic balance method (HBM) to an unusual stator winding connection involving parallel path configurations. A star or delta stator winding configuration with two winding paths connected in parallel or in series was introduced. In this way, we obtained four different winding diagrams. However, this approach required some systematization of the analytical model. Using transformations to symmetrical components helped us to make some simplifications of the model, especially for the symmetry of load. We used the proposed model to verify the numerical calculations by performing measurements on a laboratory test stand for a single segment. We performed comparative analyses of the measurement results of the generator-phase currents for four characteristic cases of the stator winding reconfiguration, and the calculations verified the ideal qualitative convergences and satisfactory quantitative convergences. Full article
(This article belongs to the Special Issue Advances in Permanent Magnet Synchronous Generator)
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18 pages, 6712 KB  
Article
The Effects of Permanent Magnet Segmentations on Electromagnetic Performance in Ironless Brushless DC Motors
by Fugang Zhai, Liu Yang, Wenqi Fu, Haisheng Tong and Tianyu Zhao
Energies 2022, 15(2), 621; https://doi.org/10.3390/en15020621 - 16 Jan 2022
Cited by 3 | Viewed by 2432
Abstract
This paper investigates the electromagnetic torque by considering back electromagnetic force (back-EMF) trapezoidal degrees of ironless brushless DC (BLDC) motors through the two-dimensional finite element method (2-D FEM). First, the change percentages of the electromagnetic torque with back-EMF trapezoidal degrees, relative to those [...] Read more.
This paper investigates the electromagnetic torque by considering back electromagnetic force (back-EMF) trapezoidal degrees of ironless brushless DC (BLDC) motors through the two-dimensional finite element method (2-D FEM). First, the change percentages of the electromagnetic torque with back-EMF trapezoidal degrees, relative to those of PMs without segments, are investigated on the premise of the same back-EMF amplitude. It is found that both PM symmetrically and asymmetrically segmented types influence back-EMF trapezoidal degrees. Second, the corresponding electromagnetic torque, relative to that of PMs without segments, is studied in detail. The results show that the electromagnetic torque can be improved or deteriorated depending on whether the back-EMF trapezoidal degree is lower or higher than that of PMs without segments. Additionally, the electromagnetic torque can easily be improved by increasing the number of PMs’ symmetrical segments. In addition, the electromagnetic torque in PMs with asymmetrical segments is always higher than that of PMs without segments. Finally, two ironless PM BLDC motors with PMs symmetrically segmented into three segments and without segments are manufactured and tested. The experimental results show good agreement with those of the 2-D FEM method. This approach provides significant guidelines to electromagnetic torque improvement without much increase in manufacturing costs and process complexity. Full article
(This article belongs to the Special Issue Advanced Electrical Machine Design and Optimization)
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