Keywords
permanent magnets
solid stator core
slitted core моментний двигун
постійні магніти
суцільне осердя статора
осердя із щілинами
How to Cite
Abstract
A three-phase slotless torque motor of axial structure with permanent magnets and a solid stator core is considered. The effect of circular slits in the core, preventing the flow of eddy currents, is investigated. It is noted that the magnetic field of the stator winding has a minimum effect on the field created by permanent magnets and it can be neglected. Two stages of the study are defined: the first is the determination of the maximum torque in a static state, and the second is the determination of losses from motional eddy currents during the movement of the stator core relative to the rotor. The field problem was solved using the software "COMSOL Multiphysics". A smooth analytical function was used to approximate the magnetisation curve of core steel. It has been demonstrated through simulation of the physical model that implementing four slits can reduce torque loss approximately by four times or increase the maximum rotational speed of the rotor by the same amount. References 8, figures 9, table 1.
References
Kireyev V.G., Akinin K.P. Features of the development of slotless brushless magnetoelectric torque motors. Pratsi Instytutu elektrodynamiky NAN Ukrainy. 2022. No 63. Pp. 31–39. DOI: https://doi.org/10.15407/publishing2022.63.031.
Paulides J.J.H., Meessen K.J., Lomonova E.A. Eddy-Current Losses in Laminated and Solid Steel Stator Back Iron in a Small Rotary Brushless Permanent-Magnet Actuator. IEEE Transactions on Magnetics. 2008. Vol. 44. No 11. Pp. 4373–4376. DOI: https://doi.org/10.1109/TMAG.2008.2001996.
Min S.G., Sarlioglu B. Advantages and Characteristic Analysis of Slotless Rotary PM Machines in Comparison With Conventional Laminated Design Using Statistical Technique. IEEE Transactions on Transportation Electrification. 2018. Vol. 4. No 2. Pp. 517–524. DOI: https://doi.org/10.1109/TTE.2018.2810230.
Jia S., Qu R., Li J., Fan X., Zhang M. Study of Direct-Drive Permanent-Magnet Synchronous Generators With Solid Rotor Back Iron and Different Windings. IEEE Transactions on Industry Applications. 2016. Vol. 52. No 2. Pp. 1369–1379. DOI: https://doi.org/10.1109/TIA.2015.2490618.
Slutskiy D., Aung S.H., Basnet S. Comparison of Axial and Radial Flux Permanent Magnet Machines. 2022 North American Power Symposium (NAPS), Salt Lake City, UT, USA, 9-11 October 2022. Pp. 1–6. DOI: https://doi.org/10.1109/NAPS56150.2022.10012265.
Friedrich L.A.J., Gysen B.L.J., Jansen J.W., Lomonova E.A. Analysis of Motional Eddy Currents in the Slitted Stator Core of an Axial-Flux Permanent-Magnet Machine. IEEE Transactions on Magnetics. 2020. Vol. 56. No 2. Pp. 1–4. DOI: https://doi.org/10.1109/TMAG.2019.2953625.
COMSOL multiphysics modeling and simulation software. URL: https://www.comsol.com/documentation (accessed at 20.08.2024).
Petukhov I. S. Estimation of the accuracy of calculation by numerical methods of the characteristics of an alternating electromagnetic field with skin effect. Tekhnichna Elektrodynamika. 1987. No 1. Pp. 20–25. (Rus)
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