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Design and Analysis of Coreless Permanent Magnet DC Motor

Amir Hossein Koushki | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 57172 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Gheidari, Zahra
  7. Abstract:
  8. In today's world, the increasing need of various industries for electric machines with low weight, high efficiency, small dimensions, and high acceleration, has caused the structure and winding of conventional electric machines to undergo optimization and changes. The removal of the iron or ferromagnet core in electric machines has made the mentioned features attainable in a coreless machine. Therefore, in recent decades, coreless machines have received much attention and become popular. By removing the ferromagnetic core out of the winding structure of the stator or rotor of an electric machine, new considerations and discussions have been created about coreless machines, and many research have been done on these machines structure, which include different types of conventional electric machines. But most of these researches are related to axial-flux or disk types of coreless machines and less attention has been paid to radial or cylindrical flux machines, especially the rotor coreless winding of these machines. One of the most obvious types of machines with coreless rotor winding is the brushed dc coreless machine, which has many applications in today's advanced industries. Therefore, in this research, the effects of the effective parameters on the performance of a permanent magnet brushed DC coreless machine have been investigated using finite element analysis, and some relationships have been obtained to estimate the performance of this machine with the help of the 3D finite element method. Then, the results out of these relationships are compared to the simulation results of finite element analysis software and their correctness and accuracy is confirmed. In the following, these relations are used in a presented hybrid model which can obtain the results with high accuracy and in much less time in comparison with finite element analysis method simulation. At the end, an available brushed PMDC coreless machine with a rhombic winding has been used for experimental verification
  9. Keywords:
  10. Permanent Magnet Machine ; Permanent Magnet Direct Current Motors ; Slotless Machine ; Coreless Machines ; Coreless Winding ; Hexagonal Winding ; Rhombus Winding ; Diagonal Winding ; Finite Element Method

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