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icemd2023
Analysis of a Novel L-Type Outer-Rotor Consequent-Pole Machine
نویسندگان :
Mohammadreza Naeimi
1
Karim Abbaszadeh
2
Johan Gyselinck
3
1- K. N. Toosi university of technology, Department of Electrical Engineering
2- K. N. Toosi university of technology, Department of Electrical Engineering
3- Université Libre de Bruxelles, Department of Electro and Mechanical Systems
کلمات کلیدی :
L-type rotor،consequent-pole machine،iron pole،PM arrangement،magnetic circuit model
چکیده :
Recently, consequent-pole permanent magnet (CPM) machines have been widely utilized in various cost-sensitive applications due to their high permanent magnet (PM) utilization. However, CPM machines exhibit high torque ripple and asymmetrical back Electro Motive Force (EMF) voltage due to asymmetrical air gap flux density resulting from using PMs with the same polarity. So, the paper presents a new L-type modular outer-rotor consequent-pole permanent magnet machine (LMOCPM) with different PM and iron pole sequences to improve electromagnetic performance. To achieve the dual objective of reducing PM and rotor core volume, a new structure for the PM machine has been developed by combining the modular rotor with the CPM concept. On the other hand, the proposed structure has resulted in rotor loss reduction and high PM utilization in machines. Firstly, the three different PM arrangement topologies with various N, S, and iron poles are offered for the proposed LMOCPM machine. Then, the magnetic circuit model is used to investigate LMOCPM and modular surface-mounted PM (MSPM) machines, demonstrating the benefits of modular structures with unipolar PMs. The electromagnetic performance of the proposed machines is analyzed using Finite Element Method (FEM), including air gap flux density, flux linkage, cogging torque, and on-load torque. According to the results, the LMOCPM machines use 39% less PM material than MSPM, while the average torque remains nearly unchanged in LMOCPM1 and LMOCPM2 machines compared to the MSPM machine. As a result, the PM utilization ratio is boosted by 61%. Furthermore, the torque ripples of the LMOCPM1 and LMOCPM2 machines drop dramatically to 15.7% and 14.1%, respectively, while the MSPM machine has a torque ripple of 23.2%.
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