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This study covers the investigation into the reduction of rare-earth magnets in a permanent magnet (PM) machine via the use of multiple rotors to enable a PM generator to be comprised of mixed magnetic elements, hereafter referred to as MME, by substituting ferrite materials into some rotors. The particular machine covered in this paper featured fo...
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Citations
... However, the main drawback of using Halbach PMs is high PM consumption since torque per PM volume is lower compared to the conventional PM array [36]. In [38], PM cost reduction is perused for a multistage AFPM. The AFPM consists of three stator disks and four rotor disks. ...
Axial flux permanent magnet machines (AFPMs) are potential candidates for direct‐drive wind turbines (DDWTs) due to offering high value of torque density. In slotless AFPM topologies, the cogging torque is absent which makes them more suitable for DDWTs, which provides an easier turbine start‐up. In this research, a robust design and optimisation procedure of a slotless double‐sided AFPM is discussed. The non‐linear magnetic equivalent circuit is established and the optimisation is performed by the response surface methodology to achieve a cost‐effective generator with high power density value. The generator is prototyped and the test results are presented comparing them with the numerical study and non‐optimised design results. To minimise the AFPM torque ripple which is necessary for DDWT application, a cost‐effective solution is proposed leading to a dramatic improvement in the AFPM torque ripple without reducing the average torque.
