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The thermal demagnetization of the magnet by the eddy-current loss at high rotational speeds often becomes one of the major problems in the PM machines [1].
In the present, unmanned aerial vehicles (UAV) has arisen more and more attention due to the high efficiency, ease and safety in completing complex missions [1][2].
By appropriately inserting ferrite magnets into the rotor of a synchronous reluctance motor (SynRM), it is realized that the operational power factors and torque outputs of this SynRM can be improved.
This paper investigates a new direct-drive machine, which artfully integrates a permanent-magnet brushless machine (PMBM) into a magnetic gear (MG). In order to achieve the capability of low speed operation and high torque output, the PMBM and MG share the same high-speed rotor. The key of the proposed machine is to adopt the Halbach permanent-magnet (PM) arrays and employ them to compose the PM poles...
Upon the increasing attentions on energy efficiency and hence environmental protection, the development of the electric vehicles (EVs) has been accelerating [1]. Particularly, the electronic differential (ED) system has been developed to eliminate the heavy gearbox for the curvilinear movement [2]. Yet, the traditional ED system is achieved by controlling each of the wheels independently, while fatal...
By using the powder metallurgy technology and magnetic isotropy characteristic of the soft magnetic composite (SMC) material, various kinds of the complex structure permanent magnet synchronous machines (PMSMs) can be designed and fabricated easily e.g., axial-flux machine, claw pole machine (CPM) and transverse-flux machine (TFM) [1]-[4]. With the global coil applied in the CPM and TFM, the CPM and...
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