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A novel type of partitioned stator switched flux permanent magnet (PS-SFPM) machine with either single-layer or double-layer windings is developed in this paper. The proposed PS-SFPM machines have two stators, which separately accommodate the armature windings and the PMs, and between which is the rotor made of iron pieces, while the number of stator poles with PMs may be equal or half of that with...
Partitioned stator (PS) machines employ two separate stators to accommodate armature windings and permanent magnets (PMs) respectively, alleviating the stator space conflict in stator-PM machines and hence significantly boosting the torque density. However, the PM usage volume of PS machines is relatively large and the cost is high, which is undesirable for cost sensitive applications. In this paper,...
This paper proposes two new switched flux memory machines (SFMMs) based on the concept of E-core and C-core conventional SF machines. With the proposed topologies, the torque density can be enhanced while the magnet usage can be reduced compared with their counterpart conventional SF machines. Meanwhile, since both normal PM and low coercive force PM materials are adopted, the proposed machines also...
The partitioned stator (PS) machine adopts two stators to allocate coils and permanent magnets (PMs) separately, which can increase the space for PMs and coils to boost the electromagnetic torque and to improve the thermal condition of PMs which are on the stator. In this paper, the PS switched flux PM machine and PS flux reversal PM machine are proved to inherently share the same operating principle...
In this paper, the electromagnetic performance of partitioned stator switched flux permanent magnet (PM) (PS-SFPM) machines with single- and double-layer windings are compared when the inner stator is equipped with the same number or half the number of PMs as that of the outer stator teeth. Electromagnetic performance of these PS-SFPM machines is investigated by 2-dimensional finite element analysis...
Due to the high price of rare-earth magnets, it is pertinent to develop high torque density permanent magnet (PM) machines with reduced magnet volume, which is the main purpose of this paper. This paper proposes novel high torque density magnetically-geared switched flux permanent magnet machines in which the stator is partitioned into two stators but with armature windings and PM excitations separately...
A novel biased flux permanent magnet (PM) machine (BFPMM) with doubly salient structure and PMs located in the stator back-iron is investigated in this paper. The stator is constituted by T-shaped laminated segments between which are placed circumferentially magnetized magnets of alternate polarity, and a concentrated winding is wound around each stator pole. The rotor has salient structure which...
Memory motor has been researched extensively in the last decade due to its online magnetization capability. Among many types of designs, hybrid magnet memory motor (HMMM) has highest torque density. This paper investigates the cross coupling effect of HMMM in the motor topology proposed by Sakai. The analysis model is introduced firstly. Based on the magnetic circuit model, the mechanism of open-circuit...
Based on the traditional switched flux PM machine, a novel switched flux hybrid magnet memory motor is developed in this paper, which has extra low coercive force (LCF) magnets and magnetization coils. By changing the magnetization state of LCF magnets during operation, flux enhancing and weakening can be achieved without extra copper loss. The design considerations such as stator/rotor pole combinations,...
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