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In this paper, a comparison on the on-load performance, such as on-load back EMFs, inductances, on-load cogging torques, torque, torque ripples, and iron losses, amongst the interior permanent magnet (IPM) machines having different slot/pole number (Ns/2p) combinations (Ns±2=2p, Ns±1=2p, Ns/2p=3/2 or 3/4, and Ns/2p=integer) is carried out considering local magnetic saturation. It...
Tooth-tip local magnetic saturation can be significant in surface-mount PM (SPM) machines. In this paper, the influence of tooth-tip local magnetic saturation on the on-load iron and PM eddy current losses is comprehensively investigated in SPM machines having different slot/pole number combinations (Ns±2=2p, Ns±1=2p, Ns/2p=3/2 or 3/4, and Ns/2p=integer). It is found that due to...
The on-load voltage distortion in interior permanent magnet (IPM) machine refers to the terminal voltage distorted by armature reaction. In this paper, the mechanism of the on-load voltage distortion have been investigated with the aid of frozen permeability method based on both fractional and integer slot IPM machines. It reveals that the local magnetic saturation caused by armature reaction will...
In designing the fractional slot surface-mounted permanent magnet (SPM) machines for servo and direct-drive applications, the cogging torque and on-load torque ripple are both major design considerations. Nevertheless, since the torque ripple depends on load conditions, the optimal tooth-tip design for the smallest cogging torque may not be the same for the smallest torque ripple as well. Usually...
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...
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...
Novel stator permanent magnet synchronous machines (SPMSMs) which adopt doubly salient stator and rotor structure and non-overlapping winding are investigated in this paper. Several new SPMSMs topologies are developed, including magnets in the stator poles and on the stator pole surface, respectively. It shows that amongst various SPMSMs, the surface-mounted SPMSM exhibits higher torque density, lower...
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...
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