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Due to high torque density, low torque ripple, high efficiency, excellent fault-tolerance capability and convenient manufacturing, fraction-slot concentrated windings (FSCWs) are desirable to be used in high performance permanent magnet (PM) synchronous machines.
Vernier Permanent-magnet machine (VPMM) has been recognized in recent years as a substitute for permanent magnet synchronous machines (PMSM) in direct-drive applications such as wind turbine generators, motorcycles and electric vehicle/hybrid electric vehicle (EV/HEV) [1].
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.
Low-speed direct-drive gearless machines are highly desirable for electric vehicle/hybrid electric vehicle (EV/HEV) propulsion due to the elimination of the associated gear wear, oil maintenance and acoustic problems. Conventional gearless direct-drive permanent magnet (PM) machines generally suffer from heavy weight, structural bulkiness, and lubrication problems. Due to the “magnetic-gearing” effect,...
Transverse flux permanent magnet generator (TFPMG) has attracted a great attention for the large torque and high efficiency at low speed, as well as the prominent capability of carrying considerable pole numbers [1]. Many new TFPMGs with attractive structures have been proposed such as a novel flux switching transverse flux PM generator (FS-TFPMG) presented to improve the stator space utilization...
Transverse flux permanent magnet generator (TFPMG) is especially suitable for wind power application for the merits of large pole numbers, decoupled magnetic circuit, and high power density. The distinguishing feature of TFPMG is the magnetic flux existed in three-dimensional space and three-dimensional finite element method (3-D FEM) is employed to analyze its characteristics. Such as flux-switching...
The current unbalance produced by the EAF operations may induce the torsional vibrations on shafts of a small scale steam turbine generator nearby. The vibrations might not be ignored due to that the unbalance is severe and sustained. What's even worse, the vibrations might be significant if there are any vibration modes which frequencies are closed to the double system frequency. In this paper, turbine...
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