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Salient pole wound field synchronous machines (WFSMs) are widely used for various electric power generation, such as hydro and wind generators [1], because there is free of permanent magnet and it can be directly controlled by the DC winding.
The use of small ultra-high speed rotating machines has been an area of interest for emerging applications such as machining spindles, dental drills, compressors and turbochargers, as well as portable power generation and energy storage systems [1]. Such machines are being designed to operate at speeds reaching as much as one-million revolutions per minute (rpm) [2]. At such a high speed, a slotless...
Recently, the demand for developing high performance electric machines which are free of rare earth magnets are becoming more and more attractive since the raw materials in the rare earth magnets suffer the challenge of increased price and limited supply [1]. In particular, the ferrite-assisted synchronous reluctance machines (FA SynRMs) are regarded as one competitive candidate which incorporate...
In recent years, coaxial magnetic gears (CMGs) are particularly attractive for applications desiring high torque density, such as electric vehicles and wind generators [1]. They can offer several advantages like low acoustic noise, maintenance free, and inherent overload protection in comparison with conventional mechanical gears. However, because of the modulation effect by the stationary ring, the...
Vernier permanent-magnet (PM) motors which exploit magnetic gear effects to modulate the magnetic fields are capable of producing high torque at a relatively low speed [1]-[3]. Due to its structural compactness, high torque density, high efficiency, these motors are very suitable for direct-drive applications such as electric vehicles. A new kind of vernier PM motor has been presented in [4], which...
Permanent magnet (PM) machines possess the merits of high torque density and high efficiency which is very suitable for some applications such as electric vehicles (EVs) [1]-[4]. Over the years, the surface PM and interior PM types, have been extensively studied and developed. The 2004 prius interior PM machine with the advantages of high torque density and wide speed range has been built and applied...
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