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In the actual operation, the stator magnetic slot wedge is vibrated by the large alternating electromagnetic force, which causes the stator magnetic slot wedge to defect and then affect the starting performance and efficiency of motor.
This paper proposes a new permanent-magnet vernier (PMV) in-wheel motor to meet the new demands arising from in-wheel electric vehicles. It can offer the advantages of light weight, compact size and low-speed high-torque operation. The mechanical gear can be removed by introducing flux-modulation poles. By using the time-stepping finite element method, the performance of the proposed machine can be...
Deep brain stimulation (DBS) is needed for treatment of neurological and neuropsychiatric disorders [1-6]. Currently DBS with implanted needle electrodes requires a delicate surgical procedure that is invasive and costly. Transcranial magnetic stimulation (TMS) has been developed and attempted for non-invasive treatments of various neuropsychiatric disorders [7-10]. Unlike DBS, the pulse magnetic...
Direct-drive permanent magnet (DDPM) generators have been widely adopted in the wind power applications due to the higher reliability, and lower maintenance cost, compared to that of the doubly fed induction generators (DFIG) with the gearbox [1]. However, the magnets are vulnerable to be demagnetized under the short circuit condition. Due to the reliability concerns, the demagnetization performance...
Flux-modulation power-split devices for hybrid electrical vehicle (HEV)s have been obtaining attentions in recent years due to its brushless and high torque density. However, the flux-modulation power-split devices always suffered from low power factor, which is even lower than 0.6 and results in higher cost and larger volume in the converter. This paper proposes a novel dual mechanical port, spoke...
Electric Machine is an energy conversion device, which realizes the electrical energy and mechanical energy convert to each other through electromagnetic power or electromagnetic torque. Electromagnetic torque is an important medium for this conversion progress. Thus accurate estimation or model of electromagnetic torque is desired for designing and analyzing the electric machines. Furthermore electromagnetic...
PMSMs with concentrated windings gain more and more interests due to the very short end winding and advantages in the production process, for which they are desirable for wind power generations, electric vehicles and torque propulsion and so on [1]. However, concentrated windings produce a rich spectrum of flux density harmonics, which rotate asynchronously with respect to the rotor, inducing eddy...
Permanent magnet synchronous machines (PMSM) have high torque density, efficiency, power factor and so on compared with other type of machines. PMSMs can be separated into traditional well-known distributed wounded (DW) machines and fractional slot concentrated winding (FSCW) machines [1]. FSCW machines own low cogging torque, compact structure, high power density, and convenient fabrication, etc...
As one of the most important kinds of distributed generation systems, the micro turbine generation system can be flexibly installed near the end user, and becomes an important trend of development in DGS gradually. The high speed permanent magnetic generator (HSPMG) can be properly applied in a micro turbine generation system and benefits the system from high efficiency, high power density, simple...
Eddy current loss is a typical problem in permanent magnet machines especially in machines equipped with fractional-slot concentrated windings. PM segmentation which cut the circulating path of eddy current in radial flux PM machines have been widely studied in literature to reduce this loss. Both circumferential and axial magnet segmentations were evaluated by an analytical method concerning the...
The electromagnetic performance of alternative single layer modular switched flux permanent magnet (SFPM) machines, i.e. conventional, C-core, E-core and modular, is compared by finite element analysis in this paper. The comparison includes winding factor, open-circuit flux density, back-EMF and electromagnetic torque, together with the influence of four slot/pole number combinations (12s/10p, 12s/11p,...
This paper presents the electromagnetic loss analysis and mitigating methods of switched flux permanent magnet (SFPM) machines. The 2-dimentional finite element (2-D FE) method is used to calculate the flux density in all the mesh elements within stator and rotor iron cores, then the stator and rotor hysterisis, eddy current and excess losses are calculated. The PM eddy current losses have been calculated...
This paper presents a novel structure of double salient interior permanent magnet machine (DSIPM machine) based on mutually coupled switched reluctance machine (MCSRM). Due to its salient rotor structure, the DSIPM machine can have less magnetic and iron materials as well as higher dynamic response than conventional IPM machines. The comparison of electromagnetic performances in terms of self and...
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