This paper aims to investigate the vibration performance of an axial flux permanent magnet synchronous machine (AFPMSM) with two contra-rotating rotors. A rapid analytical model electromagnetic forces acting on tooth tips AFPMSM is proposed. The nodal distributing teeth are converted into radial, tangential and concentrated forces. Furthermore, force modulation effect stator considered during analysis. On this basis, radial accelerations excited by in different directions obtained compared....

—This article analyzes the fault location, negative-sequence component, and current harmonic content of first AP1000 third-generation 1250-MVA nuclear half-speed (four-pole) turbo-generator with internal phase faults. To this end, armature winding an is systemically explored by using both experimental method field-circuit coupling simulation method. The short circuit one worst faults that a generator can experience; such may have serious consequences for power large-capacity turbo-generators...

This paper proposes an improved transient negative-sequence calculation formula for a large-capacity nuclear power generator system under unbalanced network conditions. Because of the disadvantages traditional ratings, I2*2 t is concluded to be inadequate rating imbalance capability. In fact, many factors, such as possible fault asymmetry, duration and non-periodic components, should also considered when generator. According inherent relation between rotor heating capability, component added...

The behavior of surface plasmon polaritons (SPPs) generated on the a silver nanowire by coaxial Gaussian beams in Kerr nonlinear mediums is studied numerically. Enhancement propagation SPPs realized due to introduction effect. Further adjusting nonlinearity or beam’s intensity results soliton-like SPPs. This can be explained self-focusing effect transferring more light into SPP modes and counteracting attenuation caused absorption metal. result may contribute SPP-based applications where an...

This paper analyzes the harmonics and vibration under different fault-tolerant current control when one-phase winding of dual three-phase permanent magnet synchronous motor (PMSM) is an open circuit fault. Firstly, load condition subdomain model breadloaf surface-mounted (PM) PMSM established. Secondly, working conditions fault are set from perspectives no (NFT) control, maximum torque (MT) minimum copper loss (MCL) single mode (STPM) control. The electromagnetic force four analyzed. Then,...

As the energy and environment issues are becoming increasingly prominent, electric vehicles have become main new of future development because their advantage environmental protection, clean conservation. Electric vehicle charging station is a very important part facilities, popularization can't do with construction station. The chargers in stations nonlinear equipment, they will produce harmonic pollution, so it's practical significance to research on problems. By using power system...

This paper start from the value of materials and availability market supply then put forward definition relative that according to availability; Next combined with C.V analysis, on basis stable demand companies, seminary matrix is designed; Finally, purchasing positioning model established, strategy analyses can be provided characteristics purchased materials.

Low radial electromagnetic force (REF) harmonic is an important way to reduce vibration and noise of permanent magnet synchronous motor (PMSM). For integer slot PMSM, it generally considered that the 0-order slot-frequency main source in low frequency domain. But with surface (PM) mounted rotor, bread type PM, stator skewed larger air gap length applied area, should consider both higher spatial order REF. In this paper, a 16-pole 96-slot studied, subdomain analytical model calculation PM...

In this article, the low-frequency electromagnetic vibration of dual three-phase PMSM (DTP-PMSM) with neutral point isolation are examined considering current harmonics and winding modes. The DTP-PMSM has reliable advantage stable operation relying on a single set windings, but 5th 7th in different modes have effects performance motor. Firstly, based 24-slot/28-pole DTP-PMSM, magnetomotive force two analyzed. Then, influence radial is examined. analysis, tooth modulation effect considered....

Electromagnetic vibration (EMV) is a key indicator for the performance analysis of permanent magnet synchronous motor (PMSM), and when using finite element method (FEM) EMV prediction analysis, results are greatly affected by mesh quality calculation steps. Based on traditional accurate subdomain (SDM) surface-mounted PMSM, this paper considers space harmonic weakening air gap flux density (AGFD) shaping, skewed magnet, slot auxiliary structure, establishes analytical model radial...