High-speed axial-flux permanent-magnet generator with coreless stator

Abstract

High-speed axial-flux generators (HSAFGs) with coreless stators are regarded as high-power-density, small-size, high-efficiency machines for use in distributed power generation systems (as microturbines). This paper presents a modelling procedure for such generators with details. The ratio of inner to outer diameter (λ) in axial-flux machines is considered in the same way that the ratio of length to diameter is considered in radial-flux (conventional) machines. The optimized λ is determined for an HSAFG with three rotors and two stators by careful consideration of the output voltage and efficiency variations versus λ. It is concluded that λ plays an important role in the HSAFG and requires careful attention when the machine is designed.Les générateursà haute vitesse età flux axial (HSAFG) avec stators sans noyau sont considérés comme des machines de haute densité de puissance, de petite taille età haut rendement. Ils sont utilisés dans des systèmes de génération d'énergie distribuée (comme les microturbines). Ce document présente une procédure de modélisation pour ces générateurs avec les détails. Le rapport entre le diamètre intérieur et extérieur (λ) en machinesà flux axial est considéré, tout comme le rapport de la longueur et le diamètre est pris en compte dans les machinesà flux radial (classique). Le λ optimisé est déterminé pour un HSAFG de trois rotors et deux stators par un examen soigneux de la tension de sortie et des variations de l'efficacité en comparaisonà λ. Il est conclu que λ joue un rôle important dans le HSAFG et requiert une attention particulière lors de la conception de la machine.

High-Speed Generator and Multilevel Converter for Energy Recovery in Automotive Systems

“…Further to that, as the core is made of conventional silicon-grade iron strip, the slot-less arrangement avoids punching, and the core manufacturing process does not actually expose the magnetic material to significant mechanical stresses. A coreless design of the machine winding [12], [13] was also considered but discarded due to a much higher mass of PM material usually required.…”

Micro-Generator Design for Smart Grid System (Comparative Study)

“…The main applications of PMSG are for power generation as part of renewable energy resources and main generators for aircraft, etc. [5][6][7][8][9][10][11][12]. The sizing of HSPMSG design must address system topology for good power/volume, low cost, and superior efficiency.…”

“…The influence of the choice of stator lamination material on iron loss in a high speed, high power, and permanent magnet generator is investigated. We study the optimum design of high speed PM alternators for applications in distributed power generation systems [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The high speed PM machine has been widely used in distributed power generation.…”

Design Analysis of High-Speed Axial-Flux Generator

“…At last, the inductance matrix of the machine can be found as below: For modeling the resistance of stator (Copper Litz wire), the below formula was used [24] :…”