Comparison of two transverse flux machines for an aerospace application

Abstract

Newcastle University ePrints-eprint.ncl.ac.uk Jordan SJ, Baker NJ. Comparison of two transverse flux machines for an aerospace application.

A Review of Transverse Flux Machines Topologies and Design

“…Aircraft and spacecraft (M) [96][97][98][99]. Two 160 kVA TFMs have been proposed for aerospace applications [96,97].…”

“…Aircraft and spacecraft (M) [96][97][98][99]. Two 160 kVA TFMs have been proposed for aerospace applications [96,97]. A high torque density and good thermal performance are key aspects in the design process: for this application, liquid cooling is not suitable due to safety, mass, and maintenance restrictions [97].…”

“…Through the definition of a flux concentration factor, it is shown that the air gap flux density, and so the torque density, increase with radial length of PMs and pole number [89]. However, the combination of high flux density and high pole number produces a strong reluctance torque and then cogging and ripple torque [96,97]. The most used flux-concentration techniques are the circumferentially-magnetized PMs in the rotor or the stator (Figure 7b) and the Halbach array (Figure 8a) [15,59,60,68,69,72,74,75,114,115].…”

Experimental comparison of two linear machines developed for the free piston engine

“…The LSM is a surface‐mounted PM machine, which is a conceptually simple topology, analogous to the surface‐mounted rotary synchronous PM machine, known for high overload torque density and relatively straightforward construction. The TFM, on the other hand, in its rotary form requires unconventional construction [5], is known for effective use of PM material, has good rated performance but is less good in extreme overload conditions [6].…”

Study of the assembly, build and test of a linear transverse flux machine

“…Machine building and assembly also poses challenges compared to other linear machines which can be built from flat laminations in the conventional manner. Rotary versions of the TFM have been presented using SMC [3], flat laminations [4], a combination of SMC and flat laminations [5, 6], and bent laminations [6]. The advantage of having no competition between space requirements of flux carrying teeth and space occupied by windings is well documented in [2].…”