Thermal Design of Linear Induction and Synchronous Motors for Electromagnetic Launch of Civil Aircraft

Abstract

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. Abstract-The engine size of modern passenger transport aircraft is principally determined by take-off conditions, since initial acceleration requires maximum engine power. An electromagnetic launch (EML) system could provide some or all of the energy required at takeoff so that the aircraft engine power requirement and fuel consumption may be significantly reduced. So far, EML for aircraft has been adopted only for military applications to replace steam catapults on the deck of aircraft carriers. This paper will describe the potential application of EML to propel civil aircraft on the runways of modern airports. A comparison of synchronous and asynchronous electrical motor systems designed to launch an A320-200 sized aircraft is presented. The paper also describes a solution of the transient heat transfer problem applied to the conductive components of EML systems.

Eddy Current Loss Reduction in Axial-Flux Motors Using 3D Printing

“…As the laminated structure is used in AFPMSMs for eddy current reduction, the principle of eddy current at the core is presented in this section. The eddy current loss is affected by the total length of the eddy current loop, as shown in Equation (1) where Pe is the eddy current loss, k is the conductivity, t is the thickness of the conductor passing through, f is the frequency, and Bm is the maximum magnetic flux density. As described in Equation ( 1), the eddy current loss is proportional to the square of the thickness of the conductor.…”

“…Most AC machine drive systems applied to aircraft, automotive, and industry are built with permanent magnet and induction machines. Induction motors (IM) have been widely used in industry and propulsion systems applied in aircrafts [1][2][3]. It has also been indicated that a water pump, considered a heart part of the irrigation system, has been built with IM.…”

Development of a Thermal Analysis Tool for Linear Machines

“…Analytical methods allow a very fast computation of working temperatures [1,3,4,15,16], so they are the way to go if iterative optimization methods are employed. As a reference, Bertola et al [20], computed the transient thermal behavior of a linear permanent-magnet machine and a linear induction machine for electromagnetic launch systems. The computation was based on simple formulations, which allowed the authors to evaluate the temperature rise of the machines under different current density values.…”

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

“…In precision manufacturing, there are stricter demands for linear motors, such as those regarding thrust density and thrust fluctuation. Besides structural improvements, increasing the armature density of the motor is the most effective way to increase the thrust density [1][2][3][4][5]. However, the temperature rise that is caused by the excessive electrical density is also an unacceptable problem in the precision field [6,7].…”