Multilayer air gap winding designs for electric machines: theory, design, and characterisation

Autor: Norman Borchardt, Roland Kasper, Jörg Sauerhering, Wolfgang Heinemann, Kimberly L. Foster
Jazyk: angličtina
Rok vydání: 2019
Předmět:
permanent magnet machines
rotors
coils
air gaps
permanent magnet motors
torque control
magnetic cores
magnetic flux
electric potential
magnetic circuits
machine windings
finite element analysis
torque
fourfold increase
torque-to-weight ratio
ohmic power losses
single layer design
multilayer air gap
magnetic circuit design
16-fold increase
four-layer winding design
global optimum torque
single-layer winding design
phase self-inductance
torque ripple
multilayer design
torque-to-mass ratio
optimal torque output
useable magnetic flux density
additional layer
air gap height
winding layer
machine current
existing validated machine design
fixed ohmic power loss boundary condition
magnetic poles
meandering geometry
slotless magnetic core
meandering structure
electric machines
novel single layer air gap winding
machine torque
counter-electromotive force
Engineering (General). Civil engineering (General)
TA1-2040
Zdroj: The Journal of Engineering (2019)
Druh dokumentu: article
ISSN: 2051-3305
DOI: 10.1049/joe.2018.8071
Popis: Here, the authors present a magnetic circuit design with a multilayer air gap winding. This design provides a new degree of freedom in the design process. The approach is based on a single layer air gap winding, which demonstrates the ability to scale, permitting application in small and large electric machines. A meandering structure with coils arranged parallel to the rotation axis are mounted in several layers on a slotless magnetic core. The authors consider a fixed ohmic power loss boundary condition to compare this approach with an existing validated machine design. Machine current is reduced with each winding layer, while self-inductance and induced voltage are increased. Since the air gap height is increased with every additional layer, the useable magnetic flux density decreases. Accordingly, an utilisable range in which optimal torque output is obtained can be described analytically. The authors provide comparison between a single-layer winding design, which achieves the global optimum torque, and a four-layer winding design, which gives a 16-fold increase in the phase self-inductance. Additional thermal simulations prove that the multilayer design give the same ohmic power losses as the single layer design, without having any thermal issues and hot spots.
Databáze: Directory of Open Access Journals
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