Addressing the Challenges of Lightweight Aircraft Electric Propulsion through Electrical Machines with Air-gap Windings

Author(s):  
Philip H. Mellor ◽  
Callum Heath ◽  
Suzanne Collins ◽  
Nick Simpson ◽  
Ian Bond
1988 ◽  
Vol 71 (1) ◽  
pp. 43-55 ◽  
Author(s):  
K. P. Kovács ◽  
R. Belmans ◽  
W. Geysen ◽  
A. Vandenput

2005 ◽  
Vol 41 (5) ◽  
pp. 2020-2023 ◽  
Author(s):  
G.D. Kalokiris ◽  
T.D. Kefalas ◽  
A.G. Kladas ◽  
J.A. Tegopoulos

1978 ◽  
Vol 15 (1) ◽  
pp. 53-67
Author(s):  
B. L. Jones

Torques in electrical machines are developed largely by iron parts rather than conductors. Simple apparatus has been developed to demonstrate the mechanism of torque production. Analyses in terms of iron surface forces, of changes in coil inductances and of hypothetical air gap conductors are contrasted and compared with measured results.


Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 658-673
Author(s):  
Raphaël Pile ◽  
Jean Le Besnerais ◽  
Guillaume Parent ◽  
Emile Devillers ◽  
Thomas Henneron ◽  
...  

AbstractThe Maxwell stress tensor (MST) method is commonly used to accurately compute the global efforts, such as electromagnetic torque ripple and unbalanced electromagnetic forces in electrical machines. The MST has been extended to the estimation of local magnetic surface force for the vibroacoustic design of electrical machines under electromagnetic excitation. In particular, one common air-gap surface force (AGSF) method based on MST is to compute magnetic surface forces on a cylindrical shell in the air gap. However, the AGSF distribution depends on the radius of the cylindrical shell. The main contribution of this study is to demonstrate an analytic transfer law of the AGSF between the air gap and the stator bore radius. It allows us to quantify the error between the magnetic surface force calculated in the middle of the air gap and the magnetic force computed on the stator teeth. This study shows the strong influence of the transfer law on the computed tangential surface force distribution through numerical applications with induction and synchronous electrical machines. Finally, the surface force density at stator bore radius is more accurately estimated when applying the new transfer law on the AGSF.


Author(s):  
Alexandre Colle ◽  
Thierry Lubin ◽  
Jean Leveque

The transition to electric propulsion aircraft requires electrical motors or generators with high power density. The “zero resistivity” of the superconducting materials could be used in electrical machines to produce high magnetic fields and reduce the use of heavy components such as the ferromagnetic parts. The discovery and recent developments in High Temperature Superconductors (HTS) technology make the superconducting machine a serious candidate in the future of aircraft. The design of a superconducting machine is strongly dependent on its electromagnetic and thermal behavior. In this paper, the design of a 50 kW superconducting aircraft generator is presented. The mass of the cryogenic cooling system is included into the design in order to optimize the entire superconducting system. The study shows that the optimal temperature which conduct to the lighter superconducting system depends on the power of the superconducting machine.


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