Aviation is one of the fastest growing methods of transportation, with passenger
volumes expected to triple in the next twenty-five years. It is also contributing
an ever increasing share of global emissions. One of the highly effective ways to
reduce emissions in aerospace is through electrification. This is already underway
with the development and adoption of More Electric Aircraft. A next step is the
development of hybrid propulsion, or all electric aircraft, with electric propulsion
systems. In order to achieve this goal, the power density of the electric drive is
of critical importance. Axial flux permanent magnet synchronous machines have
been identified as one the highest power density machine types suitable for these
electric drives.
In this thesis, an axial flux permanent magnet machine is developed for an
electric aircraft propulsion system. A review of electric machines in aerospace applications
is conducted, followed by an overview of the design and simulation of
axial flux machines, and a presentation of the machine under study. The primary
objective of this thesis is to improve the stator design of the axial flux machine by
reducing loss, weight, and volume. Magnetic materials are studied, and using grain
oriented silicone steel for the stator teeth is shown to improve torque production
of the machine. The wire, coil, and stator geometry are modified to reduce copper
loss. A tightly spaced coil, axially centered on the tooth, with high aspect ratio
wire and chamfered pole shoe is shown to reduce loss. Finally, a compact stator
winding is proposed with coil terminations on the inner diameter of the stator.
The proposed winding reduces the volume of the machine, as well as further reducing
copper loss due to less wire utilized. These actions significantly improve
the efficiency of the machine, while reducing weight and volume. / Thesis / Master of Applied Science (MASc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/26694 |
| Date | January 2021 |
| Creators | Goldstein, Cyrille |
| Contributors | Emadi, Ali, Electrical and Computer Engineering |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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