IEEE Electrification - December 2021 - 62
low-pressure tube. It allows a larger levitation gap than in
air bearings, which is an important safety feature at subsonic
speeds. In particular, maglev has 50 years of
developmental experience with actual systems working
up to 600 km/h and practical lessons learned.
Currently, it is quite hard to know what is going on
inside the commercial hyperloop companies because they
are not very forthcoming in delivering the technical
details. Inspired by the SpaceX Hyperloop competition
(starting in 2017), many companies initially considered a
passive track with electrodynamic suspension (EDS) and
short-primary linear induction motors (SP-LIMs). To
improve the primitive I-beam track employed in SpaceX,
the Inductrack concept of track segmentation has been
proposed to reduce the rolling magnetic drag (proposed
by Post 2000). Hyperloop Transportation Technologies
advertises this technology (https://www.hyperlooptt
.com/technology/).
The EDS system is inherently stable and fail-safe in its
physical nature. The levitation mass on board the capsule is
based on passive Halbach-array lift skies that have no energy
requirement. However, the levitation is repulsive, which
means that the capsule has to float over the track. In addition,
auxiliary wheels must be employed for takeoff and
Grid
Connection
(6 MW)
Solar Harvesting System
Step-Up
Transformer
dc
dc
dc
dc
dc
dc
Grid-Side
Converter
dc
Energy
Storage
38 MWh
37 MW-rms
56 MW-pk
dc
Traction
Inverter
(70 MVA)
Solid-State
Switches
LIM
Capsule
480 km/h
1,220 km/h
LIM
Solid-State
Switches
dc
Traction
Inverter
(70 MVA)
Figure 5. A schematic sketch of the acceleration booster concept (Hyperloop Alpha system). (Source: Musk 2013.) The integration with the
power system and the tube's harvesting of solar electricity is also depicted.
62
IEEE Electrification Magazine / DECEMBER 2021
Capsule
LIM
LIM
LIM
LIM
LIM
LIM
1,220 km/h
480 km/h
Capsule
+
-
https://www.hyperlooptt.com/technology/
https://www.hyperlooptt.com/technology/
IEEE Electrification - December 2021
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