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General information
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Description
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The rotor of a transversal flux machine consists of permanent magnets arranged in ring-shape. The direction of the magnetic flux is perpendicular to the
rotational vector. The transversal flux construction principle permits a very high power density.
A motor with 600 mm diameter and 200 mm length (hardly bigger than a conventional disk brake) has a power output of 200 kW. |
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General criteria
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Status of development: research & experiments |
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Time horizon for broad application: in > 10 years |
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Expected technological development: highly dynamic |
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Benefits (other than environmental): big |
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Barriers: high |
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Applicability for railway segments: high |
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Type of traction: electric - DC, electric - AC
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Type of transportation: passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines, freight
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Grade of diffusion into railway markets:
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Diffusion into relevant segment of fleet: 0 % |
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Share of newly purchased stock: 0 % |
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Market potential (railways): highly uncertain |
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Environmental criteria
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Impacts on energy efficiency:
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Energy efficiency potential for single vehicle: 5 - 10% |
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Energy efficiency potential throughout fleet: 2 - 5% |
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According to DB AG research efficiency of transversal flux machine
couplings is 97 %, compared to 90 % of asynchronous motor gears couplings.
That is a relative improvement of ~ 8 %. According to the following elasticity
table, this yields traction energy savings of 8 12 %.
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Traction |
Brake energy
recovery |
Effect on
efficiency of power train |
Elasticity
with regard to efficiency of power train |
Effect on
total energy consumption for traction |
High speed
train |
electric |
no |
8
% |
-1,00 |
-
8 % |
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yes |
-1,11 |
-
9 % |
Intercity
train |
electric |
no |
-1,00 |
-
8 % |
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yes |
-1,12 |
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9 % |
Regional
train |
electric |
no |
-1,00 |
-
8 % |
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yes |
-1,33 |
-
11 % |
Suburban
train |
electric |
no |
-1,00 |
-
8 % |
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yes |
-1,42 |
-
11 % |
Freight |
electric |
no |
-1,00 |
-
8 % |
There is an
additional effect through mass reduction. The transversal flux machine is
roughly 50% lighter than asynchronous machines. Counting gears as well,
transversal flux direct drives are 2/3 lighter than conventional asynchronous
motor drives, an absolute mass reduction of 1000 kg for a 500 kW motor. The
corresponding energy savings will be small compared to the efficiency gains
described above.
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Other environmental impacts: neutral |
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(no details available) |
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Economic criteria
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Vehicle - fix costs: (no data) |
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Vehicle - running costs: significant reduction |
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Infrastructure - fix costs: none |
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Infrastructure - running costs: unchanged |
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Scale effects: high |
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Amortisation: (no data) |
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Application outside railway sector (this technology is railway specific)
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Overall rating
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Overall potential: promising |
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Time horizon: long-term |
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Transversal flux machines are a promising long-term candidate for replacing state-of-the-art traction motors. More R&D is however necessary to overcome current technological shortcomings. |