|
A wheel-mounted permanent magnet synchronous motor has a higher efficiency
than the system consisting of asynchronous induction motor drive, mainly due to
missing transmission gears.
- Tests made on the RMT1A (an experimental motor developed at the Railway
Technical Research Institute (RTRI) in Tokyo) revealed, that efficiency is
improved from 87,9 % for a conventional asynchronous induction motor to 94,2 %
for the RMT1A wheel-mounted synchronous motor. This means a relative
improvement of 7 %.
- Koch et al. 2002 studying the feasibility of wheel-mounted permanent
magnet synchronous motor for a main-line locomotive assumed an efficiency of
conventional asynchronous motor gears of 93,6 % at payload and calculated
for the efficiency of the wheel-mounted synchronous machine a value of 95,6 %.
This is a relative improvement of only 2 %.
We heuristically assume that an intermediate value of 4 % is realistic for
many applications. This is used in the following elasticity table.
|
|
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 |
4 % |
1,00 |
4 % |
|
|
|
yes |
1,11 |
4 % |
|
Intercity
train |
electric |
no |
1,00 |
4 % |
|
|
|
yes |
1,12 |
4 % |
|
Regional
train |
electric |
no |
1,00 |
4 % |
|
|
|
yes |
1,33 |
5 % |
|
Suburban
train |
electric |
no |
1,00 |
4 % |
|
|
|
yes |
1,42 |
6 % |
|
Freight |
electric |
no |
1,00 |
4 % |
|
Range: |
4 - 6
% | |
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date created: 2002-10-09
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