Picture 1 - Cable car on
turntable Picture 1 is a screen-shot from a video of a San Francisco cable car on a turntable. Watch video. A more extreme example: a 190 ton steam train on a turntable. Three man turn it 180 degrees in about 90 seconds. Watch video. |
Picture 2 - Repair on turntable |
Picture 3 shows one example. Note: the housing holding the
stator and drivers should be self-supporting and not "lean" on the
rotor / turntable.
Flange-less wheels running on a rail help to keep the turntable / rotor will stable while spinning so it is possible to accurately align it with the stator and keep the air gap between turntable / rotor and stator within optimal distance.
In order to save weight the turntable / rotor should as much as possible be made of carbon fiber or a futuristic material like aluminum that floats on water.
Picture 3 - "Turntable" generator |
Picture 4 - Rotor Wind Generator |
Picture 3a |
Picture 3b |
Picture 3c | Picture 3d |
In order to explore possible energy potential of the idea,
data from a design study (thesis)
on a 2,25 MW (2 MW to grid) permanent magnet direct drive generator,
spinning at 18 rpm, for wind energy applications was used.
The outside diameter of the generator laminations (basically
the stator) is given as 3,9 meter (picture 6). The weight of the
permanent magnets as 1,86 tons and the weight of iron (for all the
generator) as 17,31 tons (picture 7).
Based on this data, for calculation purposes the diameter of the rotor
is set at 4 meters and the weight of the turntable / rotor is
set
at ~ 20 tons (the weight of iron: 17,31 tons +
the weight of the permanent magnets: 1,86 tons). A safe estimate
because some of the iron is also needed for the stator.
Next: How much energy would be needed to spin a 20 tons, 4
meter in diameter rotor traveling at 13,56 km/h*? *(4 meter x 3,14 x 18 rpm / 60 seconds = 3,77 m/s = 13,56 km/h)
Picture 9 shows a container with a load capacity of 42000 kg (twice
the rotor weight. It's travel speed with a load is 21 km/h (13,56 km/h
needed). It is powered by 250 kW diesel engine which has a fuel consumption of 15 - 28 l/h.
A 2000 kW diesel generator consumes at full load 141,9 gal/h = 537 l/h. Source.
Thinking of the cable car video, than this engine could be
strong enough to spin the rotor. Even if 4 engines would be
needed, their combined fuel consumption would still be significantly
less than that of a 2000 kW diesel generator.
Another way to look at it. Four 250 kW diesel engines would give it a power-to-weight-ratio of
50 watt per gram. A TGV 2N2 high speed train (380 t, 320 km/h top speed, power 9400 kW)
has a power-to-weight-ratio of 25 watt per kilogram. Source. There is no real difference between running a train on wheels and running a rotor on wheels.
The real question of course is: Why not use electric motors instead
of diesel engines? Well that would mean.... No, we all know that is
impossible. Right?
Picture 6 - Technical Data 2,25 MW Wind Turbine Source: Page 9 of Anoop_Thesis_Final.pdf |
Picture 7 - Weight data 2,25 MW Wind Turbine Source: Page 9 of Anoop_Thesis_Final.pdf |
Picture 8 - Reach Truck / Container handler Technical data Model C4230 TL / 5 Load capacity 42000 kg Service weight 70400 kg Travel speed with / without load 21 / 25 km/h Engine 250 kW diesel Fuel consumption according to VDI cycle 15 - 28 l/h Source technical data and picture. |
Picture 9 - Technical Data Car Turntable Picture 9 shows the specifications of car turntable with a loading capacity of 6000 kg (30% of rotor weight) and a maximum speed of 1 rpm = 1,32 km/h**(13,56 km/h needed). Power requirement 0,75 kW. **(7 meter diameter x 3,14 x 1 rpm / 60 = 0,37 m/s = 1,33 km/h). |
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