Quote:
Originally Posted by MartinObviously
That doesn't count  as it's only turning a Generator, the batteries power AC motors - which means maximum torque from 0 speed.
That system in a car would make it rapid off the mark as well.
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Not normally any batteries involved in locos. Some locos are D.C. traction motors as well. Hi/lo gearing is achieved by switching the motors from series to parallel wiring, and/or switching the two motor windings from series to parallel (or field weakening), although this does depend on the motor type.
Quote:
Originally Posted by MartinObviously
That's cos the leaf has so little power, I'd imagine. Unless you're being picky, in which case a 2:1 reduction gear is technically a gearbox.
I don't get why the can't just make them direct drive, it's less loss.
I was meaning a setup like a train in a car.  |
Main reason that electric cars aren't normally direct drive is the motor flexibility required. In general you can build an electric motor to make loads of torque, or loads of revs, but it's very difficult (expensive) to do both. Also, a motor that could shift a fully loaded car from standstill as direct drive would be very heavy and suck down a shed load of amps on startup.
Quote:
Originally Posted by MartinObviously
Dat torque doe
Shit aye, just looked up the spec. an 80KW motor hahahaha xD
Single speed reduction gear of almost 8:1  |
Much bigger motors out there. ;-). The fact that most motors can absorb up to 5x their rated power for short periods and it makes you realise the potential for electric drive trains.