Electric motor boost?

[Fab Man]

I don't own an EV but am always thinking about new design technology...maybe some day when EV's can achieve 200+ mile range I may build one myself.

My question is one I am not sure anyone has ever thought about.

Do you think it could be possible to boost the battery output with a kick up transformer...if say, your running a 48 volt battery system, couldn't you get a further range by using a transformer?...the ideal is to boost the voltage output which would require less battery drain...or am I hoovering somewhere in la la land?

Just wanted an answer from the pros

[captainslug]

A transformer doesn't magically increase the wattage. It remains the same.
The point of going to higher voltages is essentially to increase the maximum wattage you can supply to the motor, while still using reasonable sizes of batteries and wires.

1,000 watts is 1,000 watts. 1,000 watts at 12 Volts is 83.3 amps, but 1,000 watts at 60 Volts is only 16.666 amps.
Higher volts and fewer amps will always result in more efficient power transmission.

Originally Posted by Fab Man

maybe some day when EV's can achieve 200+ mile range I may build one myself.

They can, but the cost of the batteries to do so is still exorbitant.

[Fab Man]

Then if I understand you, using a coil would be a better choice...similar to an ignition coil that takes a 12 volt source and jumps it up to 30,000v at a smaller amperage.

[Daox]

Except that no normal controller could handle 30,000V, and ignition coils can't handle any usable amperage (they'd burn out).

[Ryland]

Also remember that every step you put your electricity through you lose something, so if you want a 120 volt or a 30,000 volt car you are best off configuring the batteries to that instead of converting it to a/c so you can run it through a step up transformer, the main reason that home made electric vehicles run at lower voltage is fewer batteries and safer electrical systems, I can bump my 48 volt pack with my hand and not get burnt to bad, I can grab on to half the pack (24 volts) and feel a slight tingle, a 72 volt or higher voltage car could kill me if I was not careful, but the lower voltage also requires larger wires to get the same wattage.

[bennelson]

I believe that hybrids such as the Prius DO bump up the voltage internal to the system.

For example the battery pack may be 144V, but goes up to 300 some for actual use in the motor. I am not sure of the exact reason why this is done.

I think it has something to do with how AC motors work, and possibly have to do with the regen braking as well.