matching battery to electric motor

[electricSlide]

Hello, I am looking for a little assistance with a project I am working on. I am trying to power an electric motor with two or three batteries. My choice of batteries are 40v 96wh rechargeable batteries. Unfortunately I cannot find any electric motors that work with 40v. I have found a 400w 24v DC motor that I am interested in, but of course I cannot plug my batteries into this. What kind of convertor can be used to power this motor?
Thanks

 

[LiteYear]

The right answer to your question is a "DC-DC converter". But I suspect that's not the right answer to your problem.

That's a 17A motor you're playing with, so you're going to need to take some precautions. You'll probably find that DC-DC converters at that power level are hard to come by, and require quite a bit of heat sinking. Perhaps a better solution would be to take another look at your "40V" battery - there's no battery chemistry I'm aware of that actually gives you 40V, so I suspect your battery is actually a collection of cells in series. Could you break the series apart and parallel them at closer to 24V instead?

Remember also that depending on the battery chemistry, the voltage at the terminals can be very different from the nominal value as the battery is charged and discharged. Depending on your load, you might also need to consider a regulator of some sort to maintain the voltage you need.

 

[wayne440]

36V motors are readily available - one common use is to power bicycles. Controllers for same are also on the market.

http://www.aliexpress.com/price/400w-motor-bike-motor-price/36V-400w-motor-bike-motor-35-353326.html

 

[Motorwinder]

The 24 volt motor will work with 40VDC. The output will increase to about 660 watts. DC power is proportional to input voltage. Doubling the armature volts doubles the horsepower.

 

[blacksea]

If you plan using any driver/amplifier then it can limit output voltage to motor up to 24VDC, i.e. you don't need another DC-DC converter.