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New Project involving old water pump motor
gourami:
I recently came into possession of a 3/4 horsepower motor that was used for a well pump. I want to use it for a small electric vehicle, like a scooter or moped. Here is my idea, and I would really like advice to see if it would work.
The motor's specs are:
60Hz
230v
6.8 Amp
.55KW
3450 RPM
Other parts:
2 car batteries
2 UPS modules
some type of gearing and driveshaft
My Plan:
Take the two car batteries, and connect them to the UPS's Inverters. Take the 120v from each inverter and put it into each 120v wire of the motor. Motor drives two rear wheels through a differential of some type.
Suggestions or comments?
Samstag:
You can't connect two inverters to double the output voltage. They'll spend most of the time fighting against each other until one or the other dies a fiery death. They also aren't very good at providing high-current output, which is what that motor is going to want.
If the invertors are good ones you can use one opf them with the batteries in parallel to power the motor. You'll get a lot less startup torque but the top-end RPM shouldn't suffer too much.
danny_galaga:
can you have a look to see what type of motor it is? if it has brushes, it wont need to run on AC. you'll still need to get the voltage up (for DC it will have to be about half that of the AC, so around 100-120V)
if it has brushes, instead of car batteries and inverters, you could use NiCad batteries. you could probably get something going with sub C cells as used in RC car battery packs. maybe 15 of these. thats about $400 bucks worth. compare to the prices of the other parts, and the fact that it will be a lot lighter and more compact...
that was the first pack i found on the net. you can get cheaper and/or lower amperage and spend maybe only $200. charging might be a pain. youd either need a custom made charger or unplug all the batteries and charge the individual 7.2V packs!
hmmm, im thinking now you might want to save that motor for some other project. while in general higher voltages tends to be more efficient (voltage drop is proportionally lower) a scooter or what have you would be much more easily built with a lower voltage motor. 24V is a good size. then two sealed motorcycle batteries in series.
TOK:
Check this place out... Found it on another forum and thought it was really cool. I don't like the bike they used for the demo, but I think I'm going to get their universal kit and put in on a BMX bike. Will be fun while riding bikes with the kid. ;D
http://www.dpxsystems.com/
Ken Layton:
During startup, an electric motor can easily draw double the current than what it normally operates on.
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