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WaxyChicken 01-22-2008 08:04 PM

Alternative to big motor and big $$$?
Link:how to savlage cheap DC motors

There is a junkyard in my area where i can get these CHEAP. i mean DIRT CHEAP - say - $10 to $50 a pop depending on the actual original car.

instead of spending a fortune for a big motor, is there some way I can use several of the small motors for an EV construction?

I probably wouldn't be able to use one at each wheel because there isn't likely to be an easy computer balancing system to find, I'm thinking more of having 3 or 4 of them under the hood. The problem i see is one may grab the gear more than another causing one to do a brunt of the work.

Any ideas?

I'd like to hook them up to an Anderson CVT and i'm thinking of using a serpentine belt.

dremd 01-22-2008 08:49 PM

Can you give us some specs on these motors? Golf cart motors I'm guessing?

SVOboy 01-22-2008 08:59 PM

That chop top metro somewhere around here uses several motors rather than one large one.

WaxyChicken 01-22-2008 09:28 PM

I'm having trouble finding any motor specs anywhere for "Radiator Fan Motor" (often times it gets confused with the actual motor on the fan blades, but the one i'm refering to is on the cars serpentine belt)

but i am finding that brand new the motors run from $50 to $350 depending on the brand, intended car model, etc.
Radiator Motor

dremd 01-22-2008 09:31 PM

I see, Radiator fan motors, good for little projects, but I don't think you'd have any luck with anything near full sized

WaxyChicken 01-22-2008 09:45 PM

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SVO Boy, i can't find the metro you mentioned. (i swear, i have been searching)

Dremd, one may not be very strong or have alot of options, but i'm refering to using several working together.

SVOboy 01-22-2008 09:51 PM

Here you go:

dremd 01-22-2008 09:51 PM

Around here you can pick up a junk golf cart for around $200 with a motor equivalent to 10 fan motors. Or if you can do like Metrompg and get a forklift you'd be much better off.

WaxyChicken 01-22-2008 09:54 PM

Thanks SVO!

And you're right:

Originally Posted by SVOboy (Post 1842)
Wow! Can't believe I never saw this. Amazing stuff!

It looks like motors of the same size, the question is the power. a chain system such as they are using may be much simpler and more efficent than a belt system because then it wouldn't depend on friction for gear turning.

WaxyChicken 01-22-2008 09:58 PM

Dremd, thanks. I'll keep my eyes open. but the big price all at once won't pass the wife test. she'd be more willing to let me use an allowance system.

You have to thank wives, if it wasn't for them we would lose the mortgage and live in our EVs. LOL

trebuchet03 01-22-2008 10:06 PM

Here's your solution

So this guy - Thomas Knight - makes electric turbos (technically superchargers for the anal). Instead of using one giant motor, which would take up too much space and wouldn't provide the power curve he wanted... He ganged smaller motors in parallel and apparently had a working prototype...

Here's an Article on it...

Perhaps something like this is a suitable solution to combine motors.... Belts will likely just eat **** in short order...

WaxyChicken 01-22-2008 10:40 PM

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Nope, way over my head.


:: Parallel Motors
When parallel motors are connected to a drive the extra capacitance of the parallel motors compared to a single motor of the same combined power can cause problems. Allow 10 - 15% extra for drive sizing. In addition, the capacitance effect can be reduced if the motor cabling is "daisy chained" (i.e., connected from the drive to motor 1, then motor 1 to motor 2, etc.) rather than each motor being connected directly to the drive output. In extreme cases, the use of output filters is advisable.

if i understand correctly, this means the
chop top Metro does not have the best drivetran system.
a more accurate one would be:

WaxyChicken 01-23-2008 12:07 AM

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You've said Fan Motors would be too weak, how about Starter Motors?
They have a thinner body which would allow more in an alignment and they are powerful enough to crank an engine.

Twilly 01-26-2008 05:47 PM


Originally Posted by WaxyChicken (Post 6546)
You've said Fan Motors would be too weak, how about Starter Motors?
They have a thinner body which would allow more in an alignment and they are powerful enough to crank an engine.

Starter motors are made for short term use... You would burn them up in no time...

dremd 01-27-2008 10:26 PM

Starter motors *could* be a better alternative to fan motors in my opinion.
I had my TDI starter apart yesterday (clean and lube to shut it up) and it is a sturdy little motor, however no cooling at all, I don't know why you couldn't cut some holes in each end and put a fan on the drive shaft to keep things under control. I don't know how efficient they would be . . . . or life span when cooled . . . . Just thought I'd throw that out there.

Also Floor polisher motors, or make friends with someone at a fork lift place?

Keep an eye on craigslist, Flea bay.

WaxyChicken 01-28-2008 06:37 PM


Originally Posted by dremd (Post 7173)
Keep an eye on craigslist, Flea bay.

I already am. :D

Ryland 01-28-2008 11:02 PM

How a starter motor is constructed is going to have as much of an affect on the cooling then simply the lack of holes.
Starter are powerful little motors, they might draw 100 to 500 amps for a second or two (1-6 hp), and because of that are designed with heavy soft copper/lead brushes insted of carbon, bronze bushings insted of ball bearings or roller bearings, and heavy solid resin around the windings to keep them from moving, the motor in my citicar is 3.5hp and is the size of a healthy water melon.

go with a motor designed for contuinued use.

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