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Author Topic: Anyone know of a good motor?  (Read 1411 times)

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Offline Hawaii00000Topic starter

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Anyone know of a good motor?
« on: June 19, 2009, 01:18:20 AM »
Lately I've been looking a lot at motors and I've decided that I want motors of a similar rpm/torque to an rc car I have. The car has two motors and is 4wd. After a few tests and some help on this forum, I've come up with this...

car weight: 3lb.
rpm with the car on the ground: 720rpm (17ft/sec)
torque 6.74 lb/in.

First of all, I want to know if that sounds right, but I'm also wondering if anyone knows of a motors with similar specs. So far I haven't found anything.

Here is a video of the car...
rc


Any help would be greatly appreciated.
« Last Edit: June 19, 2009, 01:20:23 AM by Hawaii00000 »
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Offline Hawaii00000Topic starter

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Re: Anyone know of a good motor?
« Reply #1 on: June 20, 2009, 01:36:21 AM »
Ok I think I might use this motor ( http://www.robotmarketplace.com/products/0-COPAL30.html ) but I want to run it on 12v not the 9v that its rated for; would that work? Also, why does it say to use wheels no larger the 1.5 in.?
"God chose to make the world according to very beautiful mathematics."
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Offline Soeren

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Re: Anyone know of a good motor?
« Reply #2 on: June 20, 2009, 10:33:52 AM »
Hi,

Ok I think I might use this motor ( http://www.robotmarketplace.com/products/0-COPAL30.html ) but I want to run it on 12v not the 9v that its rated for; would that work? Also, why does it say to use wheels no larger the 1.5 in.?

The page says:
52.49 oz-in torque @ 12V
770rpm @ 12V
So, at least for very short periods it should work.

Personally I'd go with a motor with a bit of overhead, Llike http://www.trossenrobotics.com/store/p/4927-16-1-36mm-Planetary-Gearmotor-RS-540-Motor.aspx

Also... Look at http://www.energid.co.in/html/other-products1.htm
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=1157
http://www.surplustraders.net/a/0184.shtml
http://www.monstermarketplace.com/Electronics/Landing1471a2351.html
http://www.islproducts.com/prod/gear_motors.htm

Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Hawaii00000Topic starter

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Re: Anyone know of a good motor?
« Reply #3 on: June 20, 2009, 05:19:17 PM »
That motor would be awesome but its discontinued. Its also a little expensive (for my budget). I'll try and find something in the middle of the two motors.
« Last Edit: June 20, 2009, 05:22:16 PM by Hawaii00000 »
"God chose to make the world according to very beautiful mathematics."
-Paul Dirac
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Offline Hawaii00000Topic starter

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Re: Anyone know of a good motor?
« Reply #4 on: June 20, 2009, 05:27:32 PM »
"God chose to make the world according to very beautiful mathematics."
-Paul Dirac
**************************************************************
Its Hawaii Five-O. Get it?

Offline Soeren

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Re: Anyone know of a good motor?
« Reply #5 on: June 20, 2009, 06:24:49 PM »
Hi,

Yes, but with motors bought from new, you usually get what you pay for.
If you want quality stuff cheap, look for surplus or used equipment - don't you have a scrap yard or a recycling facility where you live?

A flea market might have a large fouled up R/C car, perhaps without the transmitter - that might be a potential source too.
Yet another option would be to use a non-gear motor and build the gearbox yourself.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Hawaii00000Topic starter

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Re: Anyone know of a good motor?
« Reply #6 on: June 20, 2009, 09:23:07 PM »
Quote
Yes, but with motors bought from new, you usually get what you pay for.
Thats true but I'm not looking for something too fancy just as long as it works like it says without breaking. Do you think this motor will do that?

Quote
If you want quality stuff cheap, look for surplus or used equipment - don't you have a scrap yard or a recycling facility where you live?
I not sure of any where I can buy used electronics but I can have a look around.

Quote
Yet another option would be to use a non-gear motor and build the gearbox yourself.
I don't think I'll make a gearbox on this robot... maybe when I get more experience.
« Last Edit: June 20, 2009, 09:37:32 PM by Hawaii00000 »
"God chose to make the world according to very beautiful mathematics."
-Paul Dirac
**************************************************************
Its Hawaii Five-O. Get it?

 


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