Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: gan02340765 on January 29, 2008, 04:08:16 AM

Title: DC Motor
Post by: gan02340765 on January 29, 2008, 04:08:16 AM
any DC motor suggestion that have stall torque 10Kg above expect AME motor, coz its speed too slow...
Title: Re: DC Motor
Post by: SmAsH on January 29, 2008, 04:13:13 AM
10KG!!! are you serious!?  :'( oyyy ive never heard of such a thing.
Title: Re: DC Motor
Post by: gan02340765 on January 29, 2008, 05:06:44 AM
really one ...the competiton quite stupid one ...10Kg and 50cm*50cm
quite big and heavy...i need a high torque and speed DC motor ..
Title: Re: DC Motor
Post by: gamefreak on January 29, 2008, 06:39:53 AM
lol, too slow, high torque is going to be slow, you could try getting two 5 kg motors and have them run the same load.
Title: Re: DC Motor
Post by: paulstreats on January 29, 2008, 07:10:29 AM
What about motors in washing machines?
Title: Re: DC Motor
Post by: SmAsH on January 29, 2008, 02:54:11 PM
good point...or a treadmill..theyre fast and can move someone up to 140KG
Title: Re: DC Motor
Post by: ed1380 on January 29, 2008, 02:55:55 PM
those motors (washing machine, rteadmill) are AC. a powerful dc motor will be something from a wheelchair motor to a windshield wiper motor
Title: Re: DC Motor
Post by: airman00 on January 29, 2008, 06:18:40 PM
wheelchair motors are pretty inexpensive if you search on ebay and are very easy to mount

Title: Re: DC Motor
Post by: gan02340765 on January 30, 2008, 03:02:11 AM
first, the motor requirement voltage shall not more than 12v , coz i use mircocontroller to preform the DC motor...
second,the motor shall be high torque and the speed shall be faster than power window..
third, if u all been join competition before, the motor mz be easy to mount.
can i have a sample picture of wheel chair motor? i didnt see it before ...
thanks
Title: Re: DC Motor
Post by: ed1380 on January 30, 2008, 03:06:20 PM
it doesnt matter if the motor is over 12v. you'd just need a 24v h-dridge or higher if necessary

you cant have torque and speed.
torque, speed, price-. you can only pick 2
or
torque, speed, 12v- pick 2

you can make  motor mount easily. just get some flexible metal and clamp it around the motor

wheelchair motor pic- use google (http://images.google.com/images?sourceid=navclient&ie=UTF-8&rls=GGLR,GGLR:2006-48,GGLR:en&q=wheelchair+motor&um=1&sa=N&tab=wi)
Title: Re: DC Motor
Post by: gan02340765 on January 31, 2008, 12:29:11 AM
i think i need the torque most, coz the robot 10Kg ...cheap DC motor cannot support it ...that why i need advise from u all, maybe some of you use this kind of motor before..
what flexible metal do u introduce me to use to clamp the shaft??
Title: Re: DC Motor
Post by: ed1380 on January 31, 2008, 12:35:43 AM
strip of sheet metal.

windshield wiper motor might do for a 10kg robot. others will know more than me about that
Title: Re: DC Motor
Post by: gan02340765 on January 31, 2008, 10:30:03 AM
can u tell me is what kind of metal ? Al ? Cu ?
hmm ..thank for ur advice...i try and use that motor ..
Title: Re: DC Motor
Post by: ed1380 on January 31, 2008, 03:14:16 PM
aluminum probably no, but any kind of piece of flexible metal about 1/16" thick

heres an interesing link http://www.loganbot.com/bot_tips.html#drive
Title: Re: DC Motor
Post by: gan02340765 on January 31, 2008, 07:47:41 PM
thank guy..i didnt try to use any metal to clamp the shaft and the the wheel...before that, i jz drill a hole between it and lock it...
Title: Re: DC Motor
Post by: ed1380 on January 31, 2008, 08:12:46 PM
huh? the sheet metal is to mount the motor to the base/frame
Title: Re: DC Motor
Post by: gan02340765 on February 01, 2008, 05:53:27 AM
i cant get ur point lah... any picture to show me ?
Title: Re: DC Motor
Post by: ed1380 on February 02, 2008, 01:05:01 AM
i cant find one. even though i saw it not too long ago.
hope this helps.
Title: Re: DC Motor
Post by: SmAsH on February 02, 2008, 01:22:05 AM
is that a brace?
Title: Re: DC Motor
Post by: ed1380 on February 02, 2008, 02:09:38 AM
picture is side view. green part is the sheet metal i've been discussing. it's supposed to be tight around the motor
Title: Re: DC Motor
Post by: SmAsH on February 02, 2008, 03:13:55 AM
ohh ok well if it were me i would put a smidch of super glue just for extra hold.
Title: Re: DC Motor
Post by: gan02340765 on February 02, 2008, 07:58:34 AM
it quite a good idea also... i would like to try it if i have chance...
anyway , thanks ...
Title: Re: DC Motor
Post by: ed1380 on February 02, 2008, 09:35:07 AM
haha was looking through the forum and theer was a thread about a robot.
guess what kind of motor mounts it had  ;D


(http://tlb.org/scooter-guts.jpg)
Title: Re: DC Motor
Post by: Admin on February 03, 2008, 05:16:52 PM
Quote
any DC motor suggestion that have stall torque 10Kg above
Quote
coz the robot 10Kg
what really shocks me is that not one person has noticed that 10kg is a weight - not a torque!

This is a FAQ question:
http://www.societyofrobots.com/robot_faq.shtml#select_motor

All of you really need to read these two tutorials:
http://www.societyofrobots.com/mechanics_statics.shtml
http://www.societyofrobots.com/mechanics_dynamics.shtml

And then use this calculator to determine what motor is good enough for your robot
http://www.societyofrobots.com/RMF_calculator.shtml

Lastly, gan02340765, its a bit difficult to read what you write. Pls dun randomly abbr ur q's. ;)