Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: weijie on November 19, 2009, 02:09:25 AM

Title: mobile robot motor problem
Post by: weijie on November 19, 2009, 02:09:25 AM

Hi guys ,
I am currently doing a project using tamiya gear box with motor for my mobile robot.
The major problem that i face is that the motor don seems like able to run the robot.
Do u guys have any suggestion to solve this problem?

(http://photos-c.ak.fbcdn.net/hphotos-ak-snc3/hs051.snc3/13839_177635302538_731432538_2954162_2896174_n.jpg)

(http://photos-e.ak.fbcdn.net/hphotos-ak-snc3/hs051.snc3/13839_177636562538_731432538_2954163_8308323_n.jpg)

(http://photos-h.ak.fbcdn.net/hphotos-ak-snc3/hs071.snc3/13839_177636567538_731432538_2954164_5114463_n.jpg)

Is changing the motor a good way of solving?
Potential motor:
(http://photos-d.ak.fbcdn.net/hphotos-ak-snc3/hs071.snc3/13839_177632187538_731432538_2954145_1520729_n.jpg)

Please advice !

Title: Re: mobile robot motor problem
Post by: SmAsH on November 19, 2009, 02:54:51 AM

Well, if you mean the motor can't move the robot because its not strong enough. Then yes, you will need to upgrade the motor or reduce the robot weight.

Title: Re: mobile robot motor problem
Post by: weijie on November 19, 2009, 10:56:43 PM

I change the gear ratio from 58:1 to 208:1 , resulting in a higher torque and lower rpm. Problem solved  :)

What is the recommended way for bi-directional communication (wireless) with user controller ? i need to get some data from mobile robot while asking the robot to do some job.
I need some circuit/schematics .
Thank you !

Title: Re: mobile robot motor problem
Post by: waltr on November 21, 2009, 01:11:53 PM

For wireless it is best to buy RF modules as designing and building them is not trivial. If you need bi-direction communication then the choice is either modules with full bi-directional capability or modules on different frequencies one to send to the robot and one to receive from the robot.

SparkFun has various RF modules that would work.
http://www.sparkfun.com/commerce/categories.php (http://www.sparkfun.com/commerce/categories.php)

Title: Re: mobile robot motor problem
Post by: weijie on November 21, 2009, 09:38:44 PM

thanks for the infos . i will try and build first before sharing the results here  ;)