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-   -   PWM help (https://www.rcuniverse.com/forum/rc-robotics-autonomous-robots-490/10923815-pwm-help.html)

Daddysharky 01-23-2012 03:31 PM

PWM help
 
<span class="Apple-style-span" style="font-family: Verdana, Arial, Helvetica, sans-serif; "><table class="forumline" width="100%" cellspacing="1" cellpadding="3" border="0" style="background-color: rgb(255, 255, 255); border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-color: rgb(0, 102, 153); border-right-color: rgb(0, 102, 153); border-bottom-color: rgb(0, 102, 153); border-left-color: rgb(0, 102, 153); border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; "> <tbody> <tr> <td class="row1" width="100%" height="28" valign="top" style="font-family: Verdana, Arial, Helvetica, sans-serif; background-color: rgb(239, 239, 239); "> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tbody> <tr> <td colspan="2" style="font-family: Verdana, Arial, Helvetica, sans-serif; "><span class="postbody" style="font-size: 12px; ">Hi, I am new here and was wondering if someone might be able to help me with a question. My robot is homebuilt on wheels. I want to steer the bot with an electric window actuator (from a car) The motor turns much to fast to control so I want to use a PWM to slow it way down. My question is what size PWM do I need.(size =volt and amp rating)

Here are the specs of what I am using
~Sealed Lead-acid Batteries (12v12ah/20hr) 2 in series)
~Dorman 741-814 window actuator (Just the 12 volt motor!)
~DPDT switch wired for reverse to turn wheels left and right (servo attached to run remotely)

Links to products used:
http://www.energexbatteries.com/prod...ah%7B47%7D20hr

http://www.amazon.com/Dorman-741-814.../dp/B000E347L6

http://www.radioshack.com/product/in...ductId=2062530

Thanks for any advice. Also if you have a better less expensive approch I will take any suggestions.</span></td> </tr> </tbody> </table> </td> </tr> </tbody></table></span>

dknovick 03-16-2012 08:09 AM

RE: PWM help
 


ORIGINAL: Daddysharky

The motor turns much to fast to control so I want to use a PWM to slow it way down. My question is what size PWM do I need. (size =volt and amp rating)

Do you mean what size speed controller do you need?

You may want to start smaller. These places all have good kits and parts:
http://www.pololu.com/
http://www.trossenrobotics.com/
http://www.acroname.com/

Getting back to your first question. The size of the speed controller depends on the voltage and current required for your motors.

-Dave


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