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PWM help

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Old 01-23-2012, 03:31 PM
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Daddysharky
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Default PWM help

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.
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Old 03-16-2012, 08:09 AM
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dknovick
 
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Default RE: PWM help


Quote:
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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