Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: Danish Boy on November 21, 2007, 11:48:12 PM

Title: Need PWM speed controller (help/opinion)
Post by: Danish Boy on November 21, 2007, 11:48:12 PM

Hi

I am looking for a couple of cheap PWM speed controller, I have looked at the L298 from Solarbotics controllers but before i order a couple I would like to hear someone else`s opinion on them, or if you have a a better choice for a speed controller plz let me know.

I'm running my motors at 14.8V and they are 2 amps stall

 http://www.solarbotics.com/products/k_cmd/ (http://www.solarbotics.com/products/k_cmd/)

and BTW if you have any used at home I'm interested, Email me at [email protected]

Thanks Danish Boy

Title: Re: Need PWM speed controller (help/opinion)
Post by: SomeSaba on November 22, 2007, 01:40:37 AM

good choice!

there's also the http://focus.ti.com/lit/ds/symlink/sn754410.pdf

with peak output current of 2A

but id go with the one you picked, you can heatsink it easier for bigger motors later on :)

Title: Re: Need PWM speed controller (help/opinion)
Post by: Admin on November 22, 2007, 10:56:27 AM

Quote

I'm running my motors at 14.8V and they are 2 amps stall

You don't want to run on stall for this motor driver.

I checked the L298 datasheet (http://www.allelectronics.com/spec/L298N.pdf) and the power rating is 25W.

14.8V * 2A = 29.6W

It will work for you as long as you don't go above ~1.6A. Consider adding a heatsink to the motor driver, too.

Title: Re: Need PWM speed controller (help/opinion)
Post by: Danish Boy on November 22, 2007, 04:00:11 PM

well its an omni robot, I'm building. so I'm properly never going to stall my motors for fore than a few seconds, if it will ever happen.

and I'm going to put heat sink in L298 if ill use them.

thanks for the reminder tho :)javascript:swapOptions();


and ill check out the TI chip

thx again