Model Boat Mayhem

Technical, Techniques, Hints, and Tips => DC Motors (Brushed) and Speed Controllers => Topic started by: amber1 on August 16, 2012, 05:37:59 pm

Title: speed controler
Post by: amber1 on August 16, 2012, 05:37:59 pm

Hi every one
Does any body know of a low amperage DC brushed motor speed controller.
It needs to have a very low operating current reason for this is that it will be used for controlling a solar powered model so it cant take too much power.
Any help greatfully received.
Jim

   

Title: Re: speed controler
Post by: dodgy geezer on August 16, 2012, 06:09:04 pm

This is the littlest I know..
 http://www.r2hobbies.com/turborix-25a-brushed-motor-esc-electronic-speed-controller.html (http://www.r2hobbies.com/turborix-25a-brushed-motor-esc-electronic-speed-controller.html)

Unfortunately out of stock at the moment...

Title: Re: speed controler
Post by: F4TCT on August 16, 2012, 06:10:36 pm

ACTion may have something - http://www.action-electronics.co.uk/speed.php (http://www.action-electronics.co.uk/speed.php)

Dan

Title: Re: speed controler
Post by: Artistmike on August 16, 2012, 06:13:13 pm

Yes I would have thought Action too, the other guy with a possible D.I.Y solution might well be our member Krishna, this sort of problem seems to be right up his street...

Title: Re: speed controler
Post by: cos918 on August 16, 2012, 06:38:54 pm

try some of the indoor flight esc from germany there only a few grams so dought they will pull much amps

john

Title: Re: speed controler
Post by: Tug-Kenny RIP on August 16, 2012, 07:33:10 pm

It will actually be the motor that demands the Amps, so all you are worried about is the weight of the Speed controller.    :}

Title: Re: speed controler
Post by: CF-FZG on August 16, 2012, 08:00:54 pm

Jim,

What voltage are you looking at using?
How much current do you think you'll be drawing?

The reason you're getting so many different answers is because you've asked the 'ESC' version of 'how long is a bit of string' ok2


Mark.

Title: Re: speed controler
Post by: malcolmfrary on August 16, 2012, 08:54:29 pm

What sort of voltage are you expecting from the photo cells?  Thing is, a lot of ESCs are limited to 5 volts, then you need to figure out the current required for the control part of the ESC and the radio.  Most ESCs that can handle a high current motor will be just as happy controlling a low current one - that is the big advantage of PWM ESCs.  Provided the photocells can drive the motor with a bit to spare, the spare capacity will provide the current for the control functions.  Will it be forward only?  Will it actually need fine control?  A semiconductor only switcher (ie no relays) might do the job.

Title: Re: speed controler
Post by: Mad_Mike on August 16, 2012, 11:34:10 pm

a simple servo amp would do it i reckon

Title: Re: speed controler
Post by: ACTion on August 17, 2012, 12:00:07 am

http://www.action-electronics.co.uk/pdfs/P68A.pdf (http://www.action-electronics.co.uk/pdfs/P68A.pdf)
Weight 9gms without case. Full forward and reverse power. £21 plus P&P.
Suit yourself.
DM

Title: Re: speed controler
Post by: essex2visuvesi on August 17, 2012, 08:16:47 am

running via solar energy I would have thought a small brushless motor would be more efficient