Speed controllers

Ben, how many wheels do you want to use?
And what size of wheels?

The speed 900s, if bought at a normal RC shop- as they are normal, large RC motors are about £30 each.
Advantages. All stats are know, they are simple, rugged motors with build in radio interference suppression. And not that difficult to aquire, any decent RC shop can deliver them.
But their main disadvantage for heavyweights is the high RPM and low torque. @12V they run about 7000rpm and have 1.1Nm stall torque.
All this for 665 grams per motor.

8 5 inch wheels with skid steer hence need for 8 motors

What speed is wished for?
And, what voltage intended?

And imagine your robot being an 4 legged chair... What amount of legs (wheels) is touching the floor at any time.

(Message edited by maddox on June 26, 2008)

15 Mph

Ill take 24V.

That means you need a 2 stage gearing of 13.5-1

I can already tell you, a simple single stage but custom gearbox with aluminium gears suited for a feather, without a motor, is approx £40.
And thats not even commercial, but a price between roboteers.

Imagine a 4 times higher price for each. At least, for a heavyweight robot.

Hello!
What is the best speed-controller to use in a two wheeled robot driven by two S28-150 Magmotors?

The best, unaffordable.
Useable, about any current limited speedo we have seen used with succes in heavies.

I would use the Sidewinder.

I would not use a Sidewinder with Mags. Not even the 150s.

Id think about a Roboteq or similar.

RoboteQ ax2550..??

Will 120 A be enough for a 28-150?