High power drive motors

[mattsdragons]

That's a shame, but I may try and order 4 clone motors as Doorstop showed it could be put in weight

[Danjr1]

all i can say is that it is possible but consider the weight very carefully in the design stage. It generally depends on what you want from a bot. a two speed 900 driven bot will easily push 13.6kgs about and thats the general direction I'm going with doorstop now. the weight saved can go on armour and/or weapon.

Personally, I would say go for Gimsons if you're using a weapon and the speed 900 route if you're build a wedge/rammer.

[maddox10]

Mario... Borrowed a speed 900 of another roboteer at champs.... It looks similar but output shaft seemed a tad bigger dia, and the rear of the motor had more shaft exposed... Is that a Johnson? Just out of interest.

I got a several of 5 pole johnsons (got them from a US source). Those have a 1/4 shaft (6.35mm, got the drill and reamer for that).
And yes, it's perfectly possible that Johnson made a series with a longer shaft.

[Eventorizon]

Could you get away with running a speed 900 off 1 Electronize ESC, the FR30HX model, or would you have to move to Victor 883's.

[typhoon_driver]

it should be able to handle it if you do the external relay modification to it

[PJ-27]

The Speed 900s want something like 40a continuous to run at full power.

You could probably run them with lesser ESCs. but they'd get rather warm and why fork out for a Speed900 if you're then just going to starve it of potential current. Might aswell get a cheaper motor.

Besides the amount of problems people have had with Speed900s breaking this year has been crazy! If I was forking out £100 for a pair of motors I'd expect more.

[Danjr1]

it should be able to handle it if you do the external relay modification to it

Who could do this mod? Mega interested in this!

[typhoon_driver]

You can. You just have to desolder the current relay in place and then switch it out with two 40A automotive relays. Getting the wiring right can be the trickiest part but it's not that much of a ball ache

[PJ-27]

The relay that pokes out the top yes?

This sounds nice and Bitza! I'm assuming you'll need 2 relays per ESC, but could you use 1 5pole Switching relay instead?

[typhoon_driver]

Lol it looks like the old ways have been forgotten! Yeah you need two relays to do the swap out. Basically unsolder the 8 pins from the current relay, solder in wires to each of the 8 connections and then wire them up appropriately onto the relay with the coil side and the power side. There used to be a guide kicking about somewhere that i'll find if i have the time.