Speed controllers to use with mobility scooter motors?

[terry]

I've run 24v ampflows on 33.3 volts 9cell a123 for years no problems.

[typhoon_driver]

I'm assuming that's in a drive application Terry? A spin up motor on a disc will be under a hell of a lot more stress than drive motors if you are gearing it for high top speed. That's the issue running the mags on higher voltage. Higher voltage = higher current = higher temperatures

[terry]

Yes it was the drive motors.

[maddox10]

With a decent gear reduction I suppose.

[supernova]

Ive had Vyper Speed controllers on order from robot marketplace for months now and they are still on back order. what other options are there for speed controllers? these will be for drive motors.

[typhoon_driver]

http://www.robotmarketplace.com/prod...GEBRIDGE2.html

[supernova]

I Know I know, but doesn't seem to handle much current, running out of options now anyway so may have to get the rages.

Got my mitts on some brushless controllers recently too

[typhoon_driver]

You don't have a rammer though. If your gearing is right then you shouldn't be drawing a huge amount of current on the drive. From what i've heard they have handled drive systems well in the US. I'm planning on dumping the vantec for one if I can afford it in due course.

edit - brushless is fun and potentially promising but I just don't see the reliability there. As you lose a match instantly if you lose drive then it's not attractive to me.

[supernova]

I think its not clear how much current a rage bridge will handle. If its 40A per channel and you put both channels together to drive one motor I would assume its 80A. I used to run supernova on 4QD pro 120A controllers and they used to get very hot running bosch motors at 30V. Though supernova is 2WD, when it turns it swings around the disc ie skid steering.

I'm planning a new robot too which will be 4WD.

I think brushless is the way to go in the long run, just having a tinker currently.

[typhoon_driver]

My question would be how accurate the 4QD ratings were

[supernova]

Yup good point, i'll give the Rage bridges a go then. Sick of waiting for a controller.

[typhoon_driver]

From what i've seen the guys that made the rage bridge are happy to discuss the ins and outs of it. Maybe if you get in touch with your planned set up they could advise if it would be appropriate or not?

[RogueTwoRobots]

I think there's still a backlog being caught up on from the multiple Battlebots and Robot Wars teams that emptied the stocks. An alternative option that is similarly priced is the IFI Victor/Vex 885. Handles 120A continuous and 200A bursts if I remember rightly.

Edit: here's the link; http://www.robotmarketplace.com/products/IFI-V885.html

Planning on using these myself, purely because I have a 60A version already as a spare. Slightly cheaper than the Vypers but you do have to get the PWM cable as well. The fan blades are prone to breaking from shocks so you'd be as well removing them, saving a bit of space. Biggest thing to watch is that the FETs don't touch, otherwise it's bye bye controller/repair time.

[harry hills]

Ive got a pair of ragebridges for fw use and they are really neat things.

[supernova]

The IFIs seem similar to the vypers... I like them too for the current handling ability, means I can use them for other more current hungry robots in the future. No BEC though, that's a pain. Thanks for the advice folks, will have to decide soon.