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One other option Mark: get in touch with Roger Plant (http://www.bigcheeserobot.com/http://www.bigcheeserobot.com/) and see if he still sells the Curtis speed controllers. They were £50 each when I got mine (so £100 for both motors) and are easily powerful enough for wheelchair motors.
They take a 0-5V analogue input so youll still need an interface of some sort.
Ok ill consider that.
are these the kind of interfaces ill need?-
http://www.technobots.co.uk/en-gb/dept_78.htmlhttp://www.technobots.co.uk/en-gb/dept_78.html
http://www.technobots.co.uk/en-gb/dept_518.htmlhttp://www.technobots.co.uk/en-gb/dept_518.html
Try the MD22 rated @ 22 amps with a suitable heatsink NOT SUPPLIED .....plugs straight into your reciever and drives 2 motors.
Thats 500 watts of power @ 24 volts .....should be enough for your 50 kg bot.
The problem still is failsafeing and whether or not they are required by the competition.
A failsafe isnt required but a visible isolating switch is
Switch ...
http://www.vehicle-wiring-products.co.uk/VWPweb2000/battisol/battisol.htmlhttp://www.vehicle-wiring-products.c.../battisol.html
Note :- The 500watts mentioned in my previous post is I believe EACH motor WITH a suitable heatsink.
BTW ... What is the competion about?
Mark.I have a part built middle. Send me an e if your interested.
Ok thanks peeps.
Could someone please give me some tips for interfaces that work with these speedos. And whatis and how do i obtain a heatsink?
maybe i should say what our initial design is at the moment. We are going to use a flat cuboid type shape with bucket scoops on both ends, one inverted so we can allow for flipping and its also ideal for the obstacle which we must complete and for pushing people of the arena
Mark.
They DONT need an interface ....its as I said plug -n - play.
5. Control of the module can be any of;
a) I2C bus, up to 8 MD22 modules, switch selectable addresses and 4 modes of operation including steering..
b) 2 independent 0v-2.5v-5v analog inputs. 0v full reverse, 2.5v center stop, 5v full forward.
c) 0v-2.5v-5v analog input for speed ,with the other channel for steering.
d) independent channel RC mode. Motors are individually Controlled directly from the RC receiver output.
e) RC mode with steering, allows speed control with one stick of radio control, and steering with the other
Option e)