Speed control help

[fede88]

Speed control help

ok, thx for the help.

I have a doubt, the microswitch resist at high amps (70 for example)???

[jim]

Speed control help

In the picture you linked to, the microswitches only switch on the relays. The 70 amps required by the motors only flows through the relays, not the microswitches.

I would also recommend you ask about this circuit on a general eletronics forum or newsgroup where there are more Italian speakers. Were all happy to help but most of us here are limited to speaking English, and with these high currents it could be quite dangerous if a mistake in translation occurred. Please dont take this as an insult to your English skills, they are a lot better than my Italian

[orac]

Speed control help

I designed a speed controller around the zn409 servo control IC for my first robot, Orac. The circuit is really simple and swaps a bank of FETs in where the servo would normally sit. To get reversing, there is an output from the chip that you can use to switch another FET in to operate a high powered changeover relay to reverse the motors. The ZN409 is now obsolete but I think you can still pick them up. Alternatively, I think you can redesign the circuit around the M51660L servo driver IC.

Have a search on google for ZN409 to see a few example circuits or search for ZN409 datasheet to get the full info.

It worked well driving the wheelchair motors on the robot. I used car relays for the reversing as I worked on a car producvtion line

[fede88]

Speed control help

ok, i think that i ask in a italian forum for the elettrical question.

peter have you got an image of the circuit

[orac]

Speed control help

http://www.roboterwelt.de/info/sheet/zn409.pdfhttp://www.roboterwelt.de/info/sheet/zn409.pdf

See figure 11


You need to beef up the output stage with lots of FETs though.

[craig_colliass]

Speed control help

Hi dose any one out there have any experience with Robot Power Sidewinder speed controlers. any advice on setting them up i have my robot with 24volts supplied by hawker batteries running bosch 750w motors.

[jamesb]

Speed control help

yes, im their uk agent, so drop me an email.

i run wheely big cheese on 24v of hawker battery power, with a similar motor type. My other heavyweight runs bosch 750s and hawkers, so Ill likely be putting a sidewinder in it soon, if you want to wait for real test data I should have this done before the UK champs?

Leo runs bosch 750s on 36v and he is happy with the controller (as far as I know)

I can talk you through a basic setup on email if you like.

cheers

[leorcc]

Speed control help

I am still happy with the sidewinders. There are 2 other roboteers in the Benelux who run them on Boshes on 36V, and 1 more on the way.

I will be running the new Splinter on a Sidewinder too, but on 24V.

[big_nipper]

Speed control help

We run Little Hitter on a sidewinder at around 36V (depending what battery pack my brother puts in the robots) also so far without problems on 36V drill motors but this is a featherweight.