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Hi to all, im a new member of this forum. Sorry for my english but im italian, i come in this forum beacuse there arent italian robots forum.
Im build a robot, i have 2 motor of a wheelchair, i want to build the speed control.
someone can explain to me how to build it.
thx
In English:
Not trying to offend you but building a speed controler for a heavyweight is very difficult unless you just want on and off control.
Unless you are an electronic engineer I would not try to build a proportional speed controler.
Here is an on off reverse speed controler diagram by bugs:
http://www.bugs.nl/media/source/projects/speedo/relay-layout.jpghttp://www.bugs.nl/media/source/proj...lay-layout.jpg
Regards
Ian Mc Donald.
Ed in italiano
Sta provando ad offenderlo ma sviluppando un controler di velocit per un heavyweight molto difficile a meno che desideriate appena il controllo avanti/stop.
A meno che siate un assistente tecnico elettronico non proverei a costruire un proporzionale accelero il controler.
Qui ¨ sopra fuori dello schema dinversione del controler di velocit dagli Bugs: http://www.bugs.nl/media/source/projects/speedo/relay-layout.jpghttp://www.bugs.nl/media/source/proj...lay-layout.jpg
Considera
Ian Mc Donald.
would a speed controller relying on a servo and microswitches pass a tech check?
hear my latest efforts to develop a speed controller http://www.chompalot.co.uk/motorcont1.htmwww.chompalot.co.uk/motorcont1.htm
Si
You could try ...
http://www.zapiweb.com/mainita.htmhttp://www.zapiweb.com/mainita.htm
They might be generous and give you a couple.:)
Or purchase some from http://www.technobots.co.uk/en-gb/dept_68.htmlhttp://www.technobots.co.uk/en-gb/dept_68.html
As long as you use a failsafe on the servo a relay drive system will pass the techcheck. Ive seen several fethers and heavys running on relays.
thx very much.
It is possible construct a circuit to connected directly to the receiver, to creat an on off reverse speed control??
Just use a servo such as this:
http://www.sussex-model-centre.co.uk/B305%5FServo-4834.htmhttp://www.sussex-model-centre.co.uk...Servo-4834.htm
That is what the white cross represents. You will also need one of these on each servo:
http://www.sussex-model-centre.co.uk/FS%2D1%5FFailsafe%5FUnit-1402.htmhttp://www.sussex-model-centre.co.uk...FUnit-1402.htm
Also available from:
http://www.technobots.co.uk/index.html?target=dept_229.html&lang=en-gbhttp://www.technobots.co.uk/index.ht...tml&lang=en-gb
Regards
Ian
Fredrico have a look at this thread...
http://www.fightingrobots.co.uk/discus/messages/13/3753.html?1109164066http://www.fightingrobots.co.uk/disc....html?11091640 66
Have a look at the middleweight section. My idea to use the original wheelchair controllers worked by servos was best, of course.
can you give me the link or the name of your discussion thx
Extreme Fighting Machines » Light and Middleweights » Some general tips please
i have decided, i contruct this circuit:
http://www.bugs.nl/media/source/projects/speedo/relay-layout.jpghttp://www.bugs.nl/media/source/proj...lay-layout.jpg
but I dont know the type of the rel¨, can you says me the type. thx
You are using wheel chair motors so you would need something like:
70amp SPDT relays (sometimes called 70amp SPCO relays)
Regards
Ian
The wheelchair motor generate 70amp at 24volt???
thx, what means SPCO?
SP means single pole, which means there is one moving contact in the relay. CO means change-over, which means the moving contact moves between two contacts. One is connected to the moving contact when the relay is off, the other is connected when the relay is on. You can also get SPNO relays in which you only get a contact when the relay is switched on. You really want the SPCO type if you want to build a motor controller.
ok, thx for the help.
I have a doubt, the microswitch resist at high amps (70 for example)???
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 :)
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 ;)
ok, i think that i ask in a italian forum for the elettrical question.
peter have you got an image of the circuit
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.
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.
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
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.
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.