myothercarsa2cv Posted August 25, 2016 Share Posted August 25, 2016 Odd request, but you guys know everything! What's the best way to make an RC car motor slooooooow? I am working on a fun project: making an exorcist kid mannequin. I've butchered the RC car, got all the bits, and am almost ready to mount the motor in the body, but one thing I didn't factor in was just how fast these motors spin! Any ideas? The freer the better ;) I tried a resistor from the LED circuit (red red black gold, 22ohm?) in line with the motor and there was no movement... Could diodes be the answer? Link to comment Share on other sites More sharing options...
Jonathan Kay Posted August 25, 2016 Share Posted August 25, 2016 Thought it was going to be about slowing a competitor's!Chopper circuit, possibly using thyristors? (Is there a much more modern way of doing the same thing?)Jonathan Link to comment Share on other sites More sharing options...
Dr Slotter Posted August 25, 2016 Share Posted August 25, 2016 Might be easier to buy a stepper motor. Link to comment Share on other sites More sharing options...
Bricol Posted August 25, 2016 Share Posted August 25, 2016 Brushed or brushless?Lower voltage is the easiest, assuming brushed. Power output will drop of course. Otherwise, smaller motor, or gearbox. Link to comment Share on other sites More sharing options...
andy_h Posted August 25, 2016 Share Posted August 25, 2016 Why make it complicated.... use a gear to gear the speed down :) Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted August 25, 2016 Author Share Posted August 25, 2016 Cheers guys. Basically have zero budget for this build so a £5 RC car was bought! I assume it's brushed? Looks like a Scalectrix motor. Will look into those options, tried dropping down to two AAAs instead of 5 AAs, this has made a difference, tried 1 AAA and that didn't work at all. I wonder if there's a minimum voltage to prevent complete discharge of batteries? Link to comment Share on other sites More sharing options...
sjmmarsh Posted August 26, 2016 Share Posted August 26, 2016 2cvyou need one of these (or similar) from an old rc car. They never use them now because the electronic controllers are so much better and reliable. I may have one I took off an old car when I upgraded it. I'll have a look when I next go to my lockup. Stevehttp://www.tamiyaclub.com/pictureframe.asp?t=n&id=img16134_2A1TG_1.jpgI think the 200 ohm resistor is too big. The variable resistors are basically just wound wire. Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted August 26, 2016 Author Share Posted August 26, 2016 Thanks Steve! How does it wire in? Does it just sit between the PCB and the motor? Link to comment Share on other sites More sharing options...
jackb_ms Posted August 26, 2016 Share Posted August 26, 2016 The speed of a DC motor varies with the voltage supplied to the motor.I would used a battery with a lower voltage or use a voltage regulator.I have one f the speed regulator from a vry old Monster Beetle if you want .Jack Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted August 29, 2016 Author Share Posted August 29, 2016 Hi Jack,Thanks! I've already reduced the number of batteries down from 5 to 2, going to down to one and nothing works. Not sure why! That's very kind, and would be very useful! I'll drop you a PM and I'll see if I can get it working that way!cheers,John Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted August 29, 2016 Area Representative Share Posted August 29, 2016 Why make it complicated.... use a gear to gear the speed down :)My thought exactly Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted September 2, 2016 Author Share Posted September 2, 2016 Well Jack found me a 1000:1 geared motor for a fiver, which looks like it will do the trick! Let's see...!Thanks all for the input, been an education and the POBC is always a marvel! Link to comment Share on other sites More sharing options...
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