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Topic: 10 Amp motor speed and direction regulation (Read 2184 times) previous topic - next topic

Plecharts

Hi, i want to control my RC car with arduino, so I need to control motor's speed and direction. Because motor draws about 10 Amps, I cannot use H-Bridge. Is there any easy way to do this?

mspguy

H-bridges made of discrete components can handle a lot of current.

Your RC car should have an H-bridge in it already.  Cannibalize that.

retrolefty

#2
Dec 27, 2010, 11:30 pm Last Edit: Dec 27, 2010, 11:33 pm by retrolefty Reason: 1
H-bridges at that current level are available, just a little pricey and possible larger then will fit in your car. If you don't need reverse for the car then speed control can be simple and inexpensive using a logic level mosfet transistor of suitable voltage and current rating and driving it with a arduino pwm output pin. It's not known to us how your car presently controls it's motor speed and if it could be modified for Arduino control or not.

Lefty

mspguy

Even if you do need reverse, its just three more FETs to get an H-bridge.  10-20A FETs can be found for 0.50-1.00$

westfw

10A+ DPDT relays will reverse direction (occasionally and not quickly; probably fine for fwd/reverse.)  It's probably a toss-up whether that would work out cheaper than a "real" H-bridge...

cr0sh

Quote
10A+ DPDT relays will reverse direction (occasionally and not quickly; probably fine for fwd/reverse.)  It's probably a toss-up whether that would work out cheaper than a "real" H-bridge...


You could control forward and reverse that way, but without adding an extra relay, you couldn't control on/off! So, it would be better to use a couple of SPDT relays instead of a single DPDT...

You wouldn't have PWM control, but you might be able to put on the low side a power FET or transistor, and PWM that, and switch direction with the relays; the whole thing could probably be done under $15.00 USD...
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

Plecharts

I have completed that using tamyia TEU-101BK controller, which is just 4 MOSFETs and it even supports PWM. It is a little bit expensive (30$), but I have it from RC car I am hacking, so why not?

cr0sh

#7
Dec 28, 2010, 11:43 pm Last Edit: Dec 28, 2010, 11:43 pm by keeper63@cox.net Reason: 1
Quote
I have completed that using tamyia TEU-101BK controller, which is just 4 MOSFETs and it even supports PWM. It is a little bit expensive (30$), but I have it from RC car I am hacking, so why not?


Well, ok - but why did you post here to begin with if you are just using the controller it came with (as mspguy noted)?

:-?
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

westfw

I meant that a DPDT relay would add "reverse" to a conventional single-direction speed controller...

cr0sh

Quote
I meant that a DPDT relay would add "reverse" to a conventional single-direction speed controller...


Ah - gotcha...

;)
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

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