DC motor Speed Control with high current and potentiometer

[Stefanus Adrian]

Hello

I need to make a circuit that can control the speed of DC motor, i'm basically a newbie at electronic so the only method i can think of is using a potentiometer, but because of a high power needed for the dc motor, it also needs a high current, and i dont really understand how to make a circuit that can control the speed at high current, so will you be kind enough to help me with this?

Thank you

 

[Minder]

You need a 555 controller, ebay have them cheap or here is a typical circuit, the motor power and Mosfet can be changed to suit.
http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm
M.

 

[73's de Edd]

The MAGIC numbers not being given, are the maximum voltage involved and the maximum current.
Without that info we cant ascertain if this is going to be a simple $20 build or will its complex power demands need $12,000.

 

[Stefanus Adrian]

The MAGIC numbers not being given, are the maximum voltage involved and the maximum current.
Without that info we cant ascertain if this is going to be a simple $20 build or will its complex power demands need $12,000.

Sorry for not mentioning it, its 12 Volts and 10 Amps, thanks

 

[davenn]

Sorry for not mentioning it, its 12 Volts and 10 Amps, thanks

OK as minder suggested, you are going to need a PWM controller also known as an H-bridge, plenty of them on eBay

you wont find pots that can handle 10 amps. The very few and very expensive pots that exist can handle an amp or 2 at most

 

[73's de Edd]

Sir Stefanus Adrian . . . .

Having built my own constructions for going on 75 years now and my MASSIVE accumulation is such that I would already have all parts .
BUT the aspect of design, board layout and final construction and then any de bugging . . . . . and then seeing that something like this being offered . . .this below would win out every time.

Here are multiple examples . . . from a basic boarded unit, on up through cased models.

ALWAYS overdesigning . . . . this is meeting 5 times your voltage and twice the current demands . . . for meeting any surprises as well as less component stressing.

Now . . . . . for your consideration:

http://www.ebay.com/itm/DC10-60V-PW...tch-20A-New-/331781985152?hash=item4d3fbf5380

http://www.ebay.com/itm/9-60V-Max-2...ariable-Speed-Controller-Switch-/302014786519

http://www.ebay.com/itm/9-60V-Max-2...ariable-Speed-Controller-Switch-/302014784443

http://www.ebay.com/itm/New-Max-20A...d-Switch-Controller-12V-24V-60V-/121975204863

There are several copycats of these, so just pick a sourcing in / near Singapore / Indonesia .


73s de Edd

 

[Minder]

I need to make a circuit that can control the speed of DC motor, i'm basically a newbie at electronic so the only method i can think of is using a potentiometer, ...i dont really understand how to make a circuit that can control the speed at high current, so will you be kind enough to help me with this?
Thank you

If you are interested in building one for the experience then something like the one on the Dave Johnson site can be made to work, this is how the majority of ebay versions are made.
You can wire a prototype up using something called Vero or strip board which subs for a printed circuit.
M.

 

[BobK]

OK as minder suggested, you are going to need a PWM controller also known as an H-bridge, plenty of them on eBay

you wont find pots that can handle 10 amps. The very few and very expensive pots that exist can handle an amp or 2 at most

An H-bridge is not the same thing as a PWM controller. A PWM controller merely turns the motor on and off at some frequency and duty cycle. It can be combined with and H bridge which allows you to reverse directions, but if you want to run in only one direction an H bridge is not necessary.

Bob

 

[tedstruk]

not a potentiometer... What you are looking for is "A Rheostat"

 

[davenn]

not a potentiometer... What you are looking for is "A Rheostat"

basically the same thing