Redneck motor controller......

[DMCdesign]

I just got an idea......

how about hooking up a fan speed controller to an over- volt/load regulator to make a cheap motor controller?

 

[itsid]

depends...

the fan speed controller in my cheap fan is nothing but a variable resistor.
that wouldn't work

If your's depends on hall sensing or back emf and is pulsing the power,
it might be worth a try.
On the other hand you still need the required amount of mosfets...
to run the motor *shrugs*
hmmmm
maybe it still wouldn't work (well not cheaper than a DIY controller up for the task)

You have something specific in mind?
(ippp [if possible post pictures] )

'sid

 

[DMCdesign]

well, I dont understand what you mean......

but I mean a variable speed controller that could work as a throttle.

the rest is no sweat- I know a pcb designer to work with.....

 

[itsid]

See,
and I mean that I don't have nor have seen a fan speed controller that is not just a resistor set up yet.
Those will not work!

And your second go:
"a variable speed controller that could work..."
well of course that could work
But do you know any... since I don't.

Maybe expensive power drills *shrugs*

What you need is a motor controller with PWM (pulse width modulation)

Then you can beef it up with the correct amount of MosFets to provide the power you need for the motor.

But honestly I think it's less hassle to just DIY it all,
get plans from maybe OSMC or any other open motor controller project.
There is even one nice home made motor controller here on DIYGK.

'sid

 

[DMCdesign]

the controller I am talking about can work like a throttle. the more you turn, the more voltage is supplied

and these days, a good resistor is a piece of cake to be DIY'Ed

think about it.

'design

 

[ML-TOYS]

Ok i will say it now, i have not seen a VARIABLE speed fan controller.
All i have seen and used is "click to low speed" next "click to medium"next " click to high"

 

[Troikos]

You don't want to vary the voltage on the motor. This isn't how motor controllers work. You want to change the duty cycle of the input signal. That way you get (almost) full power with a variable speed.

Changing the voltage on the motor will make it incredibly weak and the 0-80% range of your throttle will be practically useless.

 

[DMCdesign]

allright Troikos.

now tell me- have you built any controller? I would love to see it!

'design

 

[Troikos]

Actually, I have. What you are looking for is an H-bridge circuit. You can then drive the H-bridge using a PWM signal. This will give you maximum power across an adjustable speed as well as being able to change the direction.

A google search will give you more than enough examples. Choosing the right mosfets for your motor size is important as you will need ones that will handle the current.