What's wrong with eBay, plenty of brush less controllers for r/c fraternity and cheap to boot. A simple servo tester will drive these boards giving you potentiometer control of speed. For more sophistication you could use an arduino board. 

Regards

Howard

From what I can find out the drive circuitry is effectively replacing a commutator which means the coils driven by this need to be stationary. The switching frequency controls speed and phase will set direction. A simple view.

I did try playing around with a relatively low rpm per volt model aircraft motor and driver but didn't stick a scope on it to see what was going on. I found that the speed regulation didn't seem to be too good but suspect that was the controller. I had wondered about using one to drive a tool post spindle powered by a redundant power supply intended for use on a server. There is info on getting some of these to run out if a server – some pins have to be shorted etc. One problem is the size of leads needed as the power goes up.

There is plenty of info on the web such as

**LINK**

I'd guess there will be info on using an arduino to do the basic drive about as well.

John

–

If you want to know the theory behind the control of BLDC motors, with and without a position sensor, check out these two links. Even if you don't want to build a controller from scratch, understanding the principle will help:

http://www.atmel.com/images/doc8138.pdf – sensor control

http://www.atmel.com/images/doc8192.pdf – sensorless control (the usual method)

(you need to read the first one to get the basic theory before reading the second one).

Neil

Edited By Neil Wyatt on 26/10/2015 18:35:37

my problem is lack of knowledge about electronics. The E bike controllers bristle with all sorts of input leads. I just want to be able to plug in a motor to a controller to a power supply.

Can anyone make it that simple please ?