Diy Brushless Spindle

[njhussey]

Made some progress on this after concentrating on helis for the last goodness knows how long. The amount I've spent on helis recently I probably could have built a reallt top notch router by now.....oh well still having fun with the helis so not too worried :D

Anyway....below is the progress I've made with the spindle housing, will dig out the bits from the box in the cupboard tonight and see if I can put it together tonight (minus the bellville washers as I've forgotten to order them!!)

[njhussey]

Here it is roughly assembled....I know the shaft is sticking down by 12mm ish as I've not put it all the way in the motor bell, see last pic! I'm waiting on getting some Bellville washers then I can finish it off :)

[blackburn mark]

I'm waiting on getting some Bellville washers then I can finish it off :)

i could have sworn i sent you some

[Tenson]

Brilliant work :)

What is your PSU?

[njhussey]

Brilliant work :)

What is your PSU?

I can't take any credit as I followed what blackburnmark did, ok I adapted it a bit but the principle was the same :)

I'm going to be using one of the cheap 40A 24V psu's from eBay...

[njhussey]

i could have sworn i sent you some

B***er...can't remember getting any...I did move house back in March tho so maybe they're there?

[blackburn mark]

i think they where sent in may... PM sent

[njhussey]

PM replied to Mark.....

I've got 150 off P188207 Belleville Washers coming early next week so think I should have enough for this and any other spindle I might be wanting to do :D

[m.marino]

Question to you guys is how well do the DC motors handle heat when running at different RPM's? Also would setting up a PID type closed loop controller work with a DC motor? Looking at options with one of the other members and a DC brush-less motor is looking like the best option for providing the need power and from the looks of it the needed RPM's as well. Has anyone though of side mounting the motor and connecting it via belts to the spindle (possibly using a key way to help lock the pulleys to their spindles). This would some variance in torque and from what I can see would really make the spindle have a rather wide range of uses.

Just asking as kicking around ideas and designs and these are points that have run across. Anyone happen to know a source for variable speed AC motors in the 1.5kw range that don't cost the moon or come from questionable quality control?

Michael

[Jonathan]

I'm not sure if you're referring to the motors discussed in this thread, which are brushless AC motors, or normal DC motors? Either way a PID control algorithm can be used to improve the performance. A DC-servo motor is just the motor with encoder and PID control for position and speed.