[ihavenofish]

so I had a thought. need some input as to weather is can work at all.

ive got a novakan and its came with a samutan bldc drive and motor. the drive was crap, and blew a long time ago (everyone knows the samutan story by now id imagine). i replaced the spindle with a high speed motor spindle in the meantime.

but I have this motor sitting there and another project requiring a motor, and was wondering, would a brushless esc with the correct voltage make it run? I know it wont have good low speed characteristics being sensorless, but it should still make it turn right?

I don't have any esc's handy here to give it a try except one from a micro plane. 7.4v 3 amps. I don't think that's gonna even turn it (or with it?)

anyone have any thoughts?

[bhurts]

Automation technologies is selling a new version of those motors and controllers again. I don't see the drive listed as a option but it may be worth contacting them to see if they can provide just the drive for you.

Ben

[Al_The_Man]

3amps seems very low current for a RC ESC?
Also they are typically very low voltage - High current, 10-30amps.
You are better off looking at a A-M-C or other BLDC drive on ebay.
Al.

[ihavenofish]

3 amp is for a micro plane. motor is less than 1cm diam.

but yeah, I was just wondering if it would "work". I am finding that as you get to bigger voltages (even just 60v), the drives become expensive to the point the industrial ones are only slightly more money. none of the sub $50 do more than 24v or so.

[ihavenofish]

3amps seems very low current for a RC ESC?
Also they are typically very low voltage - High current, 10-30amps.
You are better off looking at a A-M-C or other BLDC drive on ebay.
Al.

hmmm.

so I looked at the amc drives. they are all a tad expensive for this particular motor. the cheap ebay ones seem to all be 60 or 80v dc operation.

I was looking at vfd's that do permanent magnet motors. would this motor be compatible? or is a bldc different enough to not work. I guess they are wound differently from an ac servo.

[Al_The_Man]

A BLDC motor is usually wound identical to a AC sinusoidal servo, (BLDC are used for servo's also).
A BLDC motor has a three phase wound stator with a P.M. rotor, and timing pulses to commutate, either Hall or encoder pulse equivalent.
A while ago I contacted Hitachi, that claimed they had a BLDC compatible VFD, they came back that the VFD would have to be custom set up for a particular motor, unfortunately.
Incidentally modern HVAC system use a brushless P.M. ECM fan motor (Electronically Comutated Motor), but the electronics are dedicated and built into the motor itself.
Al.

[ihavenofish]

hmm.

yeah, the cheap pm compatible vfd's seem very... not ideal. there are some nice ones with encoder feedback, but they cost $600+. they are effectively an ac servo drive.

cant win here, haha.

theres some temptation to try and reuse the original driver and give it a new brain, but that might be beyond my electronics abilities (it seemed to be beyond the manufacturers abilities as well!).

[ihavenofish]

oooh, found a servo drive that may work with my siemens servo motor for $100. gonna look into that. if it can work its far better than this samutan thing. the siemens will hold 6nm at 4000rpm for 2.5/10 min cycle. kinda perfect for a spindle with a 2:1 pulley.