"DeusEx"

[Jonathan]

No need to explain I know all about torque vecter drives but are you sure these drives mean the same.? I don't see any referance to torque vector control but I do see current limiting (Half current).?

http://www.zappautomation.co.uk/prod...ec77476e499bf4

'The application of advanced vector control algorithm greatly reduces noise and vibration of the motors during operation, '

The link I gave in my previous post explains it better. In particular this is interesting:

'The motor operates in continuous mode rather than conventional stepping mode.The audible
noise and resonance effects associated with conventional stepping mode are effectively
eliminated.'

That sounds alike to the Gecko - although it's not full stepping at higher speeds it's applying a sine wave to each phase, so operating it like a 'normal' motor not stepper motor. Bound to be quieter and more efficient for obvious reasons.

I'm intending to implement vector control on the stepper driver I'm designing/prototyping.

If these are the motors with 3mh inductance I've seen specs sheets flouting around for then your running them approx 20V over spec, this will sooner or later have an affect.!!

Well it's been 16 months. I'll let you know if they break!
The formula you are probably using to say they are 20V over-spec (32*sqrt(L)) is almost certainly an oversimplification / guideline. I think the fact my real life experience with these motors shows the temperature is fine at 75V says it all.