High voltage & high power servo drive design

[hunserv]

Hi, I'd have some questions.
-I sadly see on yor site, that VSD-A is no longer produced. does it mean that some new is coming out soon?
-Within this planned modular design, are you planning a powerstage which supports regenerating to supply?
-Will the new design have the same PID algorithm as previous ones?
-Is there any reference where we could see which exact PID scheme it uses? (hopefully not the "textbook" basic one, but some more advanced, as differential term acting on feedback signal only, etc...)
-Are you planning some more features, e.g. making real-time motor-load outputs (I asked it earlier)

Thanks,

Aks

[Xerxes]

Originally Posted by hunserv Hi, I'd have some questions. -I sadly see on yor site, that VSD-A is no longer produced. does it mean that some new is coming out soon? -Within this planned modular design, are you planning a powerstage which supports regenerating to supply? -Will the new design have the same PID algorithm as previous ones? -Is there any reference where we could see which exact PID scheme it uses? (hopefully not the "textbook" basic one, but some more advanced, as differential term acting on feedback signal only, etc...) -Are you planning some more features, e.g. making real-time motor-load outputs (I asked it earlier)

-Yes, we should get VSD-E final protos on week 32 and the first production run soon after that.

-Regenerative braking "shunt regulator" can be built without help of drive logic. However, one output pin could be assigned for regen brake control if needed.

-Same PID but also a PIV algorithm. I try to find time to document both well.

-Hardware doesn't have analog outputs. Digital output pins could be used to monitor conditions (follow error warning for example). SPI bus can be used for monitoring, too.

[neilw20]

A phase controlled SCR bridge can be made for peanuts and handle enough to blow the wiring off the wall without failing.
Ultra simple drive, no big capacitors needed. Just a few snubbers.

Do you need full 4 quadrant control, or is reverse with a switch/contactor OK?

Any comments?

[nicad]

Originally Posted by Xerxes ...Attach an lead screw to the moon and use servo motor with VSD drive to crash moon on earth near light speed. No damage to VSD will happen due to continuous current control (unless drive gets crushed by the moon).

So, at this point someone is suppose to jump in with all the numbers required to accel the moon to near lightspeed before it hits the earth, and how much energy that would require given the mass of the moon, and then congratulate Xerxes on building a drive that can output that much power.

[Xerxes]

neilw, SCR drive is Ok for turning pulleys in spindle and other raw power applications, but not for positioning servos. No enough control bandwidth.

--

The moon acceleration might require a few VSD's connected in parallel

[neilw20]

Xerxes..

Oops... too late here. I missed the thread (of things) Go fast IGBT's driven by IR parts. in a H-Bridge.

[hunserv]

SPI bus monitoring is OK, too imho, and if someone wants analog can hook a microcontroller on it

And some more questions...
-When do you think you will have time to describe these algorithms?

-What development time do you predict for the modular controllers?

I am really keen on it, I can't say enough that I was impressed by the performace/cost ratio of the VSD-A

As I see most guys here are beyond the hobby-category, (low power) but there are still few freaks like me, who need higher outputs, which are closer to the industrial grades...

[Xerxes]

Originally Posted by hunserv SPI bus monitoring is OK, too imho, and if someone wants analog can hook a microcontroller on it And some more questions... -When do you think you will have time to describe these algorithms? -What development time do you predict for the modular controllers? I am really keen on it, I can't say enough that I was impressed by the performace/cost ratio of the VSD-A As I see most guys here are beyond the hobby-category, (low power) but there are still few freaks like me, who need higher outputs, which are closer to the industrial grades...

I'm doing my best to get detailed block diagrams in VSD-E manual which should be ready soon.

About VSD-Core I don't have any schedule yet. There are other things to be finished first. Product release date could be within a year.

[panaceabea]

xerxes did you get a chance to read my PM?