[CNCAddict]

The Y-2012-2 only needs 45V to get to 1000rpm so the VSD-E should provide plenty of overhead before you reach voltage saturation. In other words it should work perfect.

[Xerxes]

Jason,

The motor specs say: voltage constant 45V/krpm. However, it doesn't tell how that is measured/specified. Is it a RMS voltage from phase tho phase or phase to neutral or what? That makes a big difference. It it is RMS L-to-L (which is my best guess) then it probably would reach about 1000 rpm at 80VDC supply.

Edit: found this spec: http://mms.rockwellautomation.com/id...m008_-en-p.pdf
It says it is L-to-L peak voltage, not RMS. So it probably runs over 1000 rpm at 80VDC.

[Jason3]

CNCAddict and Xerxes, that's good news - thank you very much for your advice.

Best regards,

Jason

[keebler303]

Any progress on the high voltage VSD-E?

Thanks
Matt

[Xerxes]

Matt, I have done the tests with high voltage prototype. It seems that it will require few additional components on board, which means additional costs in production. I have meeting with manufacturer next week where I'll ask about cost of changes.

[Eson]

Will the high voltage VSD-E allow the same or more current?

[Xerxes]

Eson, less. See couple of pages behind where are my current estimates.

[Xerxes]

I drew a small diagram explaining VSD-E step/dir input advanced features. It's on product page:
http://granitedevices.fi/index.php?q=servo-drive-vsd-e

I'm not aware of any other drive capable of doing that.

[keebler303]

Tero

The advanced step/dir looks pretty cool.
I am assuming that you setup the speed and acceleration by serial link ahead of time and it moves at that speed when the step input is pulsed?
Will this mode stop at the end of each segment or can it execute the next segment without decelerating?
Can you synchronize movement of multiple drives in this mode?
What niche does this feature fill that the SPI mode does not?

Looks Good
Matt

[Xerxes]

Matt,

It's supposed to be the simplest way to implement point-to-point applications where only final position matters, not the path. Most of position applications are like that and only few require controlled path (like CNC). SPI or other method should be used for complex apps.

Yes, parameters are set from GDtool. The advanced step/dir can't be fooled, one doesn't have to wait for move finish before new one.

[Xerxes]

The VSD-E stepper support is finally getting more finished. I managed to design extremely effective digital resonance damping which makes stepper very stable and quiet at all speeds. Resonance damping is non-existent in most drives in market.

The next step is to develop new kind of encoder feedback for unstallable operation.

[Xerxes]

A stepping motor accelerating smoothly from 0 to 9375 rpm. Notice that there is no single resonance frequency in whole range thanks to digital damping. In this test motor operates in open-loop and attached encoder is not in use. The drive operating at 65VDC.

If using drive's full resolution (25600 steps/rev), it takes 4 MHz step rate to do this.

[ame="http://www.youtube.com/watch?v=8cxl3B99MQQ"]YouTube - Stepping motor running at 9375 rpm[/ame]

[keebler303]

Nice work Tero!

Matt

[H.O]

That IS cool, nice work Tero!
I wonder how much torque there's left at that speed...

/Henrik.

[Xerxes]

"I wonder how much torque there's left at that speed..."

Not much. Such speed is inpractical for any load with friction. Best useful range with steppers may be between 0-2000 rpm. Stepper also get hot very quickly at high speeds because of high frequency and iron losses.

[Khalid]

Tero..You did it man

[Xerxes]

I finally got quotes & lead times from PCB assembly house.

Instead of making two separated versions (80 and 160V), we decided to go with a "super VSD-E" without making any compromises in current vs voltage range.

So there will be a 12...160VDC drive that outputs same continuous & peak current than current 80V version (making the drive twice as powerful as rev1 VSD-E). That was achieved by equipping drive with rugged state of the art 60A 200V MOSFETs. In the original plan we used 31A fets which could only deliver greatly reduced currents without heating too much.

We should be getting new drives in about 2.5-3 months from now. Due to more expensive components (and assembly house's price increase) the new version (rev 2) will be slightly more expensive than rev 1.

[asuratman]

Good day. I am just thinking where to find such big motor servo for this VSD-E 160, I have not found anybody like kellinginc offering big motor servo (more than 1125 oz-in). With VSD-E, I am happy that I have expectation to retrofit my cnc lathe Ikegay FX-25-N that have fanuc DC motor M5 (5 NM) and M10 (10 NM), that big motor servo may replace fanuc DC motor. Can VSD-E 160 drive this fanuc DC motor? If yes, so my retrofit become so easy.

[hunserv]

Hello!

What is the reason for not choosing IGBT-s for higher voltages?
I do not know about any drawbacks... IGBT-s can carry high currents, and withstand higher voltages than power-FET-s.

[Xerxes]

asuratman, there several motor manufacturers who make 90-150VDC DC servos. Also BLDC/AC motors can be ordered for that voltage to get higher power. I don't know any tech specs of those Fanuc motors so I can't comment on them.

hunserv, IGBT becomes more optimal above 200VDC. MOSFET is usually best below 200VDC.