Servo Purchase Recommendations, Yaskawa?

Looking to buy good servo motors and drives that integrate well with LinuxCNC. I'm not happy with the servos I have. The requirements I am looking for:

1. Run on single phase 240v (US residential)
2. Analog control (using 7i77)
3. Original motors were SEM/Parvex and were 3000rpm X/Y 3.95Nm (geared 20T:40T), Z 7.5Nm (geared 28T:40T)
4. Going on a 1996 Bridgeport TC-22 VMC (6000lbs machine)

I have been looking at Yaskawa Sigma 5's with the  sgdv-120a01a008000 drives and  sgmgv-13ada61 motors. Some quick questions:

1. Where is a reputable place to purchase these at a good price?
2. Are the ones sold on eBay from overseas legitimate or clones? Drive   Motors

Looking for good products not necessarily cheap products. And also service from the seller goes a long way in my book. Thank you in advance for the suggestions.

When you say make sure they are purchased as a set. Isn't it fairly straight forward with the Yaskawa software to tune the drives?

My complaints are well documented in other posts of mine. They are DMM. What are the two you see issues with?

The Sigma 5's have software for tuning with an auto feature. Should be a lot easier then the older drives.

I was also looking at Glentek  and a couple things stood out. Seem to have a very stream lined form factor for the drives and a wide variety of motor options. They are also a local company in my state which is appealing. Didn't see many posts about anyone using their products however but there is a good amount of used stuff on eBay so they are not an unknown company.

I've bought several sets of Yaskawa servo motor / drive from FA Parts, which is a machine breaker in S Korea. Obviously the older generations of the Sigma drives tend to be cheaper - I think we are now up to Sigma 7. They come in significantly cheaper than new and a similar cost to the likes of new DMM, Lichuan etc.Having said that, Yaskawa are "more professional" products.
www.ebay.co.uk/str/faparts/SERVO-DRIVE-A...?store_cat=456141017

Another source is IndustrialPartsShop although I've found they are better for things like ballscrews, harmonic drives etc. Some are unused but obsolete stock, which are ideal for the likes of us.
www.ebay.co.uk/str/industrialpartsshop

Thank you for the links. I'm looking for the single phase drives which seem to be unicorns.

I did see a couple places that mentioned some of the 3 phase drives can actually run on single phase but there was no mention of which ones.

For drives under 4kW or so, the inputs generally use passive rectification (as opposed to active PFC), so they are fine on either single phase or three phase as long as the phase to phase voltage is appropriate - they don't know or care either way. The input rectifier bridge has to work slightly harder with single phase, as you are only using 4 diodes instead of 6 but they are typically rated for that application anyway. Besides, unless you are running your drives at full rated power continuously, you won't be pushing them. Looking at the Sigma 5 manual, Yaskawa don't require derating for operation on single phase. 

I didn't find that in the manual. It will not lists a handful of small servo drives that can work on single phase. Did see this though:

That's helpful. So you need to check that your model has the Pn00B.2 parameter and it's a 200V Class drive if you really are stuck with 3-ph equipment. 

Most of the drives I've used have been 1-ph out of the box (Yaskawa VFD and servo) or will tolerate either 1-ph or 3-ph (Lichuan and DMM Tech servos).