Quote Originally Posted by battwell View Post
No need- its all done in the dual stage vfds i have! perfect 380v. under £400 so why mess about. i have them running hsd spindles and a big hydrovane in my workshop for over 2 years now. i test all spindles i sell using the newer ecogoo 9100 :-)
its the only one that can output to the frequencies i require - standard up to 650 hz and special order to 800hz
Finally found a link to the inverters on Aliexpress (https://www.aliexpress.com/item/VFD-...836555598.html)
And the full range can be found on ecogoo website at http://www.ecogoo.com.cn/product-category/220-380
There seems to a bit inconsistency with their model numbers though, but if you get the model number for the size of inverter you'd like on the ecogoo site, searching for it on aliexpress narrows the results.

Some do seem to need derated though. The 7.5KW mentions on the aliexpress listing that it's only suitable for up to 5.5KW motors.

I might get one to try on my big mill, as that's next on the retro list.