Another questions for you guys:
Can I run a spindle rated for 1000Hz with 400Hz VFD?
I planned to keep using my existing VFD but have found two of the spindles I’m looking at to be the same 2.2KW 230V but to be rated for 1000Hz.
I’m still researching the details regarding VFDs and any input for this learning process is apreciated.
So at a European 230V50Hz power supply a 2 coil motor with a 400Hz VFD will run at a maximum of 20.000rpm. So for a faster 30.000rpm motor I need a 1200Hz VFD and ignore the 1000Hz in the spindled motor data sheet?
Damn… I was hoping to keep using my existing 400Hz Vfd. Now I have learned that I was running my existing spindle 5/6 too slow and displaying wring rpm.
The 50hz input frequency doesn’t change anything. You can run the new one but at 4/10 of it’s rated speed.
This is a #goodread and unexpected results from my assumptions.
Changing an Induction Motor’s Power Supply Frequency Between 50 and 60Hz
As we at Tractive prefer to base our designs on sound principles, the 1000 Hz motors where never an option. To make bearings survive in this tough environment is not easy and it will cause the customer problems in the long run. We run our motors at a base frequency of 400 Hz and we go up to 440 Hz as a maximum. Thereby we can make the bearings live longer and there is no need for frequent maintenance.
http://www.pentruder.com/Products/Wall-saws/HF-wall-saws/Features/400HZ-technology
• this is the 2nd resource saying running a motor below specs is a bad idea.
@Giligain_I that sounds fishy as bearing shave to widhstand the RPM and changinge the windings to get the same 30000rpm from 400Hz instead of 1000Ht changes nothing for the bearings.
I’ll have a to buy a new inverter that does 1000Hz and figure out how to control it via RS482 with Mach3 like the old one one… Adds a few hundred euro to the cost of the new spindle 
You can program the inverter to adjust the voltage to suit but you will be missing out on the top speed of it so if you need that you will need a new drive.
I got an offer for spindle, new VFD, cables, tubes,… . It will be a bit more expensive then I planned for. Will have to postpone a few other upgrades (stronger servo drives to replace the weak steppers, …).