can you point me towards a text or other reference, please?

There is some info here that may help, also Automation Direct sell a good quality drive.
https://www.automationdirect.com/adc/technical/catalog/drives/ac_variable_frequency_drives_(vfd)
Max.

 

There is some info here that may help, also Automation Direct sell a good quality drive.
https://www.automationdirect.com/adc/technical/catalog/drives/ac_variable_frequency_drives_(vfd)
Max.

Great website thanks Max. I Will get what I need there I reckon.

 

Yes , you can dispense with the gear box , as has been pointed out it's about VFD

The only limitation is at very low speed ... you just won't get the same end power

 

Yes , you can dispense with the gear box , as has been pointed out it's about VFD

The only limitation is at very low speed ... you just won't get the same end power

Maybe for this wood lathe, but it wouldn't work for any metal working equipment. And low speed is a problem with most induction motors and a VFD, the motor overheating is the problem. VFD's are best used to "dial in" a speed of a machine, where the speed is slightly off, not as a true speed control.