Any one here have the circuit diagram and construction details of a stepper motor drive of around 42 volts DC, 3 phases, 500hz and a total of 900W from 240V single phase.
No its not for a CNC but for part of project I'm building in my shop.
I can work the frequency drive from a special PIC microcontroller. Its the drive circuitry.
btw Its a controller for a Turbomolecular pump. This forms part of high vacuum set up I building...
I got the pump in pallet of junk I bought at an auction for £30... I dont want to spend £500 on the controller .