Can anyone help me with ideas for driving a med/large dc spindle drive motor, please?

[Muzzer]

Wow, that's quite a motor - 4.7kW at 6000rpm. Problem is, you need to drive a current in both the armature (rotor) and the field (stator) and be able to vary current in one or both to achieve speed control. Simply connecting them in series won't be a solution, even if you had a controller to regulate the current.

If you can't mend the original drive, you may be best to fit a modern induction motor and matching VFD. Are you likely to be doing that sort of power at full speed? It would be fairly shifting material.

[Mortattoo]

Hi Muzzer,

No, i would imagine that even if i could get half that power from this thing it would happily do what i want it to do! It really confuses me that this thing is feed from 3 phase 400v into the controller but is a DC motor!!

I have looked into controlling various motors before from brushless dc (esc type controllers) to VFD controllers for the normal 415ish type three phase stuff, but this one is extreme (from my personal perspective) and even just knowing where to start is a real issue!

Cheers,

Mort