Originally Posted by handlewanker  DC? oops, I must 'ave been thinking of real motors. Didn't DC die with old Tom Edison, or was that the incandescent blow torch? I can't remember, too far back. |
DC motors are far from dead, the older Gettys servo style motors that Fanuc & Mitsubishi used still come up on ebay and make excellent spindle motors, it is usually the controller that is costly.
But in your case, it you have a 3 phase spindle motor, 5hp or under, I would not bother with the RPC, just use a VFD with single phase in, gives you 3 ph out.
Al.