A 10hp DC motor is unusually large for a 1 phase SCR drive, otherwise if smaller the KB/Baldor line would probably accommodate it, fairly cheap on ebay, also to have a wound field, usually means the motor is fatter than normal due to the field space?
Bit if you go with a VFD, most of the higher end ones offer both 1-10v and ±10vdc control, also for spindle applications it may be worth either getting one with a encoder feedback, or at least can have the option added later, this gives you a much better control of speed, especially at low rpm.
A 2 pole motor in the UK will have a base speed of just under 3000rpm, I would be leery of running either 2 pole or 4 pole over 3600~4000 rpm, unless you have a really well balanced motor.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.