running a large mill off a direct drive dc motor
Aug 04, 2016· But a series motor is unsuited to machine tools without a significant;y more complicated controller to maintain acurate speed as load changes. SERIES motor is best case, here, a DC shunt motor or PMDC is a straight proportion as described. Now, needing 20x torque with that 60 rpm would need 20x current in a AC motor, shunt DC, or PMDC.