I purchased a lathe with a 10hp motor. I am running it off a VFD with single phase 220 input. I now know after reading that I really should have bought a larger VFD then the 10hp rated one. But so far it is holding up fine with no errors and I have stayed below the current ratings of the drive.
The problem I have seems to be the motor. It runs fine at 60hz even taking a .300 DOC at .5 in/min. 217rpm?. The problem seems to arrive when I go much above 60hz. First I start to get a vibration in the lathe. Maybe a balance issue? I also loose torque. Taking the same DOC as above it will start to stall the motor. Also I can't run the lathe in the next higher gear even with no load as the motor will start to slow down and amps rise. Previous owner did say the drive pulley is bigger then OEM so the speeds are 15-20% faster then on dial. Just not sure if I need to look at a different motor or what, and if so would a 7.5hp be enough or I need to stick with a newer 10hp.
The problem I have seems to be the motor. It runs fine at 60hz even taking a .300 DOC at .5 in/min. 217rpm?. The problem seems to arrive when I go much above 60hz. First I start to get a vibration in the lathe. Maybe a balance issue? I also loose torque. Taking the same DOC as above it will start to stall the motor. Also I can't run the lathe in the next higher gear even with no load as the motor will start to slow down and amps rise. Previous owner did say the drive pulley is bigger then OEM so the speeds are 15-20% faster then on dial. Just not sure if I need to look at a different motor or what, and if so would a 7.5hp be enough or I need to stick with a newer 10hp.