Originally Posted by
int1
I'm seeking getting higher torque than from a typical 24000 RPM 2.2kW spindle + VFD setup but don't need higher than 6000 RPM. Chinese spindles don't advertise torque so going back to first principles torque is related to power and rotational speed.
Torque (Nm) = power (W) / ( 2 * 3.1416 * RPM / 60 )
List of common available spindles @ voltage, phase current, and ideal torque:
[220V round spindles]
Spindle 1500W 24000rpm 0.59Nm 220V 3.9A
Spindle 2200W 24000rpm 0.87Nm 220V 5.8A
[380V square spindles]
Spindle 1500W 18000rpm 0.80Nm 380V 2.3A
Spindle 2200W 18000rpm 1.16Nm 380V 3.3A
Spindle 3500W 18000rpm 1.80Nm 380V 5.3A
Spindle 4500W 18000rpm 2.39Nm 380V 6.8A
I'm thinking why I cannot just use a Square 3.5kW 380V, 5.3A/phase spindle on a single phase input 2.2kW, 6A/phase, 220V VFD and take advantage of double the torque 1.80 Nm vs 0.87 Nm. I only need 6000 RPM so the drive voltage wont stop me here.
Has anyone else followed this path ?
Adam