I'm looking at the motor in my Hardinge TM to determine the requirements
for a VFD or phase converter.
The motor is a Diehl 220 V., 3 phase, two speed motor. The spec plate
lists the current draw as:
1720 RPM 3/4 HP 2.3A
875 RPM 3/8 HP 3.2A
What is causing the to motor to suck up an (almost) additional Amp at
the slower speed? I can understand that multi speeds would require some
design compromises, but that seems like a lot of inefficiency.
17 years ago