Gentlemen:

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.

Kevin Gallimore


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