rexsmith
Plastic
- Joined
- Jan 2, 2006
- Location
- San Jose, Ca
I just received a prototrak lathe, and am trying to figure out what kind of VFD or converter to use with it.
The confusing part to me is that although it has a 7 1/2 HP spindle motor, the nameplate on the lathe calls for 3 phase input of 25 amps. The spec also calls for a source of 9.5KVA That's enough for 12.5 HP, far more than 7.5 HP. Checking other motor manufacturers, I'm finding that a 7.5 HP 3 phase motor typically calls for around 10KVA. ??? The efficiency for that comes out to around 0.6 Doesn't make sense to me.
I'm finding that digital phase converters for this power level are extremely expensive. Beginning to investigate VFDs, but not sure I'm going to find a single to three phase VFD at that power level.
This is my first time around this block, so any helpful comments would be appreciated.
thanks, rex
The confusing part to me is that although it has a 7 1/2 HP spindle motor, the nameplate on the lathe calls for 3 phase input of 25 amps. The spec also calls for a source of 9.5KVA That's enough for 12.5 HP, far more than 7.5 HP. Checking other motor manufacturers, I'm finding that a 7.5 HP 3 phase motor typically calls for around 10KVA. ??? The efficiency for that comes out to around 0.6 Doesn't make sense to me.
I'm finding that digital phase converters for this power level are extremely expensive. Beginning to investigate VFDs, but not sure I'm going to find a single to three phase VFD at that power level.
This is my first time around this block, so any helpful comments would be appreciated.
thanks, rex