- #1
Rx7man
- 425
- 189
- TL;DR Summary
- wiring question about 3 phase motors
I have a small 1hp 3 phase that really lacks torque, it was on a big lathe (12hp) and the entire rest of the machine was wired for 240V delta.. but this motor only has 3 wires coming into the connector box, so there are no options for changing the voltage, yet the nameplate says 220V Delta or or 440V Wye, if I'm reading it correctly?
I checked the phase to phase resistance, it's 21 +/- 1/2 Ohm, I tried running it on a VFD, still has no torque, RPM is correct for the frequency, draws 4.5A when stalled
How much torque does it have? well, you can easily grab the 2.5" pulley on it with your hand and stop it.. That's certainly not 1 hp.
Only thing I can think of is that it's meant to be 440V powered, but then how did it ever work?
I checked the phase to phase resistance, it's 21 +/- 1/2 Ohm, I tried running it on a VFD, still has no torque, RPM is correct for the frequency, draws 4.5A when stalled
How much torque does it have? well, you can easily grab the 2.5" pulley on it with your hand and stop it.. That's certainly not 1 hp.
Only thing I can think of is that it's meant to be 440V powered, but then how did it ever work?