On Tue, 26 Jun 2007 09:51:18 -0700, wrote:

On Jun 24, 5:20 am, Ron Rosenfeld wrote:
...
Ron, what peak starting current should I expect on a single-phase,
240V, 3/4h.p., running current=7.8A motor used to lift my hangar door?
I want to rig up a genny to lift the door during a power failure. The
gear train on the door is rigged so that all of the cables are slack
(i.e. only motor inertial) when the motor starts.

I'm not Ron, but IN GENERAL, it will be 4 to 8 times running current
.... with no load, the peak won't last long at all, just until the
motor gets to perhaps to 90% of speed.

I looked on the Baldor website, and that is high current for a 3/4 HP
motor from them. A 3600 rpm is 4.75A, an 1800 is 5.3A.