Actually I calculated 84 amps for the full 10hp -- 746 X 10 / 90% for motor eff. Not sure of starting currents for single phase - but probably very high as it would probably be DOL.
One horsepower (HP) equals 746 watts. If a motor is rated at a true 1HP, that means it delivers 746 watts of mechanical power. Since single-phase motors (the kind usually found in consumer power tools) are never 100% efficient in converting electrical energy to mechanical energy, the amount of electrical power consumed by the motor is considerably higher than the mechanical power delivered. In fact, losses from heat, friction, etc., mean that a typical single-phase motor is, at best, around 60-70% efficient. A figure closer to 60% is more realistic for the small induction motors typically found in many home-shop power tools. That means a genuine 1HP motor requires roughly 1250W or more of electrical power to deliver its rated power. In short, you will need at least 10 amps of current at 125V, or 5-plus amps at 250V to realistically deliver a true one horsepower from your motor. This is a good rule of thumb to keep in mind.
Ross
We saw that. increasing the supply V, lowers the amps to more practical levels, which is why most of those size motors will use 3 phase at around 480V, if I'm not mistaken.
"If stupidity got us into this mess, then why can't it get us out?" - Will Rogers (1879-1935) ***************
mrelet : as i experienced...i didnt find in the market the vfd 10hp single phase..you better to find 230v, 3 phase, and your motor will be also 3 phase...and the amps rated is 28A.....
hp x 746
______________________ = 27.6A
1.73 x 230v x .8 x .85
