Motor Ratings

Common sense says it can't be the latter as 2 HP is an awful lot of power to simply turn the motor over at its rated speed. I'll await the definitive answer though!

Henry

Your 2hp motor will drive 2hp at the shaft under "full load". This isn't the absolute maximum power output, it's the maximum continuous (or specified) duty without overheating. The motor can output more power than this ok, but for shorter periods of time; just how much more will depend on motor type and design. You and the yank were right; you might like to ask the two electronic engineers exactly what use it is to know the no-load power :)

Mechanical output power is always given in hp or kW on a nameplate. The electrical input power required to achieve this will be defined by the rated voltage, full load current and power factor. The exception to this is domestic appliances, like hoovers, where the manufacturer will rate the motor by its electrical power to make it appear bigger... which is why a 750w power drill doesn't (fortunately) put out 1hp.

hth Guy

Hi,

Thanks Guy,

Michael

Hi,

I guess I should have said continous.....

Michael