Torque in Imperial units can be calculated as
T inlb = P hp 63025 / n (1)
where
T inlb = torque (in lb f )
P hp = horsepower delivered by the electric motor (hp)
n = revolution per minute (rpm)
Alternatively
T ftlb = P hp 5252 / n (1b)
where
T ftlb = torque (lb f ft)
Torque in SI units can be calculated as
T Nm = P W 9.549 / n (2)
where
T Nm = torque (Nm)
P W = power (watts)
n = revolution per minute (rpm)
The torque delivered from an electrical motor producing 0.75 kW (750 W) at speed 2000 rpm can be calculated as
T = ( 750 W ) 9.549 / (2000 rpm)
= 3.6 (Nm)
The torque delivered from an electrical motor producing 100 hp at speed 1000 rpm can be calculated as
T = (100 hp) 63025 / (1000 rpm)
= 6303 < (lb f in)
To convert to pound-force foot - divide the torque by 12 .
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