convert ampreage into ft lbs of torque?

Question

i need the mathematical formula to convert amperage into ft lbs of torque

Answer 1

There's no simple conversion, since the torque depends on:
type of motor;
radius of the windings;
number of turns in the windings;
number of windings on the rotor and stator;
at what speed you are making the measurement.
See the ref. for some theory.
If you know the motor model there may be a data sheet available from the manufacturer.

Answer 2

You can't just convert current into torque. The torque on a current loop is given by the equation:

torque = NIA x B

Where N is the number of loops, I is the current, A is the area of the coil, and B is the magnetic field.

Answer 3

Electric current and torque are both the different phenomena.How can you compare?

(The ampere (symbol: A) is the SI base unit of electric current.

In physics, torque can informally be thought of as "rotational force". The SI units for Torque are newton metres although centinewton meters (cN·m), foot-pounds force (ft·lbf), inch pounds (lbf·in) and inch ounces (ozf·in) are also frequently used expressions of torque. )

For more information pl. visit:
http://scienceworld.wolfram.com/physics/ElectricTorque.html