Torque

Torque = number of poles x number of winding x max flux x I/ ( 2 x 3.14 )

T=(no.of poles *no.of conductors*max. flux*1.59*armature current)/no.of windings

no the calculations for the dc and ac motor torques are not same

regards

priyanka

So which one is AC and which is DC. Please keep it simple for us poor mechanically minded individuals.

Thank you for the answer. I am one formula now. Please tell us is it okay.

i.e Torque in Kg-m=(Motor HP x 727)/Base Speed.

Contacting the original manufacturer of the motor with a serial number may yield a motor performance chart that will indicate torque, speed, current, efficiency, etc., etc.

Assuming you want rated torque, torque in N.m = rated power (watt)/rated speed (radians/sec). Same for AC and DC.

Codey

For US units of HP, RPM, FtLbs:

Torque = HP x 5250 / rated speed

Same for AC or DC, it is in the definition of torque / power / work / speed which are all physics. Motor name plate only reflects mechanical power produced.

Now, if you want to calculate accelerating torque, methods of starting, efficiency, inrush current etc. that is a study in itself.