Induction Motor Torque Formula

Full load induction motor torque formula is as follows:
induction motor torque formula
 
The starting torque of a motor is that torque which is produce by it at start. It is denoted by Tst and corresponds to s = 1. So by substituting s = 1 in above expression, we get the expression for starting torque. Therefore starting torque formula for induction motor is as follows:
 
torque formula for induction motor image
 
The maximum torque is denoted by Tm and occurs at s = R2/X2. The value of slip which corresponds to maximum torque is denoted by sm. So by substituting s = R2/X2 in full load torque expression, we get the maximum torque expression. Therefore maximum torque formula for induction motor is as follows:
 
torque formula for induction motor image
 

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