Page 694 - Basic Electrical Engineering

0.2, 0.3, 0.4, etc., is smaller than , and hence we can write

or,

Thus, we see that for lower values of slip, torque is directly proportional to
slip, and for higher values of slip, torque is inversely proportional to slip. We
further calculate the values of torque at S = 0 and S = 1. Also, we calculate

the value of maximum torque and the slip at which maximum torque occurs.
These values will help us draw the torque–slip characteristic.

At S = 0, T = 0

With

The value of slip at which T occurs is
m

and the value of starting torque at S = 1 is

We will now draw the torque–slip characteristic using the above values.