Torque-slip characteristic for a three phase induction motor
Relation between torque and slip
torque / slip curve is shown in figure:
torque / slip curve is shown in figure:
 |
| fig. Torque-slip characteristic |
For range s=0 to s=1 with R2 as parameter
Now,
1) When s=0 ,
T=0 at point 0.
2) At normal speed close to synchronous speed the term sX2 is small.
Therefore:
or T directly proportional to s. if R2 is constant
So curve is approximately straight line.
3) As slip increases, the torque is also increase and become maximum when,
Hence torque-slip curve is a rectangular Hyperbola.
Therefore :
Beyond maximum torque , further increase in motor
load results in decrease of torque. This results that.
motor slow down and eventually stops.
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