Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
Torque-Slip Characteristics in Three Phase Induction Motors
Three Phase Induction Motors: Torque-Slip Characteristics
TORQUE‒SLIP
CHARACTERISTICS
The motor torque under
running condition is given by,
If the characteristic
curve is drawn between the torque and slip for a particular value of rotor
resistance R2, then it will be known as torque‒ slip characteristics.
Fig. 5:19 shows torque‒slip characteristics of 3ϕ induction motor for a slip range
from s=0 to s=1 for various values of rotor resistance.
The following points
may be noted
1. At s=0, torque T=0.
So that the curve starts from origin.
2. At normal speed,
slip 's' is small so that sX2 is negligible as compared to R2.
T ∝ s/R2
T ∝ s
Hence, T‒s curve is a
straight line from zero to a slip value corresponding to full load.
3. As slip 's'
increases beyond the full load slip, the torque increases and becomes maximum at
s = R2/X2. This maximum torque in an induction motor is
called pull‒out torque or break‒down torque. Its value is atleast twice the
full‒load value when the motor is operated at rated voltage and frequency.
4. When slip increases
beyond the value corresponding to maximum torque, the term (sX2)2
increases rapidly so that R22 may be neglected as
compared to (sX2)2.
Τ ∝
s
/ (sX2)2
T ∝ 1/s
As X2 is
constant. Thus, the torque is inversely proportional to the fractional slip.
Hence T‒s curve becomes rectangular hyperbola.
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors : Tag: Basic Engineering : - Torque-Slip Characteristics in Three Phase Induction Motors
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
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