Electrical Engineering ⇒ Topic : Motor Torque in Terms of Tm

Sachin
 
Condition for Maximum Torque The value of torque when motor is running is given by \ Torque will be maximum when,
(where s_{MT} = slip corresponding to maximum torque Maximum torque From the above expression, the following conclusions can be drawn : Maximum torque is independebbt of rotor circuit resistance. Maximum torque varies inversely as standstill reactance of the rotor. Therefore, to have maximum torque, stand still reactance (i.e., inductance) should be kept as small as possible. The slip at which the maximum torque occurs depends upon the resistance of the rotor. The condition for getting torque will be maximum if  
 
Samual
 
MOTOR TORQUE IN TERMS OF T_{m} It is possible to express the torque T of an induction motor in terms of its maximum torque T_{m}.Stator resistance r_{1} or the stator equivalent resistance R_{e} is neglected to get a simple and approximate expression. Dividing Eq. (1) by Eq. (2), ............ (1) .............. (2) .................. (3) ............. (4) Substituting, R_{e} = 0 in Eq. (4), we get r_{2} = S_{mT} X .............. (5) Using Eq. (5), Eq. (4) can be written as: ................ (6)  
 
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