What is the condition for maximum torque in induction motor?
Hence, the developed torque is maximum when the rotor resistance per phase is equal to the rotor reactance per phase under running conditions. By putting the value of sX20 = R2 in equation (1) we get the equation for maximum torque.
Which one of the below is the condition for maximum torque under running condition of an induction motor?
Maximum running torque occurs when S = R/X or R = S.X So the condition for maximum running torque is rotor resistance should be equal to slip times the rotor reactance at standstill. 08․
What is the condition for maximum reluctance torque obtained?
Maximum excitation power occurs at 90° and maximum power due to reluctance occurs at 45°. Therefore, the maximum power developed in salient pole synchronous machine occurs at load angle less than 90°.
How do you calculate maximum torque?
Torque on the loop can be found using τ=NIABsinθ τ = N I A B sin . Maximum torque occurs when θ = 90º and sin θ = 1.
What is reluctance or saliency torque?
Reluctance torque or alignment torque is experienced by a ferromagnetic object placed in an external magnetic field, which causes the object to line up with the external magnetic field. Reluctance torque is mainly developed in the reluctance motor. It is produced in the motor due to the varying reluctance.
How to find the condition for maximum torque?
The condition for maximum torque may be obtained by differentiating the above expression with respect to slip s and then putting it equal to zero. However, it is simpler to put Y = 1/T and then differentiate it.
What is the maximum torque condition of an induction motor?
The following conclusion about the maximum torque can be drawn from equation (7) are given below. It is independent of the rotor circuit resistance. Torque at the maximum condition varies inversely as the standstill reactance of the rotor.
Is there a max torque condition for a VFD?
The maximum torque for that type of motor occurs at zero speed. Such a motor is not normally used with a VFD. If it were to be used, the VFD would likely limit the torque to 150% of rated torque.
How can I get maximum torque at a standstill?
By varying the resistance in the rotor circuit, maximum torque can be obtained at any desired slip or the speed. It depends upon the rotor resistance at the slip (s M = R 2 /X 20 ). To develop maximum torque at the standstill condition, the rotor resistance must be high and should be equal to X 20.