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What are the speed torque characteristics of induction motor?
The torque-speed characteristics of a three-phase induction motor is a straight line between the no-load and full-load operating points. The slope of the curve line depends upon the resistance of the rotor circuit i.e. the higher the rotor circuit resistance, the sharper the slope of the curve.
What is the stable operating region of torque speed characteristics of an induction motor?
Normally an Induction Motor is designed to operate at low full load slip ranging from 0.02 to 0.05 under normal operating condition. Figure above shows the slip-torque characteristics of an Induction Motor. Normal operating region is shown from s=0 to s=smT by solid line.
What are the torque-slip characteristics of induction motor?
The induction motor torque varies from zero to full load torque as the slip varies. The slip varies from zero to one. It is zero at no load and one at standstill. From the curve it is seen that the torque is directly proportional to the slip.
What is the starting torque of motor?
Starting torque is the maximum torque that can be produced by a motor in order to start rotational movement of the load. Stall torque is the maximum torque that can be applied to the shaft and cause the motor to stop rotating. When there is no rotation in the motor, the wound coils are acting as a fixed resistance.
What are the slip characteristics of an induction motor?
Rotor speed or actual speed is the speed at which rotor rotates. The range of slip is between zero to one and the range of rotor speed is between zero (standstill) and (synchronous speed). Torque slip characteristic is a curve plotted between the torque and the slip of induction motor. It also gives the relationship between torque and slip.
What is the torque speed of an induction motor?
FIGURE 6 Induction motor torque-speed characteristic. The slip is negative in the region to the right of the motor region, which implies the rotor is rotating faster than the stator field.
What are the torque slip characteristics of a motor?
The torque-slip characteristic curve can be divided roughly into three regions: Low slip region Medium slip region High slip region Motoring Mode In this mode of operation, supply is given to the stator sides and the motor always rotates below the synchronous speed.
How does voltage affect the torque of a motor?
From equation 7, we can immediately notice that the torque for a given value of slip is proportionate to the applied voltage squared. Thus, reducing the voltage applied to a motor will cause it to develop substantially less torque, or to operate at a higher value of slip for a given load.