INDUCTION MOTOR TORQUE-SPEED CHARACTERISTICS Figure 6.12a illustrates a squirrel-cage rotor of an induction motor that is operating at no load (near synchronous speed). The magnetization current IM flowing in the motor's equivalent circuit (Fig. 6.7) creates the net magnetic field Bnet. Current IM and hence Bnet are propor- tional to E1.

FIGURE 7 Induction motor torque-speed characteristic. The maximum torque that the motor can produce is called the breakdown torque. The motor cannot operate in the steady-state at

The principal advantages of the squirrel-cage induction motor are its simplicity of design and robust construction. Its torque/speed and current/speed characteristics are such that, on

One big advantage of a squirrel cage motor is how easily you can change its speed-torque characteristics. This can be done by simply adjusting the shape of the bars in the rotor.

for the intended application. The speed-torque curve will allow the user to determine if the motor has enough starting torque to overcome friction, to accelerate the load to full running speed, and if it can handle the maximum overload expected. See Figure 9 for a typical speed-torque curve. Figure 9. Typical Motor Speed-Torque Curve

08/01/  · In squirrel cage induction motor starting torque is very low. The speed of the rotor will depend on the AC power, and the speed can be controlled by changing the input supply

Squirrel-cage induction motors are very prevalent in industry, in sizes from below 1 kilowatt (1.3 hp) up to tens of megawatts (tens-of-thousand horsepower). The shape and depth of the rotor bars can be used to vary the speed-torque characteristics of the induction motor. At standstill, the revolving magnetic field passes the rotor bars at

Due to these advantages induction machines have become more popular in industrial applications. For any motor load application, it is imperative to know the torque speed

Torque Speed Characteristic is the curve plotted between the torque and the speed of the induction motor. · At the maximum torque, the speed of the rotor is 

Typical Torque-Speed Curve of a Cage Induction Motor · The Locked Rotor Torque or Starting Torque is the torque the electrical motor develops when it starts at 

We can make rotor of induction motor as wound rotor or a squirrel cage rotor. In majority of the cases industrial scale applications involve the use of three-phase squirrel-cage induction motors

The torque-speed characteristics of motor (T M) and load (T L) for two cases are shown in the figure (a) and (b). The load torque is equal to motor torque at points P, Q, R and S The speed of a three phase cage­rotor induction motor depends on. Q6. A 3-phase, 440V, 50 Hz supply is applied to a 3-phase, 4-pole, 440V, star-connected

At starting of the motor, frequency of induced emf is high because of large slip (slip = frequency of rotor emf / supply frequency). Hence the reactance of 

The torque-slip characteristics show how the torque changes with a change in slip. The slip is defined as a ratio of synchronous speed and the actual speed of 

The squirrel cage motor receives its name from the type of rotor utilized in the motor. A squirrel cage rotor is made by linking bars to two end rings. If the metal lamination’s were eliminated

SECTION 7.6 VARIATIONS IN INDUCTION MOTOR TORQUE–SPEED CHARACTERISTICS. 395. FIGURE 7–25. Laminations from typical squirrel-cage induction motor rotors,