Is it possible for an induction motor with a squirrel cage rotor to run at synchronous speed?

The rotor is placed in such a way that this magnetic field induces a current in the rotor. Due to this difference in flux, the rotor will experience a torque and will start to rotate at speed less than synchronous speed due to lagging. So, theoretically, the Induction motor can never run at synchronous speed.

Can a squirrel cage induction motor generate electricity?

Induction generators Three phase squirrel cage induction motors can also be used as generators. For this to work the motor must see a reactive load, and either be connected to a grid supply or an arrangement of capacitors to provide excitation current.

Why are squirrel cage induction motors not used for loads requiring high starting torque?

Main disadvantage of squirrel cage induction motor is that they have poor starting torque and high starting currents. Starting torque will be in the order of 1.5 to 2 times the full load torque and starting current is as high as 5 to 9 times the full load current.

What will happen when the excitation to the field of a synchronous motor is disconnected while the motor is rotating?

The machine will continue to run at synchronous speed due to reluctance torque (i.e. even when field winding or armature windings are disconnected). The rotor will remain in synchronism for a short time ie.. Variable reluctance motor behaves as similar to silent pole synchronous motor unexcited.

What is the advantage of the wound rotor motor over the squirrel cage motor?

Another important advantage over squirrel-cage motors is higher starting torque. The speed and torque characteristics of a wound-rotor motor can be adjusted by changing the external resistance, unlike a squirrel cage motor which has a fixed characteristic. This is useful for speed control of the motor.

Can induction motor runs at synchronous speed?

The Induction Motor cannot run at Synchronous speed because the Slip is never zero in an Induction Motor.

How does a squirrel cage induction motor work?

Squirrel cage motors are a subclass of induction motors, which harness electromagnetism to generate motion. The AC current passed through the stator creates an EMF that fluctuates with the AC frequency, which “rotates” around the rotor, inducing opposing magnetic fields in the rotor bars, thus causing motion.

What is difference between squirrel cage and induction motor?

The slip ring induction motors have high starting torque with low starting current whereas squirrel cage motors have low starting torque and high starting current. The operation of slip ring induction motor is more sensitive to the fluctuations in supply voltage as compared to the squirrel cage motor.

What is the advantage of squirrel cage induction motor?

Advantages of Squirrel Cage Induction Motor They are low cost. Require less maintenance (as there are no slip rings or brushes) Good speed regulation (they are able to maintain a constant speed) High efficiency in converting electrical energy to mechanical energy (while running, not during startup)

What are the disadvantages of squirrel cage induction motor?

Disadvantages of squirrel cage induction motor :

• Poor starting torque.
• High starting current.
• Speed control is not possible in a squirrel cage induction motor., in short, no speed regulation.
• Sensitive to change in supply voltage.
• More sensitive to the supply voltage regulation fluctuations.

What happened to synchronous motor if only field is excited?

As the Field Winding is excited by AC source, an alternating / pulsating magnetic flux will be produced. The armature conductor at Stator will not see any change in flux due to backward rotating field flux and hence no EMF will be generated in the Armature Terminal of Alternator.

What would happen if we supply the DC field at the starting of a synchronous motor?

When AC supply is given to the stator winding or static armature winding of the synchronous motor it creates a rotating magnetic field. If we give DC supply to the field winding or rotor winding of the synchronous motor then the pole created in the rotor will be constant.