What are the applications of induction motor?
AC induction motors are the most common electric motors in the world. These simple, reliable and economical motors are found in refrigerators, washing machines and furnaces, as well as conveyors, pumps, winders, wind tunnels and other industrial equipment.
What is difference between squirrel cage and induction motor?
Key Differences Between Slip Ring & Squirrel Cage Induction Motor. The motor whose rotor is wound type such type of motor is called slip ring induction motor, whereas the squirrel cage motor, has a squirrel cage type rotor. … The starting torque of the slip-ring motor is high, whereas in squirrel cage motor it is low.
What is a single speed squirrel cage induction motor?
A squirrel-cage rotor is the rotating part of the common squirrel-cage induction motor. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface. … The interaction of the magnetic fields of currents in the stator and rotor produce a torque on the rotor.
How does a squirrel cage rotor work?
The field windings in the stator of an induction motor set up a rotating magnetic field through the rotor. In effect the rotor is carried around with the magnetic field but at a slightly slower rate of rotation. … The difference in speed is called slip and increases with load.
Which motor is used in fan?
What are the applications of 3 phase induction motor?
Applications of Three Phase Induction Motor
- Large capacity exhaust fans.
- Driving lathe machines.
- Oil extracting mills.
- Textile and etc.
What is the meaning of squirrel cage?
Definition of ‘squirrel cage’
1. a cage consisting of a cylindrical framework that is made to rotate by a small animal running inside the framework. 2. a repetitive purposeless task, way of life, etc.
Why do we use slip rings in motors?
Functionally, slip rings provide a continuous transfer of power, signals, or data. Specifically, in AC motors, they transfer resistance to the rotor windings. Commutators, on the other hand, are used in DC motors to reverse the polarity of current in the armature windings.
How does an induction motor start?
When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor starts rotating and the induction motor starts. … At the time of starting, the motor slip is unity, and the starting current is very large.
What are the advantages and disadvantages 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)
Why starter is used in induction motor?
The three phase induction motors are self-starting due to rotating magnetic field. But the motors show tendency to draw very high current at the time of starting. … Hence there should be a device which can limit such high starting current. Such a device which limits high starting current is called a starter.11 мая 2017 г.
What is synchronous speed?
Synchronous speed is a significant parameter for the rotating magnetic field-type AC motor. It is determined by the frequency and the number of magnetic poles. Synchronous speed No = [rps, revolutions per second] f = Frequency [Hz]
How do you test a squirrel cage rotor?
To check for porosity or a crack in an end ring, check the resistance from bar to bar on each end ring with a low-resistance ohmmeter. The bar and end ring resistance tests can also be performed with the rotor hot, by heating in a bake oven, to detect faults that may be related to ther- mal expansion.
Why squirrel cage rotor is short circuited?
Shorting of rotor bars in form of squirrel cage cause the suitable low impedance path for rotor induced currents. … When the rotor is stationary, the revolving magnetic field cuts the short-circuited secondary conductors at synchronous speed and induces in them line-frequency currents.