Squirrel cage motors are a subclass of induction motors, which harness electromagnetism to generate motion. They are so-called “squirrel cage” motors because the shape of their rotor – the inner component connected to the output shaft – looks like a cage.
Why mostly the squirrel cage type induction motor is used?
Squirrel cage induction motors are commonly used in many industrial applications. They are particularly suited for applications where the motor must maintain a constant speed, be self-starting, or there is a desire for low maintenance. These motors are commonly used in: Centrifugal pumps.
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.
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.
What are induction motors used for?
Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFD) in variable-speed service.
What is the purpose of squirrel cage?
A synchronous motor may have a squirrel-cage winding embedded in its rotor, used to increase the motor starting torque and so decrease the time to accelerate to synchronous speed. The squirrel cage winding of a synchronous machine will generally be smaller than for an induction machine of similar rating.
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.
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.
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]
Which type of motor has high starting torque?
DC Series motor has high starting torque. We can not start the Induction motor and Synchronous motors on load, but can not start the DC series motor without load. DC motor has high starting torque.In a series motor the same current flows through the armature and the field winding.
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.
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.
What is the slip?
SLIP is the difference between the synchronous speed of the magnetic field and the shaft rotating speed and would be some number of RPM or frequency. The slip increases with an increasing load, thus providing a greater torque.
Which motor is used in fan?
What is the application of motor?
The applications of electrical motor include the following. The applications of electrical motor mainly include blowers, fans, machine tools, pumps, turbines, power tools, alternators, compressors, rolling mills, ships, movers, paper mills.
Is a fan AC or DC?
Most ceiling fans, as well as most household appliances, use AC motors, as AC is the type of current distributed by power companies. … With DC fans, the direct (AC) power source, connects to a transformer which converts the power to DC.