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Why rotor speed less than syncrones speed?
Rotor speed is less than synchronous speed in an induction motor because the motor operates on the principle of electromagnetic induction. The rotor must lag behind the magnetic field produced by the stator to create relative motion, which induces current in the rotor windings. This difference in speed, known as slip, is essential for torque generation. If the rotor speed were equal to synchronous speed, no relative motion would exist, and the motor would produce no torque.
What is the unit of measure for magnetic induction?
One of the most common electrical motor used in most applications which is known as induction motor. This motor is also called as asynchronous motor because it runs at a speed less than synchronous speed. In this, we need to define what is synchronous speed. Synchronous speed is the speed of rotation of the magnetic field in a rotary machine and it depends upon the frequency and number poles of the machine. An induction motor always runs at a speed less than synchronous speed because the rotating magnetic field which is produced in the stator will generate flux in the rotor which will make the rotor to rotate, but due to the lagging of flux current in the rotor with flux current in the stator, the rotor will never reach to its rotating magnetic field speed i.e. the synchronous speed.
What is mean by slip power?
Slip power is the electrical power that is converted into mechanical power due to the slip between the stator magnetic field and rotor in an induction motor. It is the power required to maintain the rotor's rotation at a speed slightly lower than the synchronous speed of the stator field.
What are the advantages of open end winding induction motor over conventional induction motor?
Open ended induction motor - i assume you are talking about split phase induction motor. With these motors old style speed controlling method using external resistors can be used. However this is now obsolete.
Why slip ring induction motor rotor failure occurs?
while running, a slip ring induction motor ,it got tripped and found 2 nos power fuses blown out.on inspection rotor winding IR value zero.ie after releasing the brushes. how it happens?. pl ans when the motor is starting its an induction motor with a squirrel cage while its getting up to speed the voltage across the slip rings will be very high there is a field resister shorting the rings this is removed and replaced with dc with a make before break field application relay if the dc is applied before the motor is up to near synchronous speed the stator will need to have very high current to accelerate the mass of the machine sometimes the controls are magnetic sometimes a centrifugal switch sometimes a timer a compressor will have an unloader to minimise load on the motor before the dc is applied however this is done if dc is on the field before you get close to operating speed you will blow fuses if the "failure" happened while running it could be a momentary power interruption or a momentary load interruption if the controls didnt see it and restart the motor you can dissect the fuses and see weather you had a short or an overload or add a bit more detail about the equipment and incident
What did mean by standstill in induction motor?
rotor speed = 0
What happens to the rotor speed and rotor current when the mechanical load on an induction motor increases?
rotor speed will decrease....the rotor current wil increase.....
What happen to the rotor speed and rotor current when the mechanical load on an induction motor increases?
rotor speed will decrease....the rotor current wil increase.....
What is meant by Slip of an induction motor?
Slip is referred to as the difference between the speed of the rotor and the speed of the rotating magnetic field in the stator of the induction motor. Speed of the rotor=n(1-s) Speed of the rotating magnetic field= f/p
Why induction motor current increase when load increase?
The slip is proportional to the load torque in an induction motor. This can also be seen as a reduction in speed causing extra current to be induced in the rotor to supply the increased torque.
Why induction motor speed is always less then synchronous speed?
induction motor never runs at synchronous speed, if it does so there would not be any relative speed between stator flux and rotor and no emf will induce in rotor and we can not apply motor principle as we need current carrying conductor in magnetic field.
Why an induction motor will never run at synhoronous speed?
An induction motor relies on low-frequency currents induced in the rotor by the difference in speed between the rotor and the rotating magnetic field. At sychronous speed the induced current is zero therefore the torque is also zero.
Why rotor speed less than syncrones speed?
Rotor speed is less than synchronous speed in an induction motor because the motor operates on the principle of electromagnetic induction. The rotor must lag behind the magnetic field produced by the stator to create relative motion, which induces current in the rotor windings. This difference in speed, known as slip, is essential for torque generation. If the rotor speed were equal to synchronous speed, no relative motion would exist, and the motor would produce no torque.
Difference between induction motor and induction generator?
in case of induction motor the rotor speed is less than synchronous speed giving positive slip but in case of generator the rptor speed is greater than synchronous speed giving negative slip.......
What will happen to speed-torque characteristics of an induction motor is the rotor resistance is increased?
If Rotor resistance is increased torque is increased
When induction motor is switched on the rotor frequency is?
The induction motor rotor has different frequency compared to it's stator. The rotor has slip ( s ) frequency. slip = ( Synchronous speed - rotor speed ) / Synchronous speed Synchronous speed = ( 120 * f ) / P where f = supply frequency to the stator. p = no of poles rotor speed is the actual speed the motor is running. Frequency in the rotor = slip * frequency in the stator At starting rotor speed is zero, so slip is one. Let us take the supply frequency is 50 Hz, then rotor frequency is also 50 Hz at starting. The motor attains speed and runs with its full speed at a point of time. Then let us take the slip is 0.04 then the rotor frequency will be 2 Hz.
Why does the rotor of an induction motor turn slower than the revolving field?
In an induction motor the rotor currents are induced by the magnetic field of the stator, and if the motor were to run at synchronous speed the induced currents and also the torque would fall to zero. The rotor currents alternate at a low frequency determined by the 'slip', which is the percentage amount that the rotor speed is below the synchronous speed. The output torque is proportional to the slip at near-synchronous speeds.
