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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.
How to find stator to rotor turn ratio of a slip ring induction motor?
In open circuit, find the ratio of voltages across the slip rings in rotor side to the applied stator voltage.
What are the two different forces acts in opposite direction on the rotor of single phase induction motor?
An induction motor has an AC power source applied to the stator and an AC source applied to the rotor, through slip rings. The rotor spins a sub synchronous speed, which creates the phase shift between rotor AC and stator AC. This phase shift (known as slip) is what creates the torque.
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.
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
Difference between squirrel cage and wound rotor induction motor?
Both have 3 a phase stator winding, the squirrel cage has a rotor with bars arranged around it's periphery, these bars are joined at both ends by a continuous ring. This forms a closed circuit of low resistance which is fixed. The wound rotor (slip ring motor) is similar in construction but the bars are replaced by copper windings, similar to those in the stator. They are star connected and the three ends are brought out to slip rings which allow an electrical connection to be made to the outside world. When no connection is made between these ends and the stator is energised, little current flows in the stator which does not turn, but when some resistance is inserted, current flows in the stator windings and the rotor rotates. As the rotor gains speed the resistance is taken out of circuit and the slip rings shorted together. The motor runs as a cage induction motor.
What is the slip of a synchronous motor?
Synchronous motors have no slip. This is because the rotor runs at the same speed as the speed of the rotating magnetic flux of the stator.
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.
Just at start the slip of a 3-phase induction motor is?
Just at start slip is 100% because the rotor is not moving yet but the stator field is in full rotation.
How the slip vary with load?
The slip vary with load is a AC electric motor which the electric current in the rotor needed to make torque that is induced by electromagnetic induction. It does not repair mechanical commutation parts the energy and transferred from stator to rotor.
What is the torque speed characteristic?
the ratio of the relative speed of stator magnetic field with the speed of rotor, to the speed of rotor is defined as slip. where as in torque slip characteristic is the graph between the speed of the rotor and the torque experienced on the rotor. in the case of induction motor, the torque decreases with the increase in the rotors speed. while in the case of sychronous motor, its different (you check out, because i just forgot about it!! keep smiling!
What is mean by slip in an induction motor?
Slip (S): It is defined as the difference between the synchronous Speed [Ns] of the rotating stator field and the actual rotor speed [N] .Mathematically,%Slip (s) = [(Ns - N)/N] *100whereNs - N : Slip Speed.To note:When( i) Rotor is stationary ( i . e .) s=1At this condition Voltage induced in rotor conductors is maximum.(ii) rotor rotates @ Synchronous Speed ( i e ) Ns = NAt this condition Voltage induced in rotor conductors is zero.In an induction motor0.1% < s < 3% an essential need for a constant speed motor.Rotor resistance is independent of slip [S].
