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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.
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∙ 11y ago
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What is the useful of open end winding of induction motor?
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.
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.
What is induction motor?
Induction motor is an AC electric motor which uses electromagnetic induction to induce the electric current in the rotor to produce torque.
Does the value of the exciting current of your 3-phase motor depend on the rotor speed?
An induction motor has no excitation, so the question is about a synchronous motor. The rotor speed is determined by the supply frequency. For a given supply frequency and mechanical load, the excitation current can be adjusted to give the best power factor.
How do you convert from slip ring motor to induction motor?
short the rotor terminals.
How does a high frequency induction motor work?
In a high frequency induction motor, EMF is induced leading to current flow. Torque in the rotor coil increases. As frequency increases, Impedance of the Rotor increases and currency reduces.
What is the useful of open end winding of induction motor?
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.
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.
What is induction motor?
Induction motor is an AC electric motor which uses electromagnetic induction to induce the electric current in the rotor to produce torque.
Does the value of the exciting current of your 3-phase motor depend on the rotor speed?
An induction motor has no excitation, so the question is about a synchronous motor. The rotor speed is determined by the supply frequency. For a given supply frequency and mechanical load, the excitation current can be adjusted to give the best power factor.
Explain starting of a wound rotor induction motor?
explain wound rotor
Why induction motor runs slightly slower than supply frequency?
if the motor is at synchronous frequency there is no current induced in the shorted windings in the rotor so at no load its slightly less. if you drive the motor faster than synchronous speed it becomes a generator
How do you convert from slip ring motor to induction motor?
short the rotor terminals.
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.
How is single phase induction motor is constructed?
An induction motor is an alternating current (only) motor that has one or more coils of wire wound on a metal frame that induces a current in the conductors in the rotor when the rotor is moving at a different than synchronous speed. Synchronous speed it determined by the line frequency and the number of poles the motor has. For example, a two pole motor with a 60 Hz line frequency would have a synchronous speed of 3600 RPM. When used with single phase, the magnetic field generated in the stator needs to be caused to rotate around the rotor. In most cases this is initiated by a separate starting winding that is fed out of phase with the running winding(s). Once the rotor is rotating, the stator's field rotation has been established and the starting circuit is generally switched off.
What did mean by standstill in induction motor?
rotor speed = 0
Does induction motor has rotor winding?
Yes, the induction motor has a rotor winding. It is usually one turn, shorted. This is how the magnetic fields generated in the stator induce a current in the rotor, which subsequently generates a torque from the opposing magnetic fields, stator to rotor.
