There isn't. They rotate at the same angular speed at any loading condition, hence they always appear stationary to each other.Noaha said:What will happen if there is relative speed between them?
I think that would require a pretty big post to explain. I believe you can find the explanation in any standard electrical engineering book. If you are still unclear, you can post some specific queries.Noaha said:How these two fluxes interact with each other to develop a torque?
cnh1995 said:There isn't. They rotate at the same angular speed at any loading condition, hence they always appear stationary to each other.
Slip is the *mechanical* speed difference between rotor & stator. As loading changes, slip also x hanged, but both magnetic fluxes revolve at synchronous speed for any load value.Dr.D said:Doesn't this indicate that there is no slip? If slip is zero, there is no torque developed in an induction machine. I think this is mistaken.
cabraham said:x hanged
cabraham said:Slip is the *mechanical* speed difference between rotor & stator.
?Dr.D said:but that is not correct the slip.
This is right. But what I want to know is how it will effect the machine if their angular speeds are not same? Like what will the effect on torque developed or efficiency.cnh1995 said:They rotate at the same angular speed at any loading condition
It never happens unless there is some fault in the motor, like when one or two of the stator phases get open circuited, or when there are broken rotor bars etc. That results in an uneven torque and rotor vibrations. There may be some other abnormal conditions that can cause unbalanced magnetic pull. But that is a whole different topic and is taken care of while designing the motor.Noaha said:But what I want to know is how it will effect the machine if their angular speeds are not same?
That was informative. Thank you.cnh1995 said:It never happens unless there is some fault in the motor, like when one or two of the stator phases get open circuited, or when there are broken rotor bars etc. That results in an uneven torque and rotor vibrations. There may be some other abnormal conditions that can cause unbalanced magnetic pull. But that is a whole different topic and is taken care of while designing the motor.
Under normal working conditions, the physics of the motor does not let it happen.
Noaha said:But what I want to know is how it will effect the machine if their angular speeds are not same?
Typo, sorry, should read "changed". Anyway, the revolving fields both have an angular speed equal to synchronous speed. For 4 poles at 60 Hz, that is 1800 rpm. Call this 100%. The rotor mechanical speed is a little less, around 98%, for example, which is 1764 rpm. The slip is 2%.Dr.D said:?
Even though this is basic, this is something new for me. With this I understood why the stator and rotor flux should have same speed. Thank you.jim hardy said:product of two sinewaves of different frequencies averages to zero
Are you talking about single phase induction motor here?jim hardy said:You see this on a washing machine motor when trying to start it with the wrong start winding energized.
It just hums(really loud) and gets hot.
That's because the start and run windings with their different #s of poles make their respective rotating fields at different frequencies , not same frequency with just differing phase that's necessary to produce a rotating field
Yes.Noaha said:Are you talking about single phase induction motor here?
The rotor and stator flux in a 3 phase induction motor is responsible for creating a rotating magnetic field that allows the motor to convert electrical energy into mechanical energy, which is used to power various industrial and household appliances.
The stator flux is produced by the stator windings and remains stationary, while the rotor flux is produced by the rotor bars and rotates at a slightly slower speed than the stator flux. These two fluxes interact to create a rotating magnetic field that causes the rotor to turn and the motor to run.
The strength of the rotor and stator flux in a 3 phase induction motor is affected by the amount of current flowing through the stator windings, the number of turns in the windings, and the frequency of the power supply. Changes in these factors can alter the strength and speed of the rotating magnetic field.
The direction of the rotor and stator flux is crucial for the proper functioning of a 3 phase induction motor. The direction of the flux must be opposite to each other for the motor to rotate. If the directions are the same, the motor will not start, and if they are not opposite, the motor will run in the opposite direction.
Yes, the rotor and stator flux can be controlled by varying the voltage and frequency of the power supply, as well as by changing the number of turns in the stator windings. This allows for precise control of the motor's speed and torque, making it suitable for a wide range of applications.