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Why does voltage increase with current with separate excitation?
More current in the field coils means a stronger magnetic field for the armature to rotate in. This causes the output voltage for a generator to increase. For a motor, more magnetic field means that the supply voltage can be matched at a slower armature rotation speed, so the motor runs more slowly but can supply more torque.
Why don't the transformers rotate as InductionMotors when they are given AC supply?
The transformer components don't rotate (or move at all) simply because they are rigidly mounted. If you suspend a thin wire in the air close to an iron object, and pass a current through the wire, it will move, being attracted toward the iron by the magnetic field produced by the current. Motors are specially arranged with the magnetic field in just the right spot so that it acts on the armature to cause rotation. Of course the armature rides on bearings so it can rotate. Transformers have no components that are free to move, and the magnetic field is directed so as to induce a voltage in the secondary winding. That's what transformers do. Nothing inside the transformer is free to rotate. Interestingly, if you ever get a chance to stand near a large transformer, you will hear a buzz or humming sound. This is the wires and iron core actually moving a very tiny amount as the magnetic field acts on them. There is no rotation though, just a small vibration back and forth as the magnetic field builds and collapses.
What will happen if AC motor is fed by mistake to a DC motor?
It depends on whether the field winding of the dc motor is connected in series or in shunt with the armature winding.If it is connected in series,the motor will rotate since the torque,which varies as the product of the armature and field current is always positive.Thus,a positive average torque causes the motor to rotate,however the pulsating nature may cause the commutator segments and brushes to wear out. Thus only small sized dc motors may be used with ac supply.
What is the function of a split ring commutator?
The split rings cause the direction of the magnetic field in the armature to change direction as the motor rotates. If this didn't happen the motor would not rotate. Slip rings can be used for an AC motor which causes the direction of the magnetic field to change with the AC waveform.
What part of motor makes the current in the coil reverse every half turn so that motor spins continuously?
The direction of the current flowing through it must be changed after every half rotation. Otherwise, when the north pole of the coil comes near the south pole of the magnet, there will be attraction between them and the coil will stop rotating.
What makes the armature in the electric motor rotate?
from Faraday's law of electromagnetic induction : when a current carrying conductor cuts the magnetic field an E.M.F (electro motive force) is produced and it sets up in such a direction so as to oppose the cause of it. the stator winding of a motor which produces the R.M.F (rotating magnetic field) serves as the magnetic field and the armature winding is the current carrying conductor which cuts the magnetic field , thus an EMF is induced in the armature which again produces a force to oppose the emf produced in the armature winding.
The operation of an electric motor depends on?
The operation of an electric motor depends on the interaction of magnetic fields, passing of electric current through coils of wire (armature), and the resulting electromagnetic forces that cause the motor to rotate. The direction of the current and the arrangement of the magnetic fields determine the direction of the rotation, while the flow of current and the strength of the magnetic fields dictate the speed and torque of the motor.
Does armature rotates?
Typically the armature windings are in the stator of a generator, which does not rotate. Typically the field windings are on the rotor, which rotates.
Why does voltage increase with current with separate excitation?
More current in the field coils means a stronger magnetic field for the armature to rotate in. This causes the output voltage for a generator to increase. For a motor, more magnetic field means that the supply voltage can be matched at a slower armature rotation speed, so the motor runs more slowly but can supply more torque.
What is the function of slip rings in ac generator?
They rotate the armature coil.
If you were to mechanically rotate the armature in an electric motor what would happen?
You said "armature" so it is a dc motor. Hence if the field is permanent magnet type then a voltage appears at the armature terminals nd its magnitude depends on the speed nd magnetic field strength. If it's field coils, then they must be seperately excited (if it don't possess residual). By changing the field strength you can vary the voltage produced at armature terminals.
What component is made of loops of wire that rotate in the magnetic field provided by the field poles and field coils?
An armature is the component that is made of loops of wire that rotate in the magnetic field provided by the field poles and field coils. This rotation induces an electromotive force and generates electrical energy in devices such as generators and alternators.
What does a field magnet do in a motor?
A field magnet in a motor generates a constant magnetic field that interacts with the magnetic field produced by the armature, causing it to rotate. This rotation creates mechanical energy that drives the motor. The field magnet helps establish the direction of the magnetic field within the motor, ensuring proper operation.
What is the purpose of field coil in a electric motor?
The field coil in an electric motor creates a magnetic field when electricity flows through it. This magnetic field interacts with the armature, causing it to rotate and generate mechanical motion. The field coil determines the strength and direction of the magnetic field, influencing the motor's efficiency and performance.
Is it possible to orient a current loop in a uniform magnetic field such that the loop will not tend to rotate?
Yes, it is possible to orient a current loop so that it does not tend to rotate in a uniform magnetic field. This can be achieved by aligning the plane of the current loop perpendicular to the direction of the magnetic field. In this configuration, there will be no net torque acting on the loop, thus preventing it from rotating.
What is the difference between tangential and radial forces in physics?
In physics, tangential forces act parallel to the surface of an object, causing it to rotate. Radial forces, on the other hand, act perpendicular to the surface, causing the object to move in a circular path.
Why it is an advantage for armature to rotate in radial magnetic field rather than uniform?
1.maximum torque is experienced 2.torque is uniform for all positions of coil
