The voltage generated in the armature is alternating in nature, and the commutator converts it to direct current. Simply put, the commutator turns the coils on and off to control which direction the electromagnetic fields are pointing.
What is the role of commutator in electric motor?
The commutator assures that the current from the generator always flows in one direction. … On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.
What is the function of a commutator in an electric motor Class 10?
Commutator rings of the coil helps to reverse the direction of current flowing through the coil after every half rotation of the coil.2 мая 2014 г.
What would happen if a commutator were not used in a motor?
Well, without commutator, the machine will not develop a unidirectional torque and motoring action will not take place. In a DC motor, at the instant when armature coil passes through magnetic neutral axis, current in armature coil must reverse to maintain torque in the same direction.
What is commutation in motor?
The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes.
Can commutator convert AC to DC?
In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit.
What is the role of brushes in an electric motor?
A brush or carbon brush is an electrical contact which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. … The lifespan of a carbon brush depends on how much the motor is used, and how much power is put through the motor.
What ways can a motor be made more powerful?
We can increase the turning force (or torque) that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can increase the electric current flowing through the wire, or we can make the coil so it has many “turns” (loops) of very thin wire instead of one “turn” of thick wire.
What is the principle of motor?
The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.
How does an electric motor work class 10?
Principle of Electric Motor
The principle of the electric motor is based on the fact that a current carrying conductor produces a magnetic field around it. A current carrying conductor placed perpendicular to magnetic field experiences a force.
Why will a motor not work without a commutator?
Without commutator it will not rotate and the armature oscillates between north and south poles. No motor action. Reason is…. Without commutator it will not rotate and the armature oscillates between north and south poles.
What will happen if there is no split ring commutator in electric motor?
Answer. Explanation: Without a split ring commutator the current would not reverse when armature reverses, and the magnetic fields of the rotor and stator would clash and the rotor will stick in a position and not turn.
What is the difference between slip ring and commutator?
Physically, a slip ring is a continuous ring, whereas a commutator is segmented. Functionally, slip rings provide a continuous transfer of power, signals, or data. … Commutators, on the other hand, are used in DC motors to reverse the polarity of current in the armature windings.
What is ideal commutation?
(also called straight-line commutation) is that in which the current of the commutating coils changes linearly from + to in the commutation period as shown in Fig. 7.15. The figure also shows delayed commutation and the current in the spark.