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 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 does a commutator do?
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 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.
How does a commutator change AC to DC?
How does the commutator convert AC to DC in a DC generator? In the most simple of explanations, by switching polarity at the same moment the AC signal reverses direction. The polarity of the magnetic field determines the direction in which the current travels in the coils mounted on the rotor.
What is electric motor and its principle?
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.
What is the working of motor?
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft.
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 difference between commutator and slip rings?
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 the causes of sparking of motors?
Vibration of the machine itself may cause brush sparking and eventually result in commutator damage. Such vibration may be caused by imbalance in the armature, by poor foundations or other mechanical faults. It can also result from defective bearings.
What is commutation and its types?
The process used for turning off a thyristor is called as commutation. … The commutation techniques of thyristors are classified into two types: Natural Commutation. Forced Commutation.
What is the function of brushes in 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. Typical applications include electric motors, alternators and electric generators.
How does a commutator change current?
In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
How do you create a DC current?
DC can be generated in a number of ways: An AC generator equipped with a device called a “commutator” can produce direct current. Use of a device called a “rectifier” that converts AC to DC. Batteries provide DC, which is generated from a chemical reaction inside of the battery.