What is the action of commutator in DC generator?
The commutator on the DC generator converts the AC into pulsating DC. The commutator assures that the current from the generator always flows in one direction. The brushes ride on the commutator and make good electrical connections between the generator and the load.
What is commutation action?
Commutation in DC machines is the process by which the reversal of current takes place. In DC generator this process is used to convert the induced AC in the conductors to a DC output. In DC motors commutation is used to reverse the directions of DC current before being applied to the coils of the motor.
What is the function of a commutator?
The function of commutator ring in an electric motor is to reverse the direction of current flowing through the coil every time coil just passes the vertical position during a revolution. Hence as the direction of the current is reversed, the torque is changed in the direction.
What is the function of commutator in DC generator Mcq?
Commutator is used to convert AC current into DC current.
What is the function of commutator Class 10?
Answer: The function of commutator or slip ring is to change the direction of current through the coil after every half rotation.
What will happen if no commutator is used in DC generator explain?
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 essential difference between commutation in a DC generator and commutation in a DC motor?
Difference between DC Motor and DC Generator
| Characteristics | DC Motor |
|---|---|
| Commutation | Motor uses commutators for changing the magnetic field polarity |
| Electromotive force (EMF) | Emf is utilized by coil and useful for rotating the axle |
| EMF Vs Terminal Voltage | EMF in armature is less than its terminal voltage (Eb |
How does a DC commutator work?
Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. 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.
What is the role of commutator in DC 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.
What is the action of the induced emf in a running DC motor?
When the armature of a DC motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence emf is induced in them as in a generator. The induced emf acts in opposite direction to the applied voltage V (Lenz’s law) and is known as Back EMF or Counter EMF (Eb).
Which function is performed by counter EMF of a dc motor?
Which function is performed by counter emf of a DC motor? Explanation: Back emf or counter emf makes the DC a self-regulating machine i.e. it makes the DC motor to draw as much armature current as it is just enough to develop the required load torque.
What is the use of commutator in DC motor Class 10?
How does the commutation in a DC generator work?
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. Again in DC Motor, the input DC is to be converted in alternating form in
How is the action of a commutator obtained?
Due to this, commutating action is very fast and almost straight line i.e. pure d.c. can be obtained across the load. In a practical d.c. generator, the small poles in addition to the main poles, fixed to the yoke in between the main poles are used to improve the commutation. These poles are called interpoles.
When did William Ritchie invent the commutator?
A commutator is a rotary electrical switch that periodically reverses the current between the rotor and the external circuit. The commutator was discovered by William Ritchie and Hippolyte Pixii in 1832. Commutators are used in DC machines (DC motors and DC generators) universal motors.
When does the commutator reverse the current flow?
The commutator reverses the current flow within a winding when the shaft turns. Once the shaft completes a half-turn, the windings are connected so that current supplies through it in the reverse of the first direction.