The commutator on the DC generator converts the AC into pulsating DC. … 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 Class 10?
The function of commutator or slip ring is
to change the direction of current through the coil after every half rotation
.
What is a commutator & why it is used?
A commutator is
a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit
. … By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
What is commutation in a motor?
In order to generate motion in a three-phase linear motor there must be switching between the phases to energize appropriate windings.
The process of switching between the phases
is called commutation. In order to create the desired movement a controller must determine which phase needs to be switched on.
What are the functions of a commutator in DC machine?
The function of a commutator in a dc generator is
to collect the current generated in armature conductors
. While in the case of a dc motor, the commutator helps in providing current to the armature conductors. A commutator consists of a set of copper segments which are insulated from each other.
What is difference between armature and commutator?
| Armature Commutator | It receives current from the armature windings It receives current from the armature core | The core consists of armature windings, commutator, and brushes It has some segments |
|---|
Can commutator convert AC to DC?
Commutator
converts the Alternating to direct current in
a DC generator. The alternating current generated in the armature windings of the generator gets converted to direct current after it passes through the commutator and the brushes.
What are the function of brushes?
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.
What is armature class 10th?
Armature: It is
a rectangular iron core wrapped by the copper coil through which electricity passes and due to magnetic field it experiences a force and rotates
. Brushes: It conducts current between stationary wires and moving parts, most commonly in a rotating shaft.
What do you mean by commutator pitch?
Commutator pitch is defined as
the distance between two commutator segments in which two ends of the same armature coil are connected
. We measure commutator pitch in terms of commutator bars or segments.
What are the types of commutator?
These characteristics have been used to design a number of polyphase commutator machines, but currently only two types are in general use and are made in relatively large numbers :
stator-fed and rotor-fed motors with shunt characteristics
.
What is commutation process?
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 poor commutation?
A machine is said to be in poor commutation
if there is sparking at the brushes and commutator surface
. Poor commutation can be caused by mechanical or electrical condition. Mechanical conditions include : 1) Uneven commutator surface. 2) Non uniform brush pressure.
What is difference between commutator and slip rings?
The main difference is that
commutator is used for the conversion of AC to DC
. … Slip rings are used in AC motors to provide a continuous transfer of power whereas the commutators are used in DC motors to reverse the polarity of the current in the armature windings.
How is a commutator made?
The commutator itself is a split ring,
typically made of copper
, with each segment of the ring attached to each end of the armature coil. If the armature has multiple coils, the commutator will similarly have multiple segments—one for each end of each coil.
