It is responsible for the production of flux It is responsible for the receiving of armature current It transmits AC alternating current to segments The AC is changed into DC with the segments. It generates flux that communicates through the major field to generate armature reaction Because of the armature reaction, it is capable of receiving the current using the winding of the core.
How does an Armature Rotate in a Motor? Generally, an electric motor converts the energy from electrical to mechanical. In DC machines, it is a rotary part. When the supply is given to the stator, the rotating magnetic field is induced in the motor. This rotating magnetic field exerts a force on the armature rotor and the armature rotates.
This is sometimes referred to as the armature reaction of a synchronous motor. Thus, this is all about an overview of the difference between armature and commutator. The major disparity between the armature or rotor windings is how the connection of windings can be done electrically. Here is a question for you, what are the rotor and stator in dc machines? Difference between Armature 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. Once the coil completes half a turn just ignore we have a commutator , then the forces on the coil will be opposite.
So the coil has a tendency to rotate in the opposite direction. So the commutator reverses the current in every half turn producing a steady torque and the armature coil rotates in a single direction. They can either be graphite or precious metal brushes which have electrical motor connections. The brushes are connected to the commutator bars which allows the current to flow into the winding. An armature is a combination of the winding, commutator, brushes, and ball bearings…. What is Commutator?
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. The reversal of the direction of current in coil every half a turn ensures direction of induced forces on the right side and left side of coil will remain unchanged, keeping the coil in clockwise moment rotating in same clockwise direction.
In AC induction motor, two windings in stator create a rotating magnetic field, which makes the rotor rotate. So there is no need of supply to rotor and hence no commutator. However, in series motor, available for both AC and DC supply, commutators are used to supply current to rotor windings. Every electric circuit, regardless of where it is or how large or small it is, has four basic parts: an energy source AC or DC , a conductor wire , an electrical load device , and at least one controller switch.
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. Otherwise, the coil would rotate degrees one way, and then switch direction. For an excellent visual showing how the current is switched due to the position of the coils and brushes, see this article from the University of Utah.
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.
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