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In electric motor: Alternating-current commutator motors. A specially designed series-commutator motor may be operated from a single-phase alternating voltage supply. When the supply current reverses, both the magnetic field and the armature current are reversed. Thus, the torque remains in the same direction.The output of any machine is AC or alternating current whether it is direct current (DC) or AC generator. Thus, in DC generator a device is necessary to change the current from alternating to direct. This necessity can be fulfilled by using a commutator.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 is the work of commutator?
The output of any machine is AC or alternating current whether it is direct current (DC) or AC generator. Thus, in DC generator a device is necessary to change the current from alternating to direct. This necessity can be fulfilled by using a commutator.
Is a commutator AC or 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.
EE 306 Electrical Machine II AC Commutator Motor by Chandra Shekhar sen
Images related to the topicEE 306 Electrical Machine II AC Commutator Motor by Chandra Shekhar sen
Why does an AC motor not need a commutator?
The main purpose of commutator is only to convert Ac to DC or vice versa, But in case of alternaters Commutator is not required because output will be AC only not DC. In case of DC generators Generation is AC so by using commutator will convert the AC to DC.
What is a DC 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.
Is commutator a rectifier?
A rectifier are used in power supplies but commutators are used in d.c. generators and motors. A commutator is a rotating device whereas a rectifier is not. The rectified output from a commutator is fed to an external circuit whereas the rectifier is used in the output circuit.
Do AC generators have commutators?
AC generator does not have commutators. DC generators have commutators to make the current flow in one direction only. AC generators have slip-rings.
What is the other name of commutator?
commutator; reverser; current-reverser; switch.
See some more details on the topic What is AC commutator motor? here:
AC Commutator Motors | AC Motors | Electronics Textbook
The series motor operates well above the synchronous speed of a conventional AC motor. AC commutator motors may be either single-phase or poly-phase. The single …
2-3-1. Structure and Characteristics of AC Commutator Motors
AC commutator motors have the following features: … Because of these characteristics, they are used for home appliances such as electric vacuum cleaners and …
The alternating-current commutator motor – IEEE Xplore
Abstract: The alternating-current commutator motor in its various forms has been developed principally for the purpose of obtaining adjustable or variable …
Commutator – an overview | ScienceDirect Topics
All generators produce a sine wave, or AC currents when the rotor turns in the magnetic field. The commutator on the DC generator converts the AC into pulsating …
Commutators: Basics on AC and DC Generation
Images related to the topicCommutators: Basics on AC and DC Generation
What will happen if there is no commutator?
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.
How does a commutator reverse the current?
The split ring commutator reverse the current in the armature every half revolution when the commutator changes contact from one brush to another. This reverse in current causes the forces acting on the coil to be reversed. This helps the coil continue to rotate in a clockwise direction.
Is slip ring a commutator?
A commutator is a specialized slip ring typically used on Direct Current motors and electrical generators to transfer electrical power between the stationary housing and the rotating armature with the added purpose of reversing the electrical current direction.
What is AC motor and how it works?
An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field.
What is the difference between armature and commutator?
…
Key Difference between Armature & Commutator.
Armature | Commutator |
---|---|
It provides current to commutator from the core of the armature | It changes AC to DC & vice-versa |
It is a set of coils arranged in the core | It is a set of segments |
Where is commutator used?
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.
How do Universal Motors work ?
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What are AC generators?
An AC generator is a machine that converts mechanical energy into electrical energy, generated as an alternating current sinusoidal output waveform.
What is back EMF in motor?
Back EMF is the system in the coil of an electric motor that opposes the current flowing through the coil, when the armature rotates. When the speed varies, the winding characteristics may fluctuate, resulting in variation of back EMF.
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