What would happen if a commutator was not used in a motor?
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.
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 are the disadvantages of a commutator?
The disadvantages of commutators are high consumption of electrical-grade copper, sparking, and wear caused by brush friction.
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 the speed of dc motor?
DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.
What does a brush do in a DC motor?
The function of the brushes is to conduct electricity to the individual segments as they rotate from brush to brush. This allows the motor to turn in one direction at a speed determined by the number of windings in the armature.
What are two methods of DC motor control?
There are three main ways to achieve speed regulation in series DC motors–flux control, voltage control, and armature resistance control.
- Flux Control Method. …
- Voltage Regulation Method. …
- Armature Resistance Control Method.
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.
Do all AC motors have brushes?
AC induction motors have no brushes and have a much longer life expectancy. DC motor speed is controlled by varying the armature current, while AC motor speed control is achieved by varying the frequency of the alternating current, often with a variable frequency drive(VFD).
Can a commutator be repaired?
Mold-type commutators are not repairable and must be replaced if damaged. When a commutator comes in for a repair, units are disassembled and rebuilt with new copper and mica segments using the same quality assurance processes applied to new commutators.
Who invented dynamo?
What is the difference between armature and commutator?
An armature is a combination of the winding, commutator, brushes, and ball bearings.
What is 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|