In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine or motor is used as a motor, this EMF opposes the armature current, and the armature converts electrical power to mechanical power in the form of torque, and transfers it via the shaft.
What is the use of armature in a motor?
An armature is used as an electric motor or generator. The armature is used to communicate between two magnetic fluxes. When the armature is used as an electric motor, due to relative motion between flux produced by the field winding and the flux produced by the armature winding the EMF is induced.
What does the armature do in an electric motor rotate?
When a current passes through the armature coil, forces act on the coil and result in rotation. Brushes and a commutator are used to reverse the current through the coil every half rotation and so keep the coil rotating.
Why is armature important?
This framework provides structure and stability, especially when a plastic material such as wax, newspaper or clay is being used as the medium. When sculpting the human figure, the armature is analogous to the major skeleton and has essentially the same purpose: to hold the body erect.
What is the purpose of armature core in DC machine?
Armature Core of DC Generator
The purpose of armature core is to hold the armature winding and provide low reluctance path for the flux through the armature from N pole to S pole.
What is the armature in a DC motor connected to?
The armature, which is the rotating part, is a simple coil. The armature is connected to a DC power source through a pair of commutator rings. When the current flows through the coil an electromagnetic force is induced on it according to the Lorentz law, so the coil will start to rotate.
How does a armature work?
In electrical engineering, an armature is the component of an electric motor which carries alternating Current.When the machine or motor is used as a motor, this EMF opposes the armature Current, and the armature converts electrical power to mechanical power in the form of Torque and transfers it via the shaft.
What are the effects of armature reaction?
Armature reaction has two undesirable effects: First, it distorts the main field. Secondly, it reduces the main field flux or both. When the main field is distorted, then there will be a cross magnetizing effect.
What is an armature in an electric motor Class 10?
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 is difference between armature and field winding?
Armature Winding is the winding, in which voltage is induced. Field Winding is the winding in which the main field flux is produced when the current through the winding is passed.
What causes armature failure?
Worn commutators are one of the most common causes of armature failure. When commutators become worn or damaged, they wear down carbon brushes much quicker which can result in a damaged or destroyed armature.
Can an armature be repaired?
Just like a stator or rotor, New Core can replace the core for your armature. The core can be on the shaft or off the shaft. Large or small, New Core can supply new lamination’s for virtually any armature, including banding grooves and appropriately sized press plates.
What is the price of armature?
Questions & Answers on Armature
| Material Type | Min Price | Max Price |
|---|---|---|
| Copper | Rs 220/Piece | Rs 400/Piece |
What is the effect of armature reaction in dc generator?
The adverse effects of armature reaction:
Armature reaction weakens the main flux. In case of a dc generator, weakening of the main flux reduces the generated voltage. Armature reaction distorts the main flux, hence the position of M.N.A. gets shifted (M.N.A. is perpendicular to the flux lines of main field flux).
What is an armature core?
Armature Core. The central mass of iron on which the insulated wire, to be rotated in the field of an electric current generator or motor, is wound.
What is armature conductor?
4.15) the armature conductors are formed as a thin-walled cylinder consisting essentially of nothing more than varnished wires wound in skewed form together with the disc-type commutator (not shown).
What are the parts of armature?
An armature is made up of a number of main components; the core, the commutator, the winding and the shaft.
- About the core. The core of an armature is made up of lots of thin metal plates called laminations, which are usually about 0.5mm thick.
- About the commutator.
- About the windings.
- About the shaft.
What is the purpose of Interpoles?
Interpoles. Interpoles are designed in DC motors to overcome the effects of the armature reactance and the self-induction of the machine. Most shunt and compound DC motors over one-half horsepower have interpoles located 90 electrical degrees from the main poles.
Is armature reaction good or bad?
Due to the above two effects of armature mmf, there are many detrimental effects on the Electrical machine. Distortion of Main Field Flux gives rise to three detrimental effects: Rise in Iron Loss, Poor Commutation and Sparking in Carbon Brushes.
How can the armature reaction be overcome in a DC motor?
3) The effect of armature reaction can be neutralized by use of compensating winding.
- It is always placed in series with armature winding.
- The armature ampere conductors under pole shoe must be equal to compensating winding ampere conductors which will compensate armature m.m.f. perfectly.
What is the function of armature and commutator?
Key Difference between Armature & Commutator
| Armature | Commutator |
|---|---|
| An armature is an essential component in a DC machine. | A commutator is a rotating electrical switch |
| It gets the flow of current from the windings of an armature. | It gets the flow of current from the core of an armature. |
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