An armature is a device through which electric current is passed for generating torque (rotor). The current that passes through the rotor is sometimes called the armature current. The word “armature” refers to a device through which electric current is passed for generating torque.
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What is an armature in physics?
An armature is the will wound upon a soft iron core which is suspended such that it can rotate freely. 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.
What is the simple definition of armature?
Definition of armature 1 : an organ or structure (such as teeth or thorns) for offense or defense. 2a : a piece of soft iron or steel that connects the poles of a magnet or of adjacent magnets.
What is an armature and what is it used for?
The armature is an integral part of the motor (or generator), as this is the component that carries the alternating current (AC) in an electric machine. The armature conducts AC, even on Direct Current (DC) machines using the commutator (which reverses current direction every so often) or due to electronic commutation.
What is an armature in a DC motor?
A DC motor has coils of wire mounted in slots on a cylinder of ferromagnetic material, which is termed the armature. The armature is mounted on bearings and is free to rotate. It is mounted in the magnetic field produced by permanent magnets or current passing through coils of wire, which are called the field coils.
What is an armature in an electromagnet?
armature in American English c. the iron or steel applied across the poles of a permanent magnet to close it, or across the poles of an electromagnet to transmit a mechanical force.
Is an armature a coil?
The active conductors in the rotating element of DC motors and generators are often referred to as armature coils. These coils are installed in open or semi-closed core slots on the cylindrical surface of the laminated core. Armature coils are made from round or shaped magnet wire with one or more turns.
What is difference between armature and rotor?
It is located inside the stator and its objective is to rotate so that in turn the motor shaft or generator rotates. So basically, the rotor consists of a field magnet which rotates while the rotor remains stationary and on the other hand the armature carries current and is stationary and part of the stator.
How is an armature made?
Armature Core The core of the armature is made up of laminated thin metal plates instead of a single piece. The thickness of laminations depends on the supply frequency. It is approximately 0.5mm thick. The laminated silicon steel is used for the armature core to reduce the eddy current and hysteresis loss.
What is armature class 10th?
A long rectangular coil with multiple copper wires wound around an iron core is an armature. This armature winding is placed in a magnetic field and electricity is passed through it.
What are the 4 parts of an armature?
Armatures are comprised of four major parts: steel shaft, steel laminated core, copper windings, and copper-segment commutator. Armatures are designed as a component of a specific DC machine for operation in a compatible frame.
What is armature voltage?
Armature voltage is the voltage developed at the terminals of the armature winding of an AC or a DC machine during generation of power. Formula to calculate DC motor armature voltage: Amature voltage in volts = V = k ฮท ฮฆ Where k is the constant based on armature design. ฮท is armature speed in rpm.
Why is a armatures important?
In sculpture, an armature is a framework around which the sculpture is built, when the sculpture could not stand on its own. This framework provides structure and stability, especially when a plastic material such as wax, newspaper or clay is being used as the medium.
What is the advantage of armature?
1) The current is drawn directly from fixed terminals on the stator without the use of brush contacts. 2) The insulation of stationary armature winding is easier. 3) The number of sliding contacts (slip rings) is reduced. Moreover, the sliding contacts are used for low-voltage DC Source.
What is armature reaction?
Armature reaction is the effect on the main field flux of that flux set up by the currents in the armature winding. The effect is the same for both lap- and wave-wound machines.
What is meant by armature winding?
Armature winding can be defined as, an electrical machine in which emf can be generated because of the air gap field flux. It must be noted that the air gap is produced because of the DC current flow in the winding. In general, this winding is housed on slots of the stator & the field winding on rotor slots.
Why does armature experience a force?
The motor’s magnet exerts a force (up on one side, down on the other) on the armature, which causes the armature to rotate. Thus the armature experiences a torque due to interaction of its magnetic moment and motor’s magnet.
What is the armature core?
Armature core is the rotor of a dc machine. It is cylindrical in shape with slots to carry armature winding. The armature is built up of thin laminated circular steel disks for reducing eddy current losses.
Why armature is stationary in alternator?
The armature windings of the rotating field alternator, being stationary, are not subjected to vibration and centrifugal forces. A stationary armature can be easily insulated for the high voltage for which the alternator is designed.
What is the function of armature winding 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 are the two main components of the armature?
- 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 work of an armature and coil?
The armature coil cuts the magnetic flux lines and an induced emf is produced in the armature coil. Was this answer helpful?
Why is the armature made of iron?
The armature is also made of soft iron which can induce magnetism rapidly. No matter what direction is the current flow, the bell rings continuously as long as the push switch is closed because any pole induces the armature.
Is armature called rotor?
In DC machines, both motors and generators, the armature is the rotor, and the field is the stator. Because the armature is always the rotor on DC machines, many electricians and engineers mistakenly believe that the armature is the rotor on all motors and generators.
Is commutator a armature?
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. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine.