key term - Armature

Definition

The armature is a crucial component in electric motors, generators, and transformers, responsible for converting electrical energy into mechanical energy or vice versa. It is the part of the device that rotates or moves, generating the necessary magnetic fields to produce the desired output.

5 Must Know Facts For Your Next Test

1. The armature in an electric motor is the part that rotates, generating the necessary magnetic fields to produce mechanical energy.
2. In a generator, the armature is the part that rotates and generates the electrical current through electromagnetic induction.
3. The armature in a transformer is the part that moves the magnetic field, allowing for the transformation of voltage and current levels.
4. The design and construction of the armature, including the windings and core material, significantly impact the efficiency and performance of the electric device.
5. The commutator is an essential component of the armature, responsible for reversing the direction of current flow to maintain continuous rotation.

Review Questions

• Explain the role of the armature in the operation of an electric motor.
  • In an electric motor, the armature is the rotating part that generates the necessary magnetic fields to produce mechanical energy. The armature windings carry the electric current, which interacts with the magnetic field created by the stator to produce a torque, causing the armature to rotate. The design and construction of the armature, including the windings and core material, are crucial in determining the motor's efficiency and performance.
• Describe the function of the armature in a generator.
  • In a generator, the armature is the rotating part that generates the electrical current through electromagnetic induction. As the armature rotates within the magnetic field created by the stator, it induces a voltage in the armature windings, which is the output of the generator. The design and construction of the armature, including the windings and core material, play a significant role in the generator's efficiency and the quality of the electrical output.
• Analyze the importance of the armature in the operation of a transformer.
  • In a transformer, the armature is the part that moves the magnetic field, allowing for the transformation of voltage and current levels. The armature, which is typically a coil of wire, is wrapped around a core material and is responsible for transferring the magnetic field between the primary and secondary windings. The design and construction of the armature, including the core material and the number of turns in the coil, are critical in determining the transformer's efficiency and the accuracy of the voltage and current transformation.

Related terms

Stator:

The stationary part of an electric motor or generator that creates the magnetic field, while the armature is the rotating part.

Commutator:

A device that reverses the direction of current flow in the armature of a motor or generator, allowing for continuous rotation.

Rotor:

The rotating part of an electric motor or generator, which includes the armature and is responsible for producing the magnetic field that interacts with the stator.