Loudspeaker - PowerPoint PPT Presentation

1 / 4
About This Presentation
Title:

Loudspeaker

Description:

The commutator (split ring) reverses current when the coil passes through the vertical plane. ... reduces friction between commutator and external circuit. ... – PowerPoint PPT presentation

Number of Views:49
Avg rating:3.0/5.0
Slides: 5
Provided by: twghslokon
Category:

less

Transcript and Presenter's Notes

Title: Loudspeaker


1
Loudspeaker current carrying coils in a radial
magnetic field. Coils are attached to large paper
cone. Signal (varying electric current and
voltage) flow in coils. Large current gives rise
to large amplitude of movement of paper cone, and
hence a large volume of sound. Frequency of
signal give sound of the same pitch.
2
Motor The commutator (split ring) reverses
current when the coil passes through the vertical
plane. This ensures a constant sense of torque
acting on the coil, and hence a constant sense of
rotation of the coil. The carbon brushes reduces
friction between commutator and external
circuit.
3
Practical Motors large number of turns gives rise
to great torque. Several turns in different
planes ensures smooth rotational speed. Curved
magnets provides radial magnetic field and gives
smooth rotational speed. Soft iron core gives
strong magnetic field. Laminated iron core
reduces eddy current and reduces energy lost.
4
Moving-coil meter When current flows in coil, the
coil is deflected. When the coil is steady, the
torque produced by current is equal to the torque
produced by the hair springs. The sensitivity
(deflection per unit current) can be increased
by 1. Using large number of turns on the coil. 2.
Increasing the strength of the the magnetic
field. 3. Using a weaker hairsprings. 4.
increasing the area of the coil.
Write a Comment
User Comments (0)
About PowerShow.com