Custom Neodymium Ring Magnet for Motor and Speaker

Neodymium ring magnets for loudspeaker

Neodymium is an element with specific characteristics that make it particularly well suited for use in speaker construction.
Speakers operate by using a magnetic field to generate motion in a coil and speaker cone to project an amplified sound signal
In neodymium speakers, the rare-earth element is used as the primary material in the magnets that create the field needed to drive the speaker movement.
In order to translate an electrical signal into an audible sound, speakers contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it. This coil behaves much like a normal (permanent) magnet, with one particularly handy property: reversing the direction of the current in the coil flips the poles of the magnet.

Neodymium is a ductile and malleable silvery-white metal. Neodymium is strongly paramagnetic. The major application of neodymium is in high-strength permanent magnets based on Nd2Fe14B that are used in high-performance electric motors and generators, as well as in spindle magnets for computer hard drives and wind turbines. Neodymium magnets are available in a wide range of shapes, sizes and grades.Ring magnets are like discs or cylinders, but with a center hole.

Both Ferrite Ring Magnet and Neodymium Ring Magnet are defined by three dimensions: Outer Diameter (OD), Inner Diameter (ID), and Height (H).
The magnetic direction types of ring magnets are axially magnetized, diametrically magnetized, radially magnetized, and multi-axially magnetized.

Sintered neodymium magnets are widely used in such applications as holding, motors, consumer electronics, medical, sensors and speakers.  Due to the high magnetic strength of a Neodymium Magnet, it has replaced other magnetic materials in order to make a design smaller but achieve the same result.  Neodymium ring magnets are used extensively in industries such as the jewelry, medical, automotive, aerospace and power generation applications.