From Magnet Solution (China) Co., Ltd.
Permanent magnets are used in the following major groups: acoustic transducers, motors and generators, magneto mechanical devices, and magnetic field and imaging systems. You will find permanent magnets in many products, such as televisions, telephones, computers, audio systems and automobiles.
The permanent magnet family consists, in general terms, of non-rare earth permanent magnets and rare earth magnets. The non-rare earth magnets include Alnico (Aluminum-Nickel-Cobalt) magnets and Ceramic (Strontium and Barium Ferrite) magnets. Rare earth magnets include Sm-Co (Samarium-Cobalt) magnets and Nd-Fe-B (Neodymium-Iron-Boron) magnets.
Although non-rare earth magnets are used in the majority of these applications due to their economic cost, rare earth permanent magnets have many distinguishing characteristics, such as a large Maximum Energy Product, (one performance index for permanent magnets). Dozens of magnetic materials which contain rare earth have been developed recently. Two major families of rare earth permanent magnets, Sm-Co magnets and Nd-Fe-B magnets, have been widely used in a variety of applications. Each family has its own advantages and disadvantages.
How to Choose Permanent Magnet Materials
Each permanent magnet material discussed above has its own pros and cons. How to choose the right one for your particular application is a challenge to any user. A balance between cost and performance must be considered in selecting of permanent magnet material. In Reference Information section of this page, several reference books are listed. These books may be helpful to you in designing and selecting permanent magnet materials. Following is a Comparison Table to help you select a right permanent magnet material for your applications.
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We will review in this paper the recent data on thermal stability and radiationresistance of rare earth permanent magnets. Scanning electron microscopy analysis suggests that the affected surface...
Superior magnetic properties of Sm-Co based magnets, especially their excellent high temperaturestability and low temperature coefficient, have led to an exciting variety of applications. Despite the...
Permanent Magnet Assemblies Modern permanent magnets are ideally suited to generate magnetic fields of magnitudes comparable to their spontaneous polarization, J s. These fields can be static or...
TORQUE PRODUCTION Torque is produced by the interaction between the axial current carrying conductors on the rotor and the radial magnetic flux produced by the stator. The flux or excitation can be...
Experts say the single most important advance in PM motor technology was the introduction of rare-earth magnetic materials in the mid-1970s. Samarium-cobalt and, to a lesser extent, neodymium has...
