Permanent Magnet Materials: Key Insights

Permanent Magnet Materials Key Insights

Table of Contents Comparison of Permanent Magnet Materials: Properties, Performance, and Applications Permanent magnets are important because they furnish stable magnetic fields conveniently. In many instances, modern magnets furnish higher magnetic fields than electromagnets. For example, in some small motors they not only eliminate wire wound electromagnets, which require direct current to be energized, but […]

Co₅R Permanent Magnets: Powder-Based Technology

Co₅R Permanent Magnets Powder Based Technology

Table of Contents Co₅R Permanent Magnets Based on Powders: Properties and Applications The powder metallurgy technique is an excellent approach to the production of small and/or intricately shaped magnets. As a starting point, Co5R ingots are prepared by standard melting techniques and ground to powder by a number of methods. These methods include ball milling, […]

Cast Permanent Magnets: Co-Cu-Sm & Co-Cu-Ce Systems

Cast Permanent Magnets Co Cu Sm & Co Cu Ce Systems

Table of Contents Cast Permanent Magnets of the Co-Cu-Sm and Co-Cu-Ce Systems: Composition, Properties, and Modifications Substantial permanent – magnet properties have been obtained in materials based on the rare – earth binary compounds by using solid solutions of (text{Co}_{5}text{R}) and (text{Cu}_{5}text{R}) [1]. The coercive force of these materials can be controlled by the precipitation […]

Magnetic Power: Intermetallic Compounds in Permanent Magnets

Magnetic Power Intermetallic Compounds in Permanent Magnets..

Table of Contents Magnetic Properties of Intermetallic Compounds: Their Relevance to Permanent Magnetss In the search for new technological magnetic materials, the most interesting for use as permanent – magnet materials would be those exhibiting large values of saturation magnetization and magnetic anisotropy. As noted in the previous chapter, some of the hexagonal (text{Co}_{5}text{R}) intermetallic […]

The Importance of Rare Earth Elements in Modern Technology

The Importance of Rare Earth Elements in Modern Technology

Table of Contents Rare Earth Elements and Their Alloys with Cobalt, Copper, and Iron: Properties and Applications The term rare earth is usually applied to those elements having atomic numbers 58 (Ce) to 71 (Lu) (Table 2.1). Occasionally, the Group 3B elements Sc (21), Y (39), and La (57) are included in this group because […]

Elementary Aspects of Magnetism: Key Principles

elementary aspects of magnetism key principles..

Table of Contents Some Elementary Aspects of Magnetism: Understanding the Basics Permanent magnets are an important part of our modern technology, and their use is increasing. The new permanent magnets based on cobalt – rare earth alloys will certainly expand the usefulness of this class of materials. It is the purpose of this chapter to […]

Exploring Other Applications of Magnetic Technology

Exploring Other Applications of Magnetic Technology

Table of Contents 6.5 Other Applications of Magnetism: Emerging Technologies and Innovations Superconducting Permanent Magnets: Revolutionizing Magnetic Systems Superconducting magnets are usually understood to be electromagnets made from coils with numerous turns of superconducting wire. However, a solid block or ring of superconducting material may have some of the properties of a Figure 6.33. . […]

Active Recoil in Dynamic Magnetic Systems Explained

Active Recoil in Dynamic Magnetic Systems Explained

Table of Contents 6.4 Dynamic Applications with Active Recoil: Advancing Motion Control Magnetic Actuators: Precision Control in Modern Technology An actuator is any electromechanical drive with a limited linear or angular displacement. This definition encompasses loudspeakers, microphones, Figure 6.26. A flat voice-coil actuator for a personal computer disk drive Moving – coil loudspeakers have been […]

Dynamic Magnetic Applications: Mechanical Recoil Uses

Dynamic Magnetic ApplicationsMechanical Recoil Uses

Table of Contents 6.3 Dynamic Applications with Mechanical Recoil: Harnessing Magnetic Motion Permanent – magnet structures can be adapted to produce a variable field by some change of the air – gap or movement of the magnets with respect to one another. The working point is displaced as the magnets move, or turn, so these […]

Exploring Static Applications of Magnetic Fields

Static Applications of Magnetic Fields

Table of Contents 6.2 Static Applications of Magnetism: Principles and Uses Uniform Magnetic Fields: Generation, Properties, and Applications It is not obvious that permanent magnets can be used to generate uniform fields, because the magnetic field produced by a point dipole of moment (m A m^{2}) is quite inhomogeneous (figure 6.5(a)). It is given by […]