CHAPTER 5
Permanent Magnet Applications S.H. Mahmood Physics Department, The University of Jordan, Amman, Jordan
[email protected] Abstract Permanent magnets are used in a wide range of applications, providing convenience, cost effectiveness, device miniaturization, as well as extending the operational capacities beyond those of conventional devices. In this chapter, some of the permanent magnet applications where hard ferrites are practically in use are addressed. In particular, the main energy conversion devices such as actuators and transducers, as well as some of the important microwave devices utilizing ferrite magnets are discussed.
Keywords Motor; Transducer; Microwave Absorption, Passive Microwave Devices
Contents 1.
Introduction ...........................................................................................154
2.
Classifications of Permanent Magnet Applications ...........................154
3.
Selected Permanent Magnet Applications ..........................................155
3.1
Loudspeakers ........................................................................................156
3.2
Permanent Magnet Motors ..................................................................157
3.3
Microwave Applications .......................................................................158
3.3.1 Microwave Absorbers ..........................................................................159 3.3.2 Isolators ..................................................................................................160 3.3.3 Circulators .............................................................................................160 3.3.4 Filters .....................................................................................................162
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References ........................................................................................................163
154
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