Question

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1.47 It is desired to achieve a time-v the magnetic circuit of Fig. 1.41 of the form where Bo = 0.6 T and Bi = 0.20 T. The dc field Bo is to be created by a neodymium-iron-boron magnet with magnetization characteristic of Fig. 1.19, whereas the time-varying field is to be created by a time-varying current. For Ag 7 cm2, g 0.35 cm, and N 175 turns, and based upon the neodymium-iron-boron characteristics of Fig. 1.19, find: a. the magnet length d and the magnet area Am that will achieve the desired de air-gap flux density and minimize the magnet volume and the amplitude of the time-varying current required to achieve the desired time-variation of the air-gap flux density. b. Area Am Magnet Air gap: area Ag N turns i(t) Figure 1.41 Magnetic circuit for Prob 1.47. 1.6 Application of Permanent-Magnet Materia neodymium-iron-boron Alnico5 samarium-cobalt 1.5 1.4 1.3 1.2 H-- Alnico 8 Ceramic 7 1.0 0.9 10.8 10.7 в, 10.6 0.5 0.4 0.3 0.2 ー10.1 -1000-900 800 70000 500 400 300200 100 0 Figure 1.19 Magnetization curves for common permanent-magnet materials. materials involved. In fact, in practical engineering devices, the situation is often mo H, kA/m complex. 10 This section will expand upon these issues. Figure 1-19 shows the magnetization characteristics for a few common permanen

Answer 1

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