Compare with the traditional magnetostriction material and the piezoelectricity ceramics, the rare earth ultra magnetostriction material strain is big, responds quickly, band width, performance stable and so on a series of merits, thus has the widespread application prospect. Is more and more high along with the people to music quality request, uses the ultra magnetostriction material to manufacture the speaker, may give dual attention to the high bass - true high fidelity speaker, satisfies the people to music enjoyment. The high fidelity speaker key prepares the magnetostriction vibration part, again through the reasonable design speaker outer covering, and actuates through the match appropriate power amplifier, then obtains the performance outstanding magnetostriction type speaker.
This topic uses the most recent development one kind of low cost the magnetostriction polytropism alloy preparation technology - must from to consume the electric arc smelting law to prepare the high performance the ultra magnetostriction alloy stick. And by the ultra magnetostriction alloy stick took the magnetostriction speaker the core part, the design and R&D magnetostriction speaker, puts the electric circuit and the speaker mechanical part including the merit and so on, and carries on the debugging to it.
The experiment obtains the following conclusion: (1) uses must from consumes the electric arc smelting technology to prepare the high performance the rare earth ultra magnetostriction alloy good material, after 1100℃ the high temperature annealing, the obtained alloy good material in the magnetic field strength is 400kA/When m, its magnetostriction coefficient reaches 803.6×10-6; (2) use prepares the alloy stick took the electricity - sound transition element (magnetostriction oscillator), designs and makes a magnetostriction type speaker, obtained certain result after the debugging, but still waited for enters improves greatly; (3) develops uses in the magnetostriction speaker the high efficiency merit putting actuates the electric circuit, output approximately 12W, also its low distortion, width frequency response.
Keyword: giant magnetostrictive materials; loudspeaker;TDA2030 power amplifier