Permanent magnet for loudspeaker and processing technology thereof

Abstract

The invention discloses a permanent magnet for a loudspeaker and a processing technology thereof. The permanent magnet comprises the following components by weight percentage: 10-14.5 percent of neodymium, 1.5-2.4 percent of calcium carbonate, 2.2-2.6 percent of titanium, 8-12.5 percent of zinc oxide, 2-4.5 percent of boron, 3-4.5 percent of aluminum oxide, 0.2-0.8 percent of gallium and balance of iron oxide. The raw materials are treated through oxidization, air-stream milling, molding, isostatic pressing, oil peeling, sintering and post-processing to obtain products. By using the iron oxide as the foundation bed of the permanent magnet, when the molar ratio of ferric iron to ferrous iron in the iron oxide is 2:1, the maximum magnetic energy product of the permanent magnet is the highest, the magnetic induction coercivity is high, the connection of grains in the permanent magnet is stable after long-time use, the sound quality of the loudspeaker is guaranteed, the long-time use of the loudspeaker is facilitated, different alloy metals can be added according to loudspeakers at different frequencies, the application scope is wide and the overall performance of the loudspeaker is improved.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a permanent magnet used in the field of loudspeakers and a processing technology thereof. Background technique [0002] The working principle of the permanent magnet in the speaker: there is an electromagnet with a movable iron core between the two poles of the permanent magnet in the speaker. When there is no current in the coil of the electromagnet, the movable iron core is attracted by the two magnetic poles of the permanent magnet. Keep still; when current flows in the coil, the movable iron core is magnetized and becomes a bar magnet. As the direction of the current changes, the polarity of the bar magnet also changes accordingly, making the movable iron core rotate around the fulcrum, and the vibration of the movable iron core is transmitted from the cantilever to the diaphragm (paper cone) to push the air to vibrate thermally. [0003] Since the permanent magnet ...

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Problems solved by technology

[0003] Since the permanent magnet in the speaker needs to work under the sound of different frequencies, and in the case of sound waves of different vibration frequencies for a long time, it is easy to cause the internal grain structure of the permanent magnet to loosen, which in turn leads to the decline of the magnetism of the permanent magnet. The sound is easily distorted, which will lead to a decrease in the service life of the overall speaker, which will have a great impact on the subsequent maintenance and overall performance of the speaker

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