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Same and opposite rubber magnetic and ferrite materials development
Towards high frequencies: With the increasing operating frequency of switching power supplies, corresponding magnetic materials have been developed one generation after another. Take TDK Japan as an example. At the beginning of the 1970s, the H35 was developed for civil switching power supplies operating at about 20 kHz. In the early 1980s, the H7C1 with a working frequency of about 100 kHz and a negative temperature coefficient was developed. In the late 1980s, the third-generation power ferrite material PC40 with an operating frequency of about 250 kHz was developed. Into the mid-1990s, due to information technology requirements for device miniaturization and slice.
Rubber magnet, also known as bonded permanent magnet ferrite, is made of bonded ferrite magnetic powder, rubber or plastic and other magnetic materials, after extrusion, calendering or injection molding. Due to the high plasticity of the material itself, the finished product or semi-finished product can be cut, punched, slit, and twisted on other materials at will, and it is not easy to demagnetize, and has good corrosion resistance. It is mainly divided into same-sex rubber and opposite-sex rubber. Big class. The main differences between the two are as follows: 1 magnetic difference: same-sex rubber magnetism is weak, and the opposite sex rubber magnet has a higher magnetic function. 2 work for different temperatures and densities, the same sex rubber magnetic than the opposite sex rubber magnetic density and temperature is low. 3 different areas of application: same-sex rubber magnet is mainly used in refrigerator magnets, printed products, and promotional materials. The opposite sex rubber magnetic, it is a large number of applications in micro motors, computers, laser printers, copiers, magnetic toys and other fields.
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