Method for manufacturing metal magnetic powder core can-type magnetic core and magnetic core with high direct current superposition characteristics

Abstract

The invention provides a metal magnetic powder core can-type magnetic core which is manufactured by one or a plurality of metal soft magnetic powder. The particle diameter is 5mu m-180mu m; the outer diameter of the can-type magnetic core is 4cm-15cm; the thickness of the can wall is 2mm-2cm; the thickness of the bottom is 5mm-3cm; the height is 2cm-15cm; and the side face of the can-type magnetic core is provided with a notch of 10mm-20mm. Compared with the prior art, the metal magnetic powder core can-type magnetic core provided by the invention is manufactured by adopting the plurality of metal soft magnetic powder, has favorable direct current superposition characteristics, excellent electromagnetic shielding properties, extremely low magnetic core loss, and higher coiling window utilization ratio.

Description

【Technical field】 [0001] The invention belongs to the technical field of metal soft magnetic powder, and in particular relates to a pot-shaped magnetic core made of metal soft magnetic powder and a production method of using the pot-shaped magnetic core to produce a magnetic core with high DC superposition characteristics. 【Background technique】 [0002] Can-type magnetic cores are widely used in active power filters, high-power UPS, solar photovoltaic and wind power inverters, and high-power filter inductors in elevator filter circuits, while can-type magnetic cores usually use metal soft magnetic cores. Materials include metal magnetic powder cores, silicon steel sheets and amorphous cores, which can be classified into chip cores, EE-type cores, U-type cores and toroidal cores. [0003] Silicon steel sheet magnetic core or amorphous magnetic core can be used in reactors. The working frequency of silicon steel sheet is generally less than 5kHz or less; the working frequency...

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Problems solved by technology

[0003] Silicon steel sheet magnetic core or amorphous magnetic core can be used in reactors. The working frequency of silicon steel sheet is generally less than 5kHz or less; the working frequency of amorphous magnetic core is generally less than 50kHz, but whether it is silicon steel sheet or amorphous magnetic core, Due to the high loss or high hysteresis expansion coefficient, and the magnetic core needs to open the air gap and non-closed magnetic circuit, the temperature rise of the magnetic core is high during work or there is obvious noise and electromagnetic radiation during work.

In order to overcome the above problems, it is necessary to increase the size of the product to reduce the temperature rise or reduce the noise, which greatly increases the cost

[0004] The annular metal soft magnetic core can meet the above applications, and the size requires a magnetic core with an outer diameter of 77-100mm or more. Usually, one annular product cannot meet the requirements for use, and usually three or even more than five products can be used at the same time. At the same time, since this kind of inductance is usually a copper wire with a thicker wire diameter, it is difficult to wind the ring core. If the ply wire is used, the filling factor of the winding wire will be very small, resulting in a power loss of the inductor. Disadvantages such as low density and poor appearance

Moreover, due to the limitation of the maximum size of the magnetic ring, it is difficult to design an inductor that meets the requirements when the current is greater than 100A

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