Magnetic circuit structure of high-central-field magnetic shoe mould

Abstract

The invention relates to a magnetic circuit structure of a high-central-field magnetic shoe mould, which comprises an upper punch head and a lower punch head, wherein the upper punch head and the lower punch head are made of magnetic-conducting materials, a magnetic-conducting material layer is respectively embedded between the molding surfaces of the upper punch head and the lower punch head anda basal body to form a magnetic-flux refracting surface, and the shape of the magnetic non-conducting material embedded layer of the upper punch head is formed from a line segment L and a line segment L1 at both sides and a line segment B at the top end, wherein the line segment L and the line segment L1are straight line segments, the line segment B is an arc line segment or a straight line segment, an included angle alpha is 50-72 degrees, the embedded shape of the lower punch head is formed from an arc line at the top end, straight lines at both sides and an arc line at the bottom side, andan included angle beta=2(90 degrees-alpha)+0-11). In the invention, the upper punch head and the lower punch head, made of the magnetic-conducting materials, are respectively embedded into the magnetic non-conducting material layer with the finely designed shape to form the more effective magnetic-flux refracting surface, thereby realizing that magnetic particles are subjected to the action of a more ideal polymerization magnetic field to carry out more appropriate orientation when a blank body is molded, realizing the high central field and the high middle-position surface magnet of a magnetic shoe and generating an active contribution to effectively improving the mechanical characteristic of a motor.

Description

technical field [0001] The invention relates to a magnetic circuit structure of a mold used for wet and dry forming of permanent ferrite magnets, in particular to a magnetic circuit structure capable of significantly increasing the central magnetic field intensity of a tile-shaped magnet. Background technique [0002] "Forming" in the process flow of permanent ferrite wet and dry production of tile-shaped magnets is the basic process that determines the shape and magnetic performance characteristics of the final product. The magnetic field intensity and distribution characteristics provided by the magnet to the air gap during use will have a greater impact on the operating characteristics of the micromotor. [0003] In the process of long-term cooperation with customers, we found from the information feedback from customers, such as Figure 6 The products installed in the motor casing 5 produced by the mold of the traditional magnetic circuit structure as shown usually show ...

AI Technical Summary

Problems solved by technology

As mentioned above, the performance of the final magnetic properties of the magnetic tile is closely related to the orientation of the forming magnetic field it receives during forming. The products produced by the mold designed in the traditional way are ultimately limited by the degree of magnetic concentration of the magnetic circuit. , so that the surface magnetic field strength and central field displayed by the finished product are not ideal, and the surface field strength on both sides of the inner arc surface is obviously greater than the median surface field strength

Such a surface magnetic field distribution makes the motor running characteristics such as torque and noise unsatisfactory after the magnetic tile is assembled into a motor

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