Solenoid coil, manufacture method thereof and stepping motor

Abstract

The invention discloses a solenoid coil, a manufacture method thereof and a stepping motor. The solenoid coil comprises a pair of coil skeletons, a pair of enamelled wires, a pair of electromagnetic polar plates, a pair of stator shells, an injection body, a shell and a filling body, wherein the injection body extends out of two ends of the stator shells, and a first connection part is formed on the outer side of the upper end surface of the injection body; a second connection part is formed on the side wall of the inner side of an upper end; the shape and the position of the second connection part correspond to those of the first connection part, and the second connection part and the first connection part are fixedly connected; the filling body is filled between the injection body and the shell and filled in gaps in the stator shells and is obtained by solidifying fluid material. According to the solenoid coil provided by the invention, external encapsulating structure is realized. The technology for realizing the structure is simple, a required die has simple structure, the sealing property of the shell is more reliable, the electric property and the insulating property of the solenoid coil are improved, and product reliability is improved.

Description

technical field [0001] Embodiments of the present invention relate to electromagnetic coil structure technology, in particular to an electromagnetic coil, a manufacturing method thereof, and a stepping motor. Background technique [0002] Solenoid coils are essential components in motors, motors, and other equipment. The basic functional components of the electromagnetic coil include a coil frame, an enameled wire wound on the coil frame, and an electromagnetic pole plate arranged between the two coil frames. The stator shell is buckled outside the coil frame wound with the enameled wire. The functional components of the above electromagnetic coils need to be packaged and fixed before they can become commonly used electromagnetic coils. The prior art mainly provides two packaging forms of electromagnetic coils. [0003] The first package form is an integral housing structure, which can be referred to Japanese Patent Application No. 2006-333664. The integral shell structur...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the integral shell structure is that: due to the need to rely on positioning parts and interference fit for positioning, the positioning structure on internal functional components such as the shell and stator shell is complicated, and generally needs to be prepared as a labyrinth structure; in addition, relying on interference fit for positioning positioning, resulting in a weak connection and a poor seal between the housing and functional components

[0006] The disadvantages of the outsourcing injection molding structure are: due to the need to match the shape of the welding part of the housing, the shape of the cable component installation position, and the external shape after the electromagnetic coil is packaged, and the injection material fills the gap space inside the two symmetrical stator shells, the mold required for injection molding The structure is more complex, and the injection molding process is complicated; in addition, due to the different materials of the encapsulation layer and the material of the stator shell, the expansion coefficients of heating and cooling are different, and cracking of the encapsulation layer may occur during use, so the performance requirements for injection molding materials are relatively high.

[0007] It can be seen that the prior art does not provide an electromagnetic coil with simple process structure and good packaging effect

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