Manufacturing device for an embedded magnetic core

The use of chromium nitride layers on the manufacturing device components addresses the expense and wear issues of existing devices, enhancing durability and productivity in producing embedded magnetic cores for rotating electrical machines.

DE112018007540B4Active Publication Date: 2026-05-28KURODA PRECISION INDS
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Patent Information

Application Number
DE112018007540
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2018-11-07
Publication Date
2026-05-28
Estimated Expiration
2038-11-07

AI Technical Summary

Technical Problem

Existing manufacturing devices for embedded magnetic cores in rotating electrical machines are expensive due to the use of hard metals like cemented carbide and chrome plating, which suffer from abrasion and removability issues, especially when using epoxy resin with inorganic fillers.

Method used

The manufacturing device employs chromium nitride layers on the inner peripheral surfaces of the resin vessel chamber, sprue, and connecting channels to improve abrasion resistance and removability without using hard metals, enhancing durability and productivity.

Benefits of technology

The chromium nitride layers enhance the durability and removability of the manufacturing device components, reducing wear and improving the productivity of embedded magnetic cores, particularly with epoxy resin and inorganic fillers, without the need for costly hard metals.

✦ Generated by Eureka AI based on patent content.

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Abstract

Manufacturing device (10) for an embedded magnetic core (1), wherein the embedded magnetic core (1) comprises a rotor core (2) having a magnet insertion hole (4) with a through hole opening into both axial end surfaces (2A) of the rotor core (2), a magnet (5) arranged in the magnet insertion hole (4), and resin (6) filling the magnet insertion hole (4), wherein the manufacturing device (10) comprises: a support base (32) which includes a surface (56A) into which a resin vessel chamber (64) opens, which is designed to store molten resin (8); a separate plate (36) configured to be placed on one surface (56A) of the support base (32), with the rotor core (2) placed on the separate plate (36), and having a connecting channel (50, 52) configured to connect the magnet insertion hole (4) and the resin vessel chamber (64); and a piston (62) which is movably provided in the resin vessel chamber (64) to feed the molten resin (8) in the resin vessel chamber (64) into the magnet insertion hole (4) by pressing through the connecting channel (50, 52), wherein at least a part of the inner peripheral surfaces of the resin vessel chamber (64) and the connecting channel (50, 52) and an outer peripheral surface of the piston (62) is formed by a chromium nitride layer (47, 49, 59, 65); wherein the separate plate (36) includes a sprue plate (46) and a reject plate (48) which are placed one above the other and are removable from each other, the connecting channel (50, 52) includes a sprue (50) formed in the sprue plate (46) and a ejection opening (52) formed in the ejection plate (48) and The inner peripheral surfaces of the gate (50) and the ejection port (52) are each formed by the chromium nitride layer (47, 49).
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Citation Information

Patent Citations

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    JP2017007353A

  • Device, Method, and Jig for Manufacturing Magnet Embedded Core

    US20200099278A1

  • Magnet inserting apparatus for magnet insertion into magnet insertion slots of rotor core and method thereof

    US9712025B2

  • Manufacturing method of magnet-embedded core, magnet-embedded core manufacturing device and manufacture jig

    WO2017179547A1