Magnetic cores, magnetic cores with coils, rotating electromachines and brushless motors
The elliptical or circular tooth design in magnetic cores alleviates stress on insulating films, enhancing electrical insulation and coil winding efficiency by preventing coating damage and reducing insulating treatment needs.
JP7868693B2Active Publication Date: 2026-06-02MURATA MFG CO LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MURATA MFG CO LTD
- Filing Date
- 2023-11-28
- Publication Date
- 2026-06-02
AI Technical Summary
Technical Problem
The existing magnetic cores with rectangular teeth design suffer from stress concentration on the insulating film at the vertices, leading to potential damage and reduced electrical insulation between the magnetic core and the coil.
Method used
The magnetic core design features elliptical or circular teeth shapes to alleviate stress concentration, incorporating non-contact surfaces and controlled bending angles during coil winding to prevent insulating coating damage.
Benefits of technology
This design effectively suppresses the decrease in electrical insulation between the magnetic core and coil by reducing stress on the insulating coating, minimizing the need for insulating treatment, and facilitating easier coil winding.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 0007868693000001 
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Abstract
This magnetic body core is for use in a rotary electric machine and comprises a tooth part having a shape extending in a first direction. The tooth part includes a wound part around which a coil is wound. The wound part has: a first protruding corner which the coil passes in the process of being wound; a first contact surface with which the coil comes into contact before the coil passes the first protruding corner and which has, as seen from the first direction, a shape curved so as to protrude in a second direction; a first non-contact surface with which the coil does not come into contact and of which the boundary with respect to the first contact surface is the first protruding corner; and a second contact surface with which the coil comes into contact after the coil passes the first protruding corner and which has, as seen from the first direction, a shape curved so as to protrude in a third direction different from the second direction.
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