Electric motor and method for assembling an electric motor

The electric motor's innovative distributed winding method with alternating rectangular and V-shaped slots and controlled coil positioning addresses coil thickening and overlap issues, achieving miniaturization and efficient winding operations.

JP7875047B2Active Publication Date: 2026-06-17MITSUBA CORP
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Patent Information

Application Number
JP2022101241
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-06-23
Publication Date
2026-06-17
Estimated Expiration
2042-06-23

AI Technical Summary

Technical Problem

Existing electric motors using distributed winding methods face issues with coil thickening and increased size due to axial overlap, and pre-forming coils in a frame shape complicates efficient winding operations.

Method used

The electric motor employs a distributed winding method with air-core coils inserted into slots of differing shapes, including rectangular and V-shaped slots, where one coil end portion is positioned radially outward from the other, preventing axial overlap and allowing for efficient winding without thickness increase.

Benefits of technology

This configuration minimizes motor size and enhances winding efficiency, reducing manufacturing costs and improving torque characteristics while maintaining orderly coil arrangement.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide an electric motor and a method for assembling an electric motor, capable of achieving miniaturization by suppressing the protruded winding of a coil caused by using a distributed winding method and also capable of achieving an improvement in efficiency of coil winding work.SOLUTION: An electric motor includes a stator 3 including a plurality of stator salient poles 10 and a plurality of slots, and a plurality of air core coils 20 wound around the stator 3. Each of the air core coils 20 includes a first slot insertion part 21 and a second slot insertion part 22 which are inserted into the two slots, respectively and two coil end parts 23 that are respectively bridged over the slot insertion parts 21, 22. Only one of the slot insertion parts 21, 22 is inserted into one slot, and the second slot insertion part 22 in any air core coil 20 is disposed on the radially outer side of the first slot insertion part 21 in other air core coils 20.SELECTED DRAWING: Figure 3
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Citation Information

Patent Citations

  • Switched reluctance motor

    JP2002272071A

  • Armature and dc motor having armature

    JP2003324926A

  • Switched reluctance motor

    JP2007143286A

  • Switched reluctance motor

    JP2008099521A

  • Continuously wound coil, stator, manufacturing tool for the continuously wound coil and method of manufacturing the continuously wound coil

    JP2008109737A