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
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MITSUBA CORP
- Filing Date
- 2022-06-23
- Publication Date
- 2026-06-17
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.
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Smart Images
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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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