Motor Stator Core Circumferential Positioning Recesses
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Solution Overview
Problem
The existing motor manufacturing process faces complications in accurately coupling the stator core to the frames due to misalignment issues, leading to defects when the circumferential positioning is not maintained correctly, especially when the armature winding ends are separated by 180 degrees.
Innovation Solution
The motor design incorporates circumferential positioning recesses on the stator core and frames, allowing for precise alignment using a jig, and includes erroneous coupling restriction portions to ensure correct axial coupling only when the stator and frames are aligned in the predetermined circumferential position, preventing misalignment and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If circumferential positioning structure is added to restrict rotation, then positioning precision is improved, but device complexity increases and coupling process becomes complicated
Solution Approach 1:
The patent applies asymmetry by providing circumferential positioning recesses at different axial positions on the stator core and frames. Specifically, the first frame has a positioning recess at its axial end, the second frame has a positioning recess at its axial end, and the stator core has positioning recesses at both axial ends. This asymmetric arrangement ensures that the stator core can only be coupled in the correct circumferential orientation, preventing 180-degree misalignment while maintaining a relatively simple coupling structure.
Solution Approach 2:
The patent implements preliminary action by pre-forming the circumferential positioning recesses on the stator core and frames before the coupling process. These recesses are prepared in advance at specific axial positions and circumferential locations, so that when coupling occurs, the components automatically align in the correct circumferential orientation without requiring additional positioning operations or complex restraining structures during the coupling process.
2Ease of manufacture
If simple axial coupling is used without circumferential positioning, then coupling process is simplified, but manufacturing precision deteriorates leading to erroneous coupling
Solution Approach 1:
The asymmetric distribution of positioning recesses at different axial positions creates a unique fit geometry that allows simple axial coupling while ensuring correct circumferential alignment. The stator core's positioning recesses at both ends match with the corresponding recesses on the frames, creating a single correct assembly orientation without requiring complex positioning operations.
Solution Approach 2:
The positioning recesses are designed to enable self-alignment during the coupling process. When the stator core is axially coupled to the frames, the recesses automatically guide the components into the correct circumferential orientation without requiring external positioning devices or operations. The structure itself provides the positioning function, eliminating the need for additional circumferential positioning steps.
3Productivity
If stator core is coupled without circumferential positioning, then coupling speed is improved, but reliability deteriorates due to potential 180-degree misalignment
Solution Approach 1:
The asymmetric positioning recess arrangement provides inherent mechanical guidance that prevents 180-degree misalignment. The recesses are positioned such that only the correct circumferential orientation allows proper engagement, making erroneous coupling physically impossible while maintaining a fast, simple axial coupling process.
Solution Approach 2:
The positioning recesses are pre-configured on all components before assembly, establishing the correct circumferential relationship in advance. This preliminary positioning configuration ensures that when coupling occurs at high speed, the components automatically achieve correct alignment without requiring slower, more careful positioning operations.
Data Source
AI summary
A motor includes a stator, a first frame, a second frame, and a fastening member. The stator includes a stator core including a plurality of teeth extending radially inward and an armature winding wound around the teeth. The first frame is arranged to cover one axial end surface side of the stator. The second frame is arranged to cover another axial end surface side of the stator. The fastening member fastens the first frame and the second frame to each other with the stator core held by the first frame and the second frame in the axial direction. The circumference of the stator core and the circumference of at least one of the first frame and the second frame each include a circumferential positioning recess. The circumferential positioning recess is arranged at a circumferential reference position and is outwardly open in the radial direction.