Motor Stator Frame Deformation Control
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Solution Overview
Problem
The existing motor design is prone to deformation due to the large holding load applied by coupling members, which can lead to structural issues and inefficient heat dissipation.
Innovation Solution
The motor design includes a stator core with outer circumferential projections that are held between frames, allowing the coupling members to apply the holding load closer to the through bolts, thereby reducing the formation of a force couple and minimizing frame deformation, while also exposing the cylindrical portion of the stator core for improved heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coupling members are positioned at the radially outer side of the main circumferential portion to hold the stator core, then the stator core can be securely held between frames, but a force couple is formed causing frame deformation
Solution Approach 1:
The patent introduces held portions as intermediary elements between the coupling members and the main circumferential portion. These held portions extend in the radial direction and are positioned between the coupling members and the main circumferential portion, serving as a mediator that transfers the holding force while preventing direct formation of a force couple that would cause frame deformation.
Solution Approach 2:
The patent changes the spatial arrangement by extending held portions in the radial direction from the main circumferential portion. This dimensional extension allows the coupling members to apply holding force through a different spatial path, reducing the lever arm and minimizing the rotational moment that causes frame deformation.
2Strength
If frames are positioned to hold the main circumferential portion, then structural support is provided, but heat dissipation from the stator core is limited
Solution Approach 1:
The patent segments the stator core into functionally distinct parts: the main circumferential portion that provides structural support and is held between frames, and the held portions that extend radially outward. This segmentation allows different regions to serve different functions - structural support and heat dissipation - simultaneously.
Solution Approach 2:
The patent applies local quality by making the held portions extend in the radial direction with a specific configuration that optimizes heat dissipation in that local region. The held portions have different geometric properties compared to the main circumferential portion, creating localized areas optimized for thermal management while maintaining overall structural integrity.
Data Source
AI summary
A motor includes a stator having a stator core, a first frame and a second frame, which are arranged on two axial sides of the stator core, a coupling member, which couples the first and second frames at a radially outer side of the stator while applying a holding load to the first and second frames in the axial direction, and a rotor, which is arranged at a radially inner side of the stator. The stator core includes a held portion that projects toward a radially outer side from a main circumferential portion of the stator core. The first and second frames hold, in between, at least the held portion of the stator core in the axial direction.