Stator-Integrated Housing Annular Portion for Sealing
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Solution Overview
Problem
Existing induction motors with stator-integrated housing face challenges in forming a complete seal between the stator and housing, allowing cutting fluid to infiltrate due to large contact areas and inadequate bolt tightening methods.
Innovation Solution
The electric motor design incorporates an annular portion on the housing surface with varying heights around fastening member insertion holes, ensuring uniform surface pressure and a narrower contact area to prevent fluid infiltration, using fastening members like bolts and nuts to securely clamp the stator between the front-side and rear-side housings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large contact area between stator and housing is used, then the clamping force is distributed over a larger area, but the sealing effectiveness deteriorates due to inadequate surface pressure
Solution Approach 1:
The housing surface is designed with localized protrusions that create concentrated contact points with the stator. These protrusions have different heights and are positioned at specific locations to generate high surface pressure locally, ensuring effective sealing despite the overall large contact area between stator and housing
Solution Approach 2:
The surface geometry of the housing is modified by adding protrusions with varying heights. This changes the pressure distribution parameter from uniform to non-uniform, creating high-pressure zones at the protrusion contact points that effectively seal gaps while maintaining a large overall contact area
2Ease of manufacture
If conventional bolt tightening methods are used, then the assembly process is simple, but the sealing performance deteriorates due to non-uniform pressure distribution
Solution Approach 1:
Protrusions are strategically positioned near the bolt insertion holes to ensure that the tightening force from conventional bolt methods is converted into concentrated local pressure. This localized pressure enhancement at critical sealing points achieves effective sealing even with simple bolt tightening procedures
Solution Approach 2:
The protrusions act as intermediary elements between the bolts and the stator. They transform the distributed clamping force from conventional bolt tightening into concentrated localized pressure, mediating between the simple tightening process and the required sealing performance
Data Source
AI summary
An electric motor includes: a rotor; a stator disposed on an outer peripheral side of the rotor; a front-side housing provided with an opening housing a part of the rotor; a rear-side housing clamping the stator between the rear-side housing and the front-side housing; a plurality of fastening members fastening the stator, the front-side housing, and the rear-side housing together; and an annular portion disposed on a surface, of the front-side housing, the surface facing the stator and having an annular shape that surrounds the opening, wherein respective heights of first sections of the annular portion that are in the vicinity of insertion holes of the fastening members are lower than respective heights of second sections, which are positioned at middle points between an adjacent pair of the first sections, among the first sections, the intermediate point is close to the adjacent pair of the first sections.