Motor Cover Retention via Partition Insertion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional DC motors experience issues with the protection cover coming off from the frame due to insufficient fitting force, leading to potential malfunctions and exposure of electronic components.
Innovation Solution
The motor design incorporates a partition part with an insertion portion and a projecting portion that securely engages the cover with the frame, utilizing a stepped portion and notch configuration to prevent the cover from detaching, along with a base plate and bracket system for stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protection cover is fixed to the frame by fitting projecting portions on the cover into notches on the frame, then the assembly is simple and compact, but the fitting force is insufficient causing the cover to come off
Solution Approach 1:
The partition part is divided into multiple functional elements: a body portion with notches for basic positioning, and a separate protruding portion that extends into the frame's recessed portion. This segmentation allows each element to perform its specific function - the notches provide alignment while the protruding portion provides secure retention, resolving the contradiction between simple assembly and reliable fixation.
Solution Approach 2:
The solution transitions from a two-dimensional surface fitting (projecting portions on the cover surface fitting into notches on the frame surface) to a three-dimensional engagement (protruding portion extending axially into the recessed portion of the frame). This dimensional change creates positive mechanical interlocking that significantly increases fitting force while maintaining assembly simplicity.
2Volume of moving object
If the members constituting the frame and protection cover have thin thickness, then the motor structure is compact, but the fitting force between projecting portions and notches is small
Solution Approach 1:
Instead of increasing the thickness of the cover or frame members (which would increase volume), the solution creates a three-dimensional engagement by extending the protruding portion axially into the recessed portion. This provides strong mechanical interlocking through depth rather than width, maintaining compactness while significantly increasing fitting force.
Solution Approach 2:
The protruding portion of the partition part is nested within the recessed portion of the frame, creating a nested structural relationship. This allows the thinner members to achieve strong connection through the nested engagement, where the protruding portion fits into the recessed space without requiring increased member thickness.
Data Source
AI summary
A motor includes a rotor, a frame accommodating the rotor, a cover provided at one of two ends of the frame in a direction of a rotor axis, an internal space formed by the frame and the cover and a partition part partitioning the internal space into two spaces. The partition part includes an insertion portion. A part of the cover is inserted into the insertion portion.