Electric Motor End Cap Mounting for Cooling and Strength
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Solution Overview
Problem
Traditional electronically commutated motors face space constraints and limited cooling capabilities due to bolts outside the stator and a size-limited cooling fan within the stator, hindering miniaturization and efficiency.
Innovation Solution
The motor design fixes end caps to the stator core without bolts passing through, using bearings mounted outside the end caps and locking members to secure them, allowing for improved cooling by positioning a fan outside the stator and redirecting axial forces to compress the connection, enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If bolts are used to fix end caps to the stator core, then the connection is secure, but extra space is occupied and miniaturization is hindered
Solution Approach 1:
The invention extracts the bearing from the traditional internal mounting position and relocates it to mount on the outer surface of the end cap. This removes the need for bolts passing through the stator core, eliminating the fastening structure that occupied space and complicated the design, thereby enabling miniaturization
2Temperature
If the cooling fan is located inside the stator, then the structure is compact, but the fan size is limited and cooling capability is reduced
Solution Approach 1:
The invention moves the cooling fan from the internal axial space of the stator to the external radial space, mounting it on the outer surface of the end cap. This dimensional relocation allows the fan to be much larger without increasing the stator's internal volume, significantly improving cooling capability
3Strength
If bolts pass through the stator core to fix end caps, then the connection is strong, but stress on the connection is high and reliability is reduced
Solution Approach 1:
Instead of using bolts that pull the end caps together through the stator core (creating tensile stress and potential damage), the invention inverts the approach by using bearings mounted on the outer surface to clamp the end caps to the stator core from the outside, creating compressive contact pressure that is more reliable and causes less damage
Data Source
AI summary
An electric motor includes a stator and a rotor rotatably installed in the stator. The stator includes a pair of end caps disposed at opposite ends thereof, and a pair of bearings respectively fixed to outer surfaces of the end caps from outside thereof. The rotor includes a shaft pivotally supported by the bearings.