Canned Electric Motor Separating Can Axial Support
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Solution Overview
Problem
Existing canned electric motors for coolant pumps in motor vehicles face reliability issues due to loose press-fitting connections caused by motor vibrations, leading to coolant leakage and potential damage to the electromagnetic motor stator and electronics, which can result in pump malfunction and engine damage.
Innovation Solution
A canned electric motor design featuring a static motor frame with a directly fixed stator body, a separating can supported radially by both the stator body and motor frame, eliminating the need for additional fixing means and minimizing the risk of leakage, and utilizing a thermosetting plastic separating can to maintain a small air gap for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a press-fitting connection is used to fix the separating can, then the assembling process is simplified, but the connection becomes loose due to motor vibrations causing coolant leakage
Solution Approach 1:
A retaining ring is introduced as an intermediary component between the separating can and the motor frame. The retaining ring receives the separating can in a radially inward direction and fixes it axially, mediating the connection between these two components. This resolves the contradiction by providing a simple assembly process (the retaining ring can be easily installed) while ensuring reliable fixation against vibrations (the retaining ring prevents axial movement and loosening).
Solution Approach 2:
The fixing mechanism is segmented into distinct functional components: the retaining ring with fixing elements that engage with the motor frame, and the separating can with its axial support. This segmentation allows each component to perform its specific function optimally - the retaining ring provides vibration-resistant fixation while the separating can maintains fluidic separation, resolving the contradiction between easy assembly and reliable connection.
2Reliability
If additional fixing means are used to secure the separating can, then connection stability is improved, but device complexity increases
Solution Approach 1:
The retaining ring serves multiple functions simultaneously: it fixes the separating can axially, prevents loosening due to vibrations, and maintains the fluidic separation between coolant and motor chambers. By making this single component multi-functional, the patent achieves reliable connection stability without significantly increasing device complexity, as the retaining ring integrates several functions that would otherwise require multiple separate components.
3Ease of manufacture
If the separating can is loosely fixed, then assembly is easier, but coolant leakage occurs damaging the motor stator and electronics
Solution Approach 1:
The retaining ring acts as an intermediary that ensures the separating can is properly secured without complicating assembly. The fixing elements of the retaining ring engage with the motor frame to prevent axial movement, thereby preventing coolant leakage while maintaining assembly ease. The retaining ring can be installed in a simple manner while effectively eliminating the harmful effect of coolant leakage.
Data Source
AI summary
A canned electric motor for a fluid pump. The canned electric motor includes a static motor frame, a rotor shaft, a rotatable motor rotor which is co-rotatably connected with the rotor shaft, a static motor stator having a stator body which is directly fixed to the static motor frame, and a separating can which fluidically separates the static motor stator from the rotatable motor rotor. The separating can has a first axial support which protrudes radially from an outside of the separating can. The separating can is supported in a first axial direction by the stator body via the first axial support and in a second axial direction by the static motor frame. The first axial direction is opposite to the second axial direction.