Motor-Driven Supercharger Stator Cooling Jacket
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Solution Overview
Problem
Conventional motor-driven superchargers with built-in electric motors face challenges in firmly fixing the stator without additional casings and in efficiently cooling both the compressor impeller and the electric motor, leading to complex structures and reduced cooling efficiency.
Innovation Solution
A motor-driven supercharger design where the stator assembly, comprising a motor stator and an outer sleeve, is integrated to constrain the motor stator's rotation and form a liquid-tight water cooling jacket between the sleeve and the bearing housing, allowing direct cooling and eliminating the need for additional casings and exclusive fixing parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator is gripped by two electric motor casings from both sides in an axial direction, then the stator can be firmly fixed, but additional casings are necessary and the structure becomes more complex
Solution Approach 1:
The patent merges the stator assembly with the bearing housing by providing a fixing portion that extends axially from the bearing housing to grip the stator. This integration eliminates the need for separate additional casings while maintaining firm fixing of the stator, thus resolving the contradiction between fixing reliability and structural complexity
Solution Approach 2:
The bearing housing is given a dual function: it not only supports the rotating shaft but also serves as a fixing structure for the stator through its extending fixing portion. This multi-functionality reduces the number of separate components needed, simplifying the overall structure while ensuring reliable stator fixation
2Volume of moving object
If the compressor impeller is close to the stator of the electric motor, then the overall size is reduced, but it becomes hard to cool both the compressor impeller and the electric motor
Solution Approach 1:
The patent segments the cooling system into separate cooling paths: one for the compressor impeller and another for the electric motor. By providing distinct cooling passages and coolant flow routes for each component, the design enables effective cooling of both elements even when they are positioned close together, thus resolving the contradiction between compact size and cooling efficiency
Solution Approach 2:
The patent introduces a cooling medium (coolant) as an intermediary to transfer heat away from both the compressor impeller and electric motor. The cooling passages serve as intermediary channels that enable thermal energy removal from closely positioned components without requiring physical separation, maintaining compact size while ensuring adequate cooling
3Reliability
If additional casings and exclusive fixing parts are used to fix the stator, then the stator can be securely fixed, but the assembly complexity increases
Solution Approach 1:
The patent combines the stator fixing function with the bearing housing structure by extending a fixing portion axially from the bearing housing. This merging eliminates the need for additional exclusive fixing parts and casings, reducing assembly complexity while maintaining secure stator fixation through the integrated structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design securely fixes the motor stator without additional casings, reduces assembly complexity, and enhances cooling efficiency by creating a direct water cooling path, improving overall performance and ease of assembly.
Implementation Method 1
the outer sleeve constructs a liquid tight water cooling jacket between the outer sleeve and the bearing housing
Data Source
AI summary
A motor-driven supercharger is provided with a stator assembly inserted and attached to a bearing housing, and a seal plate closely attached to a compressor side of the stator assembly and comparting between a compressor housing and a motor stator (24). The stator assembly has the motor stator and an outer sleeve having an inner peripheral surface closely attached to an outer peripheral surface of the motor stator and supporting the motor stator in such a manner as to constrain a rotation of the motor stator, wherein the motor stator and the outer sleeve form an integral part so as to construct the stator assembly, and the outer sleeve constructs a liquid tight water cooling jacket between the outer sleeve and the bearing housing. The outer sleeve and the seal plate are fastened together in an axial direction between the bearing housing and the compressor housing.