Engine Fan Thermal Management via Conductive Potting
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Solution Overview
Problem
Internal combustion engine blowers face thermal overload issues due to extended operation times, risking motor failure from excessive winding temperatures, necessitating a solution for reliable long-term operation without overheating while maintaining simplicity and cost-effectiveness.
Innovation Solution
The stator windings are encapsulated with a thermally conductive potting compound, allowing heat dissipation through a common wall surface with the housing, which is actively cooled by the air flow, and the electronics are directly attached to the intake manifold for enhanced heat dissipation, utilizing a thermally conductive plastic with fillers for improved thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the blower is operated for extended periods to meet pollutant reduction requirements, then the service life and pollutant reduction capability are improved, but the thermal load on the electric motor increases causing winding temperature to exceed permissible limits
Solution Approach 1:
The patent converts the harmful thermal energy generated by the stator windings into beneficial cooling by directing it toward the inlet channel wall where air intake occurs. The thermally conductive potting compound transfers heat from the windings to the stator plate, which then conducts heat to the inlet channel wall, utilizing the incoming air flow to dissipate the heat that would otherwise cause overheating during extended operation
Solution Approach 2:
The patent introduces thermally conductive potting compound as an intermediary material between the stator windings and the stator plate. This compound has high thermal conductivity to efficiently transfer heat from the windings through the stator plate to the inlet channel wall, acting as a thermal bridge that enables effective heat dissipation during prolonged blower operation
2Temperature
If additional cooling structures are added to the housing to dissipate heat, then the thermal management is improved, but the device complexity and production costs increase
Solution Approach 1:
The patent makes the inlet channel wall serve multiple functions: it acts as both the air intake passage boundary and a heat dissipation surface. The stator plate is positioned such that its outer surface forms part of the inlet channel wall, allowing the same structural element to perform both flow guidance and thermal management functions, thereby avoiding additional cooling structures
Solution Approach 2:
The patent merges the stator mounting structure with the inlet channel wall by positioning the stator plate such that its outer surface becomes part of the inlet channel wall. This integration combines the structural support function with the heat dissipation function, eliminating the need for separate cooling components and reducing overall device complexity
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 significantly extends the blower's operational time by effectively reducing thermal heating, ensuring reliable operation without overheating, while maintaining efficiency and low energy consumption with pulsation-free flow.
Implementation Method 1
the heat generated in the stator windings is immediately dissipated. The heat flow takes place from the windings to the highly thermally conductive potting compound, which is made in particular of plastic with fillers, and from there via the likewise thermally conductive stator plate to the surrounding housing
Implementation Method 2
This is immediately cooled by the sucked-in air, since the intake port has the same wall surface as the housing
Data Source
Figure 1
AI summary
Fans for internal combustion engines are known, which comprise an electric motor (16) having a stator (18), which has a stator lamination (20) on which stator windings (22) are arranged, and having a rotor (24), which is fastened to a drive shaft (10), having a housing (44), which surrounds the electric motor (16), having a conveying channel (46, 40), which is formed in the housing (44), having an intake manifold (66), which delimits an inlet channel (50), and having an outlet connection (54), which delimits an outlet channel (52), having an impeller (12), which is fastened on the drive shaft (10) and via which fluid can be conveyed from the inlet channel (50) via the conveying channel (46, 40) to the outlet channel (52).