Driving Device Heat Radiating Gel Management
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Solution Overview
Problem
Existing driving devices face challenges in achieving optimal heat radiating performance for switching elements and ensuring smooth rotation of the rotating shaft due to inadequate or excessive heat radiating gel, which affects both thermal management and mechanical functionality.
Innovation Solution
The driving device integrates an electric power converting circuit with the electric motor, utilizing a printed circuit board and sensor-neighboring mounted parts to manage the heat radiating gel, preventing it from adhering to the rotating shaft by redirecting its flow and ensuring effective heat dissipation without compromising mechanical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat radiating gel is excessively adhered to the switching elements, then heat radiating performance is improved, but the gel may be adhered to the rotating shaft and prevent smooth rotation
Solution Approach 1:
A protrusion is provided on the motor housing that acts as an intermediary barrier to prevent the heat radiating gel from directly contacting the rotating shaft. The gel is contained between the switching element and the protrusion, ensuring thermal contact while blocking the gel's path toward the rotating shaft, thus resolving the contradiction between heat radiating performance and smooth rotation.
2Ease of operation
If heat radiating gel is insufficiently adhered to the switching elements, then smooth rotation of the rotating shaft is maintained, but heat radiating performance decreases
Solution Approach 1:
The protrusion on the motor housing serves as a barrier that contains the heat radiating gel within the space between the switching element and the protrusion. This ensures that even a moderate amount of gel provides sufficient thermal contact for effective heat radiating performance while preventing the gel from reaching the rotating shaft and interfering with its smooth rotation.
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 solution enhances both heat radiating performance and smooth rotation of the shaft, maintaining efficient thermal management and mechanical functionality while avoiding structural complexity, thus improving the overall performance of the driving device.
Implementation Method 1
heat radiating gel is provided for thermally connecting the switching elements to the motor housing... heat generated at the switching elements is effectively radiated from the motor housing to an outside of the driving device
Data Source
AI summary
A driving device includes an electric motor, a rotating shaft, a motor housing, a printed circuit board, an electric power converting circuit, a rear frame end working as a heat radiating member, gel working as a heat transfer member, multiple mounted parts and so on. The heat radiating member is located on a side of the printed circuit board and facing a motor-side surface of the printed circuit board, to which multiple switching elements are mounted. The gel is plastically deformed and adhered to the switching elements and the heat radiating member for transferring heat of the switching elements to the heat radiating member. At least one of the mounted parts is mounted to the printed circuit board and located at a position between a through-hole opposing area and one of the switching elements, which is located at a position closest to a rotational angle sensor mounted to the printed circuit board in the through-hole opposing area.