Variable Speed Drive Bus Capacitor Cooling via Segmented Cover
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Solution Overview
Problem
Variable speed drives certified for IP54, IP55, or IP66 face cooling challenges for bus capacitors due to their sealed casing, which can reduce the device's service life.
Innovation Solution
A variable speed drive design featuring a main closure cover with openings for bus capacitors and a secondary removable closure cover with aeration slots to facilitate cooling while maintaining sealing, allowing air passage to cool the capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the variable speed drive is sealed to achieve IP54, IP55, or IP66 certification, then the sealing performance is improved, but the cooling of bus capacitors deteriorates
Solution Approach 1:
The closure cover is divided into two separate parts: a main closure cover that provides the sealed enclosure for IP rating certification, and a secondary closure cover that can be removed to access the bus capacitors. This segmentation allows the drive to maintain sealing performance while enabling cooling of the capacitors when needed.
Solution Approach 2:
The secondary closure cover is designed to be removable, transforming the static sealed enclosure into a dynamic structure that can switch between sealed and open states. This allows the system to adapt between maintaining IP rating and providing cooling access to the bus capacitors.
2Reliability
If the bus capacitors are enclosed inside the sealed casing, then the IP rating is maintained, but the service life of the variable speed drive is reduced
Solution Approach 1:
By segmenting the closure cover into main and secondary parts, the invention maintains the sealed enclosure for IP rating while providing access to the bus capacitors. This allows cooling of the capacitors to extend their service life without compromising the overall sealing performance of the drive.
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 enhances the cooling of bus capacitors, ensuring effective heat dissipation and extending the service life of the variable speed drive while maintaining the necessary sealing for IP ratings.
Implementation Method 1
the secondary closure cover comprises aeration slots
Data Source
AI summary
The invention relates to a variable speed drive (1) connected upstream to an electric power grid (R) and downstream to an electric motor (M), the variable speed drive comprising notably a main casing comprising a base (14) and a main closure cover (15) closing on the base (14), a rectifier module (10), an inverter module (11), these modules being inserted inside the casing, and one or more bus capacitors (13). The main closure cover (15) comprises one or more openings (151) each traversed by a bus capacitor (13) and the variable speed drive comprises a secondary closure cover (17) fitting onto the main closure cover (15) and covering the said one or more bus capacitors (13).