Capacitive Module Housing Integration for Inductance Reduction
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Solution Overview
Problem
Existing rotating electrical machines face challenges in optimizing the integration of capacitive modules within strict space constraints under the hood of motor vehicles, particularly due to high voltage variations caused by pulse width modulation, which require effective reduction of wiring inductance.
Innovation Solution
The integration of a capacitive module with a housing that includes a negative terminal and connection traces, mechanically and electrically connected to the outer casing, along with a positive terminal and connection means that simplify the connection to the B+ terminal, optimizing the size and integration of the capacitive module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitive filter module is introduced to reduce wiring inductance, then voltage variations are reduced, but the device complexity and space requirements increase
Solution Approach 1:
The capacitive module is merged with the electronic unit housing, where the housing serves dual purposes as both structural enclosure and capacitive element. The housing includes connection traces that directly connect to the power modules, eliminating the need for separate wiring and reducing inductance while maintaining voltage stability.
Solution Approach 2:
The housing of the capacitive module is designed to perform multiple functions: it provides mechanical protection for the capacitors, serves as an electrical connection component through integrated traces, and acts as a mounting structure within the electronic unit. This multi-functionality reduces overall device complexity.
2Reliability
If the capacitive module is integrated with connection traces and terminals, then wiring inductance is reduced, but the manufacturing complexity increases
Solution Approach 1:
The capacitive module is designed as a separate, self-contained unit with its own housing, connection traces, and terminal. This segmentation allows the module to be manufactured and tested independently before integration into the electronic unit, simplifying the overall manufacturing process despite the complex internal structure.
Solution Approach 2:
The capacitors are housed within a dedicated housing that contains the connection traces and terminal. This nested structure allows compact integration while maintaining clear manufacturing boundaries - the capacitive module can be assembled as a nested unit and then integrated into the larger electronic unit.
3Ease of operation
If the capacitive module housing includes integrated connection traces, then the connection to power modules is simplified, but the housing design complexity increases
Solution Approach 1:
The connection traces are merged directly into the housing structure, eliminating the need for separate connection components. The housing itself becomes the electrical connector, with traces formed as integral parts of the housing that directly connect to the power modules, simplifying the connection process.
Solution Approach 2:
The housing serves as both a protective enclosure and an electrical connection component. By integrating the connection traces into the housing, the same structural element performs dual functions, reducing the total number of components needed while maintaining simple connections.
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 configuration effectively reduces wiring inductance, optimizing the capacitive module's integration and size within the limited space, thereby mitigating voltage variations and enhancing the performance of the rotating electrical machine.
Implementation Method 1
at least one capacitive module comprising at least one capacitor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6a
AI summary
The invention mainly relates to a rotary electrical machine (1) having an axis (X), for a motor vehicle provided with a battery, including: an outer housing (5), a built-in electronic unit (10) having a positive terminal B+ (26) intended to be connected to the positive terminal of the vehicle battery, at least one capacitive module (23) including at least one capacitor (34) and a housing (33) receiving said capacitor (34), characterized in that said housing (33) includes a negative terminal and a first so-called negative connection track that is connected to the negative polarity of the capacitor (34) and to the negative terminal of said housing (33), and in that said electrical machine further includes attachment means (39) that mechanically and electrically connect said negative terminal of said housing (33) to a portion of said outer housing (5) that forms a ground.