Electric Pump Grounding Contact for Integrated EMC and ESD Paths
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Solution Overview
Problem
Existing electric pumps in automobiles face challenges in creating compact electrical grounding connections for Electro Magnetic Compatibility (EMC) and Electro Static Discharge (ESD) paths, leading to complex assemblies that increase time and cost.
Innovation Solution
An electric pump design incorporating a contact element made of one conductor that integrates EMC and ESD paths by electrically connecting the stator, grounding lead of the control substrate, and the conductive housing, using a contact element with multiple bases that are elastically deformable to provide mechanical support and simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate grounding connections are provided for EMC and ESD paths, then reliable electromagnetic compatibility and static discharge protection are achieved, but device complexity and assembly time increase
Solution Approach 1:
The patent combines separate EMC grounding connection and ESD grounding connection into a single integrated grounding connection. The grounding element has a first contact region for EMC grounding and a second contact region for ESD grounding, both connected through a common grounding path to the housing, thereby reducing assembly complexity while maintaining grounding reliability
Solution Approach 2:
The grounding element serves multiple functions simultaneously: it provides both EMC grounding and ESD grounding paths, connects to different contact regions (stator for EMC, control substrate for ESD), and interfaces with the conductive housing. This multi-functional design eliminates the need for separate grounding components
2Reliability
If multiple separate grounding components are used for EMC and ESD paths, then comprehensive electrical grounding is achieved, but the space occupied and manufacturing cost increase
Solution Approach 1:
The patent merges multiple grounding components into a single integrated grounding element that provides both EMC and ESD grounding functions. This consolidation reduces the total volume occupied by grounding components while maintaining comprehensive electrical grounding coverage
3Reliability
If complex grounding connections are implemented for EMC and ESD paths, then complete electromagnetic compatibility and static discharge protection are achieved, but manufacturing cost and assembly time increase
Solution Approach 1:
The patent combines multiple grounding operations into a single assembly step where the integrated grounding element is installed once to establish both EMC and ESD grounding paths simultaneously, significantly reducing assembly time while maintaining complete grounding protection
Solution Approach 2:
The grounding element is designed with pre-formed contact regions and grounding paths that are prepared during manufacturing. The first contact region, second contact region, and grounding path are all pre-configured, allowing for rapid installation without requiring complex assembly operations
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 reduces space, manufacturing, and assembly costs by creating an integrated grounding path that simplifies assembly and improves mechanical support, while effectively managing electromagnetic interference and static discharge.
Implementation Method 1
the contact element electrically connects the stator, the grounding lead of the control substrate and the conductive material of the housing
Implementation Method 2
the contact element is configured to be elastically deformable that stores the energy and dampen the mechanical vibration thereby improving a mechanical press fitting contact
Data Source
Figure 1~2
Figure 3A~3C
Figure 4A~4C
AI summary
The present subject matter relates to an electric pump (100) for automobile including a driving device (10), a pump device (50), a control substrate (30), a housing (111) and a contact element (20). The driving device (10) having a rotor (12) rotatable about an axis X and a stator (11). The pump device (50) is driven by the driving device (10). The housing (111) is accommodating at least the driving device (10), the control substrate (30) and the pump device (50), the housing (111) being formed at least of a conductive material. The control substrate (30) with a drive circuit for controlling the driving device (10) and a grounding lead. Further, the contact element (20) made of one conductor electrically connects the stator (11), the grounding lead of the control substrate (30) and the conductive material of the housing (111).