Electronic Oil Pump Grounding Structure for EMI Reduction
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Solution Overview
Problem
Electronic oil pumps generate electromagnetic radiation that interferes with nearby electronic components and external devices, affecting their performance.
Innovation Solution
The electronic oil pump incorporates a conductive pump housing with the stator core and circuit board assembly grounded to a conductive portion, utilizing a conduction member that forms an external ground terminal to reduce electromagnetic radiation interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the stator assembly and circuit board assembly are equipped in the electronic oil pump, then the pump can provide power source for lubrication and cooling systems, but electromagnetic radiation is generated that interferes with electronic components and external devices
Solution Approach 1:
The patent utilizes the conductive pump housing to convert the harmful electromagnetic radiation into beneficial grounding paths. The housing serves dual purposes: maintaining pump structural integrity and providing electromagnetic shielding by directing radiation to ground terminals, thus converting the harmful effect into a protective function.
Solution Approach 2:
The conductive pump housing acts as an intermediary between the electromagnetic radiation sources (stator assembly and circuit board assembly) and the external environment. It provides a controlled path for electromagnetic energy discharge through grounding terminals, preventing direct interference with external electronic components while maintaining the pump's operational functionality.
2Object-generated harmful factors
If grounding measures are implemented to reduce electromagnetic radiation, then interference with external devices is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent merges the grounding function with the existing pump housing structure. Instead of adding separate grounding components, the housing itself is made conductive and integrated with grounding terminals, combining structural support and electromagnetic shielding functions into a single unified component, thereby minimizing additional complexity.
Solution Approach 2:
The conductive pump housing serves multiple functions simultaneously: it maintains the pump's structural integrity, provides electromagnetic shielding, and acts as a grounding path. This multi-functionality reduces the need for additional dedicated grounding components, thereby limiting the increase in device complexity while achieving effective electromagnetic interference reduction.
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 minimizes electromagnetic radiation from the stator and circuit board assemblies, reducing interference with electronic components and external devices.
Implementation Method 1
During the operation of the electronic oil pump, the circuit board assembly and/or the stator assembly may generate electromagnetic radiation
Implementation Method 2
at least one of a stator core of the stator assembly and a reference ground layer of the circuit board assembly is electrically connected to a conductive portion in the pump housing
Data Source
AI summary
An electronic oil pump includes a stator assembly, a circuit board assembly, and a pump housing. The pump housing is at least partially conductive, and at least one of a stator core of the stator assembly and a reference formation of the circuit board assembly is electrically connected to the conductive portion in the pump housing. The electronic oil pump further comprises a conduction member, the conduction member is fixedly connected or limited to the pump housing, a portion of the conduction member is electrically connected to the conductive portion in the pump housing, and at least a portion of the outer surface of the remaining portion of the conduction member forms a portion of the outer surface of the electronic oil pump.