Electric Oil Pump Grounding Layout for EMI Reduction
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Solution Overview
Problem
Electronic oil pumps generate electromagnetic radiation that interferes with electronic components and external devices, affecting their performance.
Innovation Solution
An electronic oil pump design that includes a stator assembly, electric control board assembly, pump housing, and conductive member, where the conductive member electrically connects the reference ground plane of the electric control board assembly with the pump housing, providing a low impedance path for interference voltage and reducing electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the electric control board assembly is used to control the electric oil pump, then the control precision and automation are improved, but electromagnetic radiation is generated that interferes with electronic components and external devices
Solution Approach 1:
A conductive member is introduced as an intermediary element to provide an electrical connection between the reference ground plane of the electric control board assembly and the pump housing. This mediator creates a low-impedance path for electromagnetic interference currents, directing them to ground and preventing their propagation to external devices, thus resolving the contradiction between automation control and electromagnetic radiation.
Solution Approach 2:
The patent converts the harmful electromagnetic radiation into a beneficial grounding current path. By providing a dedicated low-impedance route through the conductive member, the electromagnetic interference energy is redirected to ground where it can be safely dissipated, transforming the harmful radiation into a controlled grounding current that protects electronic components.
2Productivity
If the electric control board assembly operates at high speed, then the productivity is improved, but the electromagnetic interference to electronic components increases
Solution Approach 1:
The conductive member serves as an intermediary grounding path that becomes increasingly important at higher operating speeds. As the electric control board assembly operates faster, more electromagnetic interference is generated, and the conductive member provides a scalable low-impedance path that can handle increased interference currents without compromising the productivity gains from high-speed operation.
3Object-generated harmful factors
If the reference ground plane is directly connected to the pump housing, then the electromagnetic radiation is reduced, but the device complexity increases
Solution Approach 1:
The pump housing itself is utilized as part of the grounding system, serving a dual function as both the mechanical housing and an electrical ground reference. The conductive member leverages the existing pump housing structure to provide grounding, eliminating the need for separate grounding components and reducing overall device complexity while still achieving electromagnetic radiation 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
Reduces electromagnetic interference and static electricity impact on electronic components and external devices by grounding electromagnetic radiation and static charges, enhancing the performance and reliability of the electronic oil pump system.
Implementation Method 1
the conductive member electrically connects a reference ground plane of the electric control board assembly with the pump housing
Implementation Method 2
the electric control board assembly may generate electromagnetic radiation
Data Source
AI summary
An electric oil pump comprises a stator assembly and an electronic control panel assembly which are electrically connected. The electronic control panel assembly comprises an electronic component. The electric oil pump further comprises a conductive pump housing and a conductive member that electrically connects a reference ground layer of the electronic control panel assembly and the pump housing. The above arrangement facilitates reducing electromagnetic radiation of the electronic control panel assembly, thereby reducing interference of the electromagnetic radiation of the electronic control panel assembly on the electronic component and/or other external devices.