Fuel Pump Ground Terminal Insulation
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Solution Overview
Problem
Existing fuel pump control circuits experience switching noise due to the switching of power supply phases (U, V, W) which is not effectively mitigated by current technologies.
Innovation Solution
A fuel pump design incorporating a brushless motor with a ground terminal held by a fixing member, insulated from supplying terminals, and electrically connected to a control circuit, which includes a conducting portion to shield switching noise and a spring member for effective grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ground terminal is added to the fuel pump to ground the control circuit, then switching noise is reduced and electromagnetic interference is suppressed, but the device complexity and structural complexity increase
Solution Approach 1:
The ground terminal is integrated with the fixing member that holds the supplying terminals. The fixing member simultaneously performs two functions: mechanically securing the supplying terminals and providing a ground connection path through the integrated ground terminal, thereby reducing overall device complexity while achieving effective grounding
Solution Approach 2:
The fixing member is designed to serve multiple purposes: it acts as a mechanical support structure for the supplying terminals, provides electrical insulation where needed, and incorporates the ground terminal to establish the ground connection. This multi-functional design avoids adding separate components for each function
2Reliability
If the ground terminal is insulated from the supplying terminals, then proper grounding is achieved and noise is reduced, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
A resin layer is used as an insulating barrier between the ground terminal and supplying terminals. This thin film structure provides effective electrical insulation while maintaining a compact design and allowing for relatively simple manufacturing processes such as molding or coating
Solution Approach 2:
The resin layer acts as an intermediary substance that provides electrical insulation between the ground terminal and supplying terminals. This mediator enables both terminals to coexist in close proximity while maintaining proper electrical isolation, simplifying the overall structure compared to completely separate mounting arrangements
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
The solution effectively suppresses switching noise emission and ensures proper grounding of the control circuit, reducing electromagnetic interference and improving operational stability.
Implementation Method 1
a ground terminal held by the fixing member in a state of being insulated from the plurality of the supplying terminals, wherein the ground terminal is electrically connected to a control circuit configured to control electric power supplied to the plurality of the supplying terminals
Implementation Method 2
a ground terminal held by the fixing member in a state of being insulated from the plurality of the supplying terminals
Data Source
AI summary
A fuel pump may be driven by a brushless motor. The fuel pump may include a core; three supplying terminals configured to supply electric power to a coil wire fixed to the core and wound around the core; a resin layer holding the three supplying terminals; and a ground terminal held by the resin layer in a state of being insulated from the three supplying terminals, wherein the ground terminal may be electrically connected to a control circuit configured to control electric power supplied to the three supplying terminals.