Throttle Valve Conductive Insert for Motor Housing ESD Access
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Solution Overview
Problem
Throttle valves with plastic housings pose challenges in testing the influence of electrostatic discharge from electric motors on electronic devices, as traditional electrostatic discharge guns cannot access the metal housing of the electric motor, and grounding issues prevent effective removal of electromagnetic interference.
Innovation Solution
A throttle valve design featuring a conductive insert with exposed components allows direct access for electrostatic discharge testing and grounding of the filter capacitor, enabling efficient testing and interference removal by connecting the electric motor connector to both the insert body and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a plastic housing is used to reduce weight, then the weight of the throttle valve is reduced, but the electrostatic discharge gun cannot access the metal housing of the electric motor for testing
Solution Approach 1:
A conductive insert is introduced as an intermediary element between the plastic housing and the electric motor. This insert provides a accessible testing surface that is electrically connected to the electric motor, allowing electrostatic discharge testing without requiring direct access to the motor housing. The insert acts as a mediator that bridges the gap between the non-conductive plastic housing and the need for electrical contact for testing.
2Weight of moving object
If a plastic housing is used to reduce weight, then the weight of the throttle valve is reduced, but the filter capacitor cannot be grounded to remove electromagnetic interference
Solution Approach 1:
The conductive insert serves as a grounding intermediary, providing a path to ground the filter capacitor connected to the electric motor. Since the insert is electrically connected to the motor and can be grounded externally, it enables the filter capacitor to function properly by providing a reference ground, even though the plastic housing itself cannot be grounded.
3Shape
If the metal housing of the electric motor is enclosed in the plastic housing, then the aesthetic appearance and integration are improved, but the electrostatic discharge cannot be transferred to the metal housing for testing
Solution Approach 1:
The conductive insert provides an accessible intermediary surface that maintains the integrated appearance of the plastic housing while enabling electrical contact for testing. The insert can be positioned to protrude slightly or provide a contact point on the housing surface, allowing testing without compromising the integrated design.
4Object-generated harmful factors
If the filter capacitor is connected to the metal housing, then electromagnetic interference can be removed, but the capacitor cannot be grounded when the motor is in a non-conductive plastic housing
Solution Approach 1:
The conductive insert serves as a grounding intermediary for the filter capacitor. The capacitor remains connected to the electric motor, and the insert provides an external grounding point that is electrically connected to the motor through the insert's electrical connection. This enables the capacitor to function as intended by providing a ground reference without requiring the plastic housing to be conductive.
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
Facilitates reliable testing of electrostatic discharge resistance and effective grounding of the electric motor, allowing for the removal of electromagnetic interference, while simplifying manufacturing and reducing costs through integrated design elements.
Implementation Method 1
one end of the electric motor connector is electrically connected to the insert body, and the other end is electrically connected to the electrically conductive housing of the electric motor
Implementation Method 2
a filter capacitor is usually provided between a positive/negative electrode of the electric motor and the metal housing of the electric motor to remove the electromagnetic interference in the electric motor
Data Source
AI summary
A throttle valve includes a housing, an electric motor and an insert. The electric motor is accommodated in the housing and drives opening and closing of an air flow passage of the throttle valve. The insert is partially enclosed in the housing and includes an electrically conductive insert body at least partially accessibly exposed from the housing, and an electrically conductive electric motor connector. One end of the motor connector is electrically connected to the insert body, and the other end thereof is electrically connected to the electrically conductive housing of the electric motor.