Auxiliary Motor Unit Grounding via Integrated Plug Pin Shielding
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Solution Overview
Problem
Existing electrical motor vehicle auxiliary units, such as pumps and actuators, face complexity and high manufacturing costs due to intricate construction requirements for effective electromagnetic interference suppression and grounding.
Innovation Solution
A simplified design featuring a punching comb arrangement for connecting the engine control electronics board to the engine control unit via a plug connection, where the housing mass element acts as a plug pin, establishing a direct and low-resistance ground connection without screws, enhancing electromagnetic shielding and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional grounding methods with separate housing ground elements and screws are used, then reliable electrical connection is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The housing ground element is merged with the punched comb arrangement by making the housing ground element a plug pin of the punched comb arrangement. This integration eliminates separate grounding components and their assembly, reducing device complexity while maintaining reliable electrical connection between the housing and circuit ground
Solution Approach 2:
The punched comb arrangement serves multiple functions: it provides both signal/power connections and housing grounding through its plug pins. The housing ground element acts as both a mechanical connector and an electrical ground path, reducing the overall component count while ensuring reliable grounding
2Reliability
If multiple separate grounding components and screws are used, then secure electrical connection is achieved, but assembly time and manufacturing cost increase
Solution Approach 1:
The housing ground element is integrated into the punched comb arrangement as a plug pin, combining multiple grounding operations into a single assembly action. This eliminates the need for separate screw fastening steps, significantly reducing assembly time while maintaining secure electrical connection
Solution Approach 2:
The housing ground element is pre-integrated into the punched comb arrangement during manufacturing, so that during assembly, the grounding connection is established automatically when the plug connection is inserted, eliminating the need for separate grounding assembly steps
3Reliability
If traditional grounding with screws is used, then reliable ground contact is achieved, but manufacturing cost and component count increase
Solution Approach 1:
The housing ground element is merged with the punched comb arrangement, eliminating the need for separate grounding components and screws. This reduction in component count directly lowers manufacturing costs while the integrated design ensures reliable ground contact through the plug connection mechanism
Solution Approach 2:
The traditional separate housing ground element and grounding screws are extracted from the design and replaced by the integrated punched comb arrangement with housing ground element as plug pin, simplifying the manufacturing process and reducing costs
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 achieves improved electromagnetic compatibility and shielding with a reduced component count, shorter assembly time, increased cleanliness, and cost-effectiveness by eliminating screws and simplifying the assembly process, while also enhancing cooling performance through fluid-based cooling of the partition wall.
Implementation Method 1
the plug connection is electrically connected to the engine control electronics board via a punched comb arrangement with at least two plug pins
Implementation Method 2
a common plug pin section is provided for the housing ground element and the vehicle ground element, wherein a free end of the plug pin is inserted into a recess of an electrically conductive housing part
Implementation Method 3
at least a part of the auxiliary unit housing is electrically conductive, so that the drive motor and the control and power electronics arranged on the engine electronics board are electrically shielded
Implementation Method 4
enhancing cooling performance through fluid-based cooling of the partition wall
Data Source
Figure 1
Figure 2
AI summary
The invention relates to an electric motor vehicle auxiliary unit (10), comprising an at least partially electrically conductive auxiliary unit housing (15), in which an electric drive motor (14) having stator-side motor coils (30), an aggregate mechanics (12) powered by the drive motor (14), a motor electronic circuit board (40) having a motor electronic provided with a control and power electronic (37) for controlling the drive motor (14). The motor electronic circuit board (40) has at least one housing mass connection (60), which is directly connected to the auxiliary unit housing in an electrically conductive manner via a housing mass organ (48). The motor control electronic circuit board (40) is connectable to a motor control unit via a plug connection (46), wherein the plug connection (46) is electrically connected to the motor control electronic circuit board (40) via a punch comb arrangement (44) having at least two plug pins (48, 54, 68, 60), wherein the housing mass organ is designed as a plug pin (48) of the punch comb arrangement (44).