Automotive Motor Shielding Housing Interference Suppression
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Solution Overview
Problem
Existing motor vehicle unit electric motors face challenges in effectively suppressing electromagnetic interference, particularly in mechanically commutated motors used for internal combustion engines, where external and integrated interference suppression methods have limitations in adaptability and effectiveness.
Innovation Solution
A motor vehicle unit electric motor with a conductive shielding housing and a modular end plate that combines mechanical protection and interference suppression, featuring a pot-shaped protective housing and integrated interference suppression elements close to the commutator for enhanced electromagnetic shielding and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If external interference suppression components are arranged outside the protective housing, then interference suppression is achieved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the interference suppression function with the existing end plate structure by integrating suppression components into the end plate's circuit board. This merging approach eliminates the need for separate external suppression components while maintaining effective electromagnetic interference suppression, thereby reducing device complexity and space requirements.
Solution Approach 2:
The end plate is designed to serve multiple functions: mechanical support, electrical connection, and interference suppression. By making the end plate multi-functional through integrating suppression components into its circuit board, the patent eliminates the need for separate suppression devices, reducing overall device complexity while achieving effective interference suppression.
2Object-generated harmful factors
If interference suppression components are integrated on the commutator circuit board, then compact design is achieved, but adaptability of interference suppression is limited
Solution Approach 1:
The patent segments the interference suppression function into a separate, interchangeable module that can be mounted on the end plate's circuit board. This modular design allows different suppression components or configurations to be easily swapped or adapted without redesigning the entire motor structure, thereby maintaining compact integration while significantly improving adaptability to different interference scenarios.
Solution Approach 2:
The patent enables dynamic adaptability of interference suppression by allowing the suppression components on the end plate circuit board to be easily modified, replaced, or reconfigured. This dynamic approach permits the suppression system to be adapted to different electromagnetic interference conditions without requiring changes to other motor components, balancing compact design with versatility.
3Adaptability or versatility
If modular end plate design with integrated suppression is used, then adaptability of interference suppression is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the interference suppression function into a separate, standardized module that mounts on the end plate circuit board. This segmentation allows the suppression module to be manufactured independently using standard PCB techniques, and then assembled into the motor. This approach improves adaptability while keeping manufacturing complexity manageable through modular, standardized production.
Solution Approach 2:
The end plate is designed as a universal platform that combines mechanical support, electrical connection, and interference suppression functions. By integrating suppression components into the existing end plate circuit board structure rather than creating entirely separate assemblies, the patent achieves multi-functionality while minimizing increases in manufacturing complexity, as the circuit board serves multiple purposes.
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 provides effective electromagnetic interference suppression, protecting against moisture and ensuring reliable operation in harsh environments while allowing for easy adaptation of interference suppression without altering other motor components.
Implementation Method 1
The preferably cylindrical shielding housing 14 made of electrically conductive material is essentially used for electromagnetic shielding of the electrical motor parts
Implementation Method 2
an electrical interference suppression element 70, 72 which is connected to the two contact elements, i.e. to the motor ground contact element and the motor phase contact element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an automotive electric motor (10) with an electrically conductive shielding housing (14) comprising a motor stator, a motor rotor, and a mechanical commutator, and with a cup-shaped and splash-proof protective housing (12) into which the shielding housing (14) is inserted. The protective housing (12) has a mounting opening (30) at one axial end for inserting the shielding housing (14).A cover plate (16) is inserted into the mounting opening (30), the cover plate (16) having a central shaft opening (34) through which a motor output shaft (26) passes, a retaining recess (34) through which an axial fixing protrusion (22) of the shielding housing (14) projects to support it in the protective housing (12), a motor ground contact element (38) that is electrically connected to the shielding housing (14), a motor phase contact element (52, 53) that is electrically connected to a motor phase, and an electrical interference suppression element (70, 72) that is connected to the contact elements (52, 53).