Motor Brush Holder Integrated Capacitor Grounding
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Solution Overview
Problem
Existing motor designs fail to efficiently suppress electromagnetic noise generated by slide contacts of brushes on commutators, as the grounding of capacitors is limited to small components, such as the yoke housing, which is not effectively connected to the vehicle body, leading to inadequate noise suppression.
Innovation Solution
A brush holder with an integrated capacitor and grounding terminal, where the capacitor is connected between the power supply terminal and the grounding terminal, and the grounding terminal is securely connected to the vehicle body, enhancing the electromagnetic noise suppression by providing a larger grounding path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capacitor is connected only to the yoke housing for grounding, then the structure is simple, but the electromagnetic noise suppression is insufficient
Solution Approach 1:
The grounding structure is segmented into multiple independent grounding terminals (first grounding terminal connected to yoke housing, second grounding terminal connected to brush holder) rather than relying on a single grounding point. This segmentation provides multiple grounding paths for the capacitor, improving electromagnetic noise suppression while maintaining structural simplicity through modular design.
Solution Approach 2:
The brush holder serves as an intermediary component that provides an additional grounding path. By embedding a grounding terminal in the brush holder and connecting it to the capacitor, the system creates an intermediate grounding route that enhances noise suppression without requiring direct connection to the vehicle body, thus avoiding increased complexity.
2Reliability
If the grounding terminal is embedded in the brush holder, then the grounding path is improved, but the brush holder structure becomes more complex
Solution Approach 1:
The grounding terminal is merged with the brush holder by being embedded within it, creating an integrated structure. This combining approach improves grounding connection reliability by providing a dedicated grounding path through the brush holder while avoiding the complexity of separate grounding components and connections.
Solution Approach 2:
The brush holder is given multiple functions: it not only holds the brush for electrical contact with the commutator but also serves as a grounding terminal support. This multi-functionality improves grounding reliability without adding separate grounding structures, thereby avoiding increased complexity.
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 electromagnetic noise by ensuring the capacitor is grounded to the vehicle body, improving the electromagnetic shielding effect and reducing noise radiation, while maintaining a secure seal and efficient operation of the motor.
Implementation Method 1
the capacitor is installed on the holder body portion to connect a point on a power supply terminal between the connector portion and the brush to the grounding terminal
Data Source
AI summary
A brush holder of a motor is provided with a holder body portion and a connector portion, which are integrally formed from a resin. The holder body portion is installed in a yoke housing of the motor to hold a brush to be in slide contact with a commutator. The connector portion is connected with an external connector to energize an armature. A grounding terminal is embedded in brush holder to extend from the holder body portion to the connector portion to be connected to a grounding line of the external connector. A capacitor is installed on the holder body portion to connect a point on a power supply terminal between the connector portion and the brush to the grounding terminal.