Brush Holder EMI Suppression via Integrated Circuit Board
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric motors face challenges in suppressing electromagnetic interference (EMI) noise, which affects the performance of sensitive electronic equipment in vehicles, and the use of feed-through capacitors is costly and inefficient, while the axial movement of sensor magnets increases detection errors.
Innovation Solution
A brush holding device with a choke coil connection and electric-magnetic interference suppression components on a circuit board, which is grounded and positioned to minimize parasitic impedances, reducing electromagnetic noise and allowing for compact EMI suppression without the need for feed-through capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If feed-through capacitors are used to guide wires into the electric motor, then electromagnetic noise suppression is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive feed-through capacitors with a cost-effective alternative: a circuit board with integrated EMI suppression components (capacitors and inductors) that are soldered directly to plug contact elements. This approach achieves the same EMI suppression function at a lower cost by using standard electronic components and conventional circuit board technology instead of specialized feed-through capacitors.
Solution Approach 2:
The patent combines multiple functions into a single integrated structure: the circuit board serves as both the electrical connection medium between plug contact elements and brushes, and as the mounting platform for EMI suppression components. This merging of functions eliminates the need for separate feed-through capacitors and reduces overall component count and cost.
2Measurement precision
If the magnetic pole sensor is disposed at the center of the circuit board to reduce detection error width, then measurement precision is improved, but EMI suppression components cannot be disposed together
Solution Approach 1:
The patent resolves the spatial conflict by utilizing the vertical dimension (thickness direction) of the circuit board. The magnetic pole sensor is positioned at the center in the planar view for optimal measurement precision, while EMI suppression components are mounted on the opposite side of the circuit board or in different vertical layers. This dimensional separation allows both requirements to be satisfied simultaneously without increasing wiring length.
3Object-affected harmful factors
If EMI suppression components are disposed separately from the magnetic pole sensor, then EMI suppression is improved, but wiring length increases and electromagnetic noise is easily generated
Solution Approach 1:
The patent merges EMI suppression components with the circuit board structure, positioning them in close proximity to the magnetic pole sensor and signal paths. The circuit board itself becomes the integration platform, with capacitors and inductors soldered directly to appropriate contact areas. This close integration minimizes wiring length and reduces the antenna effect that would otherwise generate electromagnetic noise.
Solution Approach 2:
The circuit board acts as an intermediary structure that physically and electrically connects the EMI suppression components to the signal paths. By using the circuit board's conductive traces and solder joints as connection paths, the patent eliminates long external wiring while providing effective EMI suppression through properly positioned capacitors and inductors.
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 solution effectively reduces electromagnetic noise and detection errors, enhancing EMI suppression performance while avoiding costly components and maintaining compact motor design.
Implementation Method 1
The first plug contact element and the second plug contact element are connected with a brush through a choke coil
Implementation Method 2
the first circuit board has electric-magnetic interference suppression components, wherein the electric-magnetic interference suppression components are electrically connected to the first contact area and the second contact area
Data Source
AI summary
A brush holding device may include a brush holder; a plug; a first plug contact element and a second plug contact element; and a first circuit board. The first plug contact element and the second plug contact element may be connected with a brush through a choke coil. The first circuit board may include electric-magnetic interference suppression components connected to a first and second contact area of the first circuit board. The electric-magnetic interference suppression components may be electrically connected to the first contact area and the second contact area, and the electric-magnetic interference suppression components may be directly or indirectly grounded.