Rolling Bearing Sensor EFT Protection via Cable Filter
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Solution Overview
Problem
Existing rolling bearing assemblies face challenges in protecting electronic components from electromagnetic fast transient phenomena (EFT) due to bulky filters that increase the overall size, making them unsuitable for compact applications, and existing EMI filters are not effective against EFT.
Innovation Solution
A compact rolling bearing assembly with a filter for transient voltage oscillations mounted on the electric cable between the sensing means and the electronic circuit, which efficiently protects the components without increasing the size of the bearing, using an RC circuit with specific resistance and capacitance values, and optionally including ferrite beads and Zener diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electronic filter is incorporated next to the sensor or electronic components to protect against EFT, then the protection effectiveness is improved, but the overall volume of the rolling bearing assembly increases substantially
Solution Approach 1:
The filter is segmented from the bearing assembly and placed on the cable instead. This separates the protection function from the mechanical support function, allowing the bearing assembly to remain compact while the filter provides EFT protection on the electrical connection path.
Solution Approach 2:
The filter acts as an intermediary element placed on the cable between the sensor and external electronic circuits. It mediates the electrical connection while providing protection, without requiring integration into the bearing assembly structure itself.
2Volume of stationary object
If the electronic filter is reduced in size to fit small diameter rolling bearing assemblies, then the volume is reduced, but the protection effectiveness against EFT is compromised
Solution Approach 1:
By segmenting the filter from the bearing assembly and placing it on the cable, the filter can be sized appropriately for EFT protection without being constrained by the bearing assembly diameter. The filter size is determined by electrical protection requirements rather than mechanical space constraints.
3Object-affected harmful factors
If an EMI filter is used to eliminate high-frequency noise, then the noise filtering is improved, but the overall volume of the bearing assembly increases and it is not adapted to EFT
Solution Approach 1:
The filter is positioned as an intermediary on the cable rather than integrated into the bearing assembly. This allows use of EFT-appropriate filtering components without increasing bearing assembly volume, while still providing protection against both EFT and high-frequency noise.
Solution Approach 2:
The filter design uses specific parameter values (resistance and capacitance) optimized for EFT protection rather than conventional EMI filtering. This changes the filtering characteristics to be effective against EFT transients while maintaining compact dimensions.
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 protects the sensing means from EFT-induced transient voltage oscillations, preventing damage while maintaining a compact design, allowing for the use of standard connectors and accommodating various electronic environments without mechanical interference.
Implementation Method 1
protect the electronic components of the sensing means, such as the sensor, against electromagnetic fast transient phenomenons or 'EFT'
Implementation Method 2
a filter for transient voltage oscillations due to electromagnetic fast transient phenomenons is mounted on the cable
Implementation Method 3
using an RC circuit with specific resistance and capacitance values
Implementation Method 4
using an RC circuit with specific resistance and capacitance values
Implementation Method 5
optionally including ferrite beads
Implementation Method 6
optionally including ferrite beads and Zener diodes
Data Source
AI summary
This rolling bearing assembly (2) comprises a rolling bearing (4) with an inner ring (8), an outer ring (6) and several rolling bodies (10) between the inner and outer rings, at least one sensor (30) adapted to detect a rotation parameter of a first ring (8) with respect to a second ring (6) of the rolling bearing and a support member (40) holding the sensor (30) in position with respect to the rolling bearing (4). The support member (40) holds the sensor (30) in a position such that at least one connecting pin (34, 36, 38) of the sensor (30) extends in a volume (46) defined by the support member (40) and adapted to accommodate an electrical connector (100).