Magnetorheological Brake Shielding Ring for Coil Field Isolation
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Solution Overview
Problem
Existing magnetorheological braking devices face challenges in effectively shielding sensors from magnetic interference, particularly in compact designs with limited installation space, leading to precision issues and increased complexity.
Innovation Solution
The introduction of a magnetorheological braking device with a shielding apparatus that includes a shielding member surrounding the magnetic ring unit and a separation unit with reduced magnetic conductivity, along with a mounting apparatus for secure integration, effectively shields sensors from magnetic interference while optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor apparatus is installed in a magnetorheological braking device with limited space, then the device can detect rotary position, but the sensor is exposed to magnetic field interference from the coil unit
Solution Approach 1:
A shielding member made of magnetically conductive material is introduced as an intermediary between the coil unit and the sensor apparatus. This shielding member redirects magnetic field lines around the sensor, preventing direct magnetic field interference while allowing the sensor to continue detecting rotary position accurately in the limited space available
2Reliability
If shielding components are added to protect the sensor from magnetic interference, then measurement reliability improves, but the already limited installation space is further reduced
Solution Approach 1:
The shielding member is designed to serve multiple functions simultaneously: it provides magnetic field shielding for the sensor, acts as a structural support component, and can be integrated with existing device housing elements. This multi-functionality allows reliable sensor operation without proportionally increasing the overall device volume
Solution Approach 2:
The shielding member is positioned and configured to nest within the existing structural boundaries of the braking device, utilizing available space efficiently. The shielding structure is integrated into the existing assembly rather than adding external bulk, allowing compact arrangement of all components within the limited installation space
3Measurement precision
If the spacing between the magnetic ring and sensor is reduced to improve detection precision, then measurement accuracy increases, but the sensor becomes more vulnerable to magnetic interference
Solution Approach 1:
The shielding member is strategically positioned between the coil unit's magnetic field and the sensor apparatus, creating a magnetic field barrier that allows the magnetic ring to be placed closer to the sensor for improved detection precision while the shielding member absorbs and redirects stray magnetic field lines away from the sensor
4Manufacturing precision
If multiple components are assembled to achieve precise sensor positioning, then detection accuracy improves, but the assembly complexity increases
Solution Approach 1:
The shielding member is designed to be integrally formed with or directly attached to existing structural components of the braking device, such as the housing or mounting brackets. This merging of functions reduces the total number of separate parts and simplifies the assembly process while maintaining precise sensor positioning and effective magnetic shielding
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 configuration enhances the precision and reliability of sensor detection, reduces installation space requirements, and simplifies the assembly process, addressing the challenges of magnetic interference and compact design in magnetorheological braking devices.
Implementation Method 1
at least one shielding member which at least in portions surrounds the magnetic ring unit and which serves to at least partially shield the sensor apparatus at least from a magnetic field of a coil unit of the braking apparatus and/or in particular from external magnetic fields
Implementation Method 2
A rotatability of the rotating member is able to be braked in a targeted manner by means of at least one magnetorheological braking device
Implementation Method 3
The sensor apparatus comprises at least one magnetic ring unit and at least one magnetic field sensor for detecting a magnetic field of the magnetic ring unit
Data Source
AI summary
A magnetorheological braking device for setting operating states by way of rotational movements has an axle unit and a rotary body rotatable about the axle unit. The rotatability of the rotary body can be decelerated and/or blocked by a magnetorheological braking apparatus. A sensor apparatus has a magnetic ring unit and a magnetic field sensor for sensing a magnetic field of the magnetic ring unit. A shielding apparatus at least partially shields the sensor apparatus from a magnetic field of a coil unit of the braking apparatus. The shielding apparatus includes a shielding body surrounding the magnetic ring unit and a separating unit between the shielding body and the magnetic ring unit, and having a magnetic conductivity multiple times lower than the shielding body. A holding apparatus connects the shielding apparatus to the rotary body in an at least partially rotationally fixed manner.