Magnetorheological Haptic Brake with Dual-Coil Torque Control
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Solution Overview
Problem
Existing magnetorheological brakes have a relatively high basic friction in relation to maximum torque, limiting their working range, which is insufficient for fine motor applications requiring lower basic torque with higher maximum torque and consistent performance across varying speeds.
Innovation Solution
A haptic operating device with a magnetorheological braking system featuring two separate electrical coils and differently designed braking gap sections, allowing independent control for low and high torques, and a magnetically conductive core and casing, enabling low basic torque and high maximum torque across different speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetic field system is used, then the device complexity is low, but the control range and adaptability are limited
Solution Approach 1:
The single magnetic field system is segmented into multiple independent magnetic circuit regions, each with its own electrical coil and brake gap section. This segmentation increases control versatility without significantly increasing overall system complexity, as the segmented regions share common structural elements like the magnetorheological fluid reservoir and basic mechanical components.
Solution Approach 2:
The third brake gap section serves multiple functions: it provides continuous basic friction control, acts as a magnetic circuit closure path, and can be combined with the first and second sections to achieve different torque levels. This multi-functionality increases adaptability while minimizing additional 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 device achieves a consistent maximum torque across varying speeds with low basic friction, providing sensitive haptic feedback and redundancy for reliable operation, suitable for fine motor applications.
Implementation Method 1
If such a magnetorheological fluid is subjected to a magnetic field, the carbonyl iron particles of the magnetorheological fluid or the magnetorheological medium or the magnetorheological fluid link up along the magnetic field lines, so that the rheological properties of the magnetorheological medium are significantly influenced depending on the shape and strength of the magnetic field (transmissible shear stresses).
Implementation Method 2
A first electric coil is assigned to the first brake gap section and a separately controllable second electric coil is assigned to the second brake gap section
Data Source
AI summary
A haptic operating device having a magnetorheological braking device, a stationary holder, and two brake components. One of the brake components is connected to the holder for fixed rotation therewith. The brake components can be continuously rotated relative to one another about a rotation axis. A first brake component extends along the rotation axis and has a magnetically conductive core. The second brake component has a hollow casing part extending around the first brake component. Axially spaced apart peripheral braking gap portions formed between the first and second brake components are at least partially filled with a magnetorheological medium. At least one third braking gap portion is located axially between a first and a second braking gap portion. A first electric coil is assigned to the first braking gap portion and a separately controllable second electric coil is assigned to the second braking gap portion.