Concentric Magnetic Track Torque Test Body
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Solution Overview
Problem
Existing torque determination systems face precision issues due to magnetic and mechanical eccentricities in the magnetic tracks, leading to errors in determining reduced twist angles between rotating members.
Innovation Solution
A test body with concentrically magnetized magnetic tracks on two rings, which allows for precise torque determination by eliminating eccentricity-induced errors through a common axis of revolution, and a method for producing such a test body by fixing and magnetizing the rings to ensure concentricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic tracks are used on rotating rings for torque determination, then angular displacement can be measured, but eccentricity defects cause errors in torque determination precision
Solution Approach 1:
A non-magnetic intermediate ring is introduced between the magnetic track ring and the rotating ring. This intermediary component allows the magnetic track to be mounted on a separate ring that can be precisely centered, while still transmitting rotational movement to measure angular displacement. The intermediate ring decouples the magnetic track positioning from the rotating ring, enabling accurate torque measurement despite potential eccentricities in the rotating ring itself.
2Ease of operation
If magnetic tracks are mounted on rotating rings, then rotational displacement signals can be generated, but mechanical eccentricity causes signal comparison errors
Solution Approach 1:
The non-magnetic intermediate ring serves as a mediator that separates the signal generation function from the rotational movement. The magnetic track on the intermediate ring can be precisely positioned relative to the sensor, while the intermediate ring itself is mounted on the rotating ring through a deformable structure that allows angular displacement. This arrangement ensures that mechanical eccentricity of the rotating ring does not affect the precision of angular position determination.
3Measurement precision
If concentric magnetization is implemented, then eccentricity errors are eliminated, but manufacturing complexity increases
Solution Approach 1:
The intermediate ring simplifies the manufacturing process by providing a separate mounting surface for the magnetic track that can be independently centered. Instead of requiring precise concentric magnetization on the rotating ring itself, the magnetic track is mounted on the intermediate ring which can be positioned concentrically with the sensor. This decoupling reduces manufacturing complexity while achieving the same precision benefits.
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 concentric magnetization of magnetic tracks on the test body's rings ensures accurate torque measurement by eliminating positional errors, enhancing precision in determining the angle of twist between rotating members.
Implementation Method 1
a magnetic track which is capable of emitting a signal representative of the displacement of said ring in rotation
Data Source
Figure 1~1a
Figure 2~3
Figure 3a~4
AI summary
The invention relates to a test body for a system for determining a torque applied between two rotating members, said test body having an inner ring (1) and an outer ring (2) connected by a deformable structure which is arranged to transmit the torque between the members while allowing an angular deflection between said rings as a function of the applied torque, said test body being equipped with two rings (5, 6) each carrying a magnetic track (7, 8) which is capable of emitting a signal representative of the displacement of said ring in rotation, the rings (5, 6) being fixed on respectively a ring (1, 2) and the magnetic tracks (7, 8) being magnetized concentrically so that they have a common axis of revolution (P) so as to form respectively an inner magnetic track (7) and an outer magnetic track (8) of an encoder.