Rotational Angle Sensor Shielding and Alignment
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Solution Overview
Problem
Magnet-based rotational angle measuring systems on drive shafts face inaccuracies due to external magnetic disturbances and alignment challenges, leading to complex and costly manufacturing and assembly processes.
Innovation Solution
A magnet-based rotational angle measuring system arrangement that includes a shielding body between the sensor unit and the drive motor housing part, along with an alignment element for direct alignment of the sensor unit with the drive motor housing part, which reduces magnetic interference and simplifies the alignment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnet-based rotational angle measuring system is installed on a drive shaft, then rotary movement detection is achieved, but magnetic disturbances from the drive shaft and housing cause measuring errors
Solution Approach 1:
A shielding body is introduced as an intermediary component between the drive motor housing part and the sensor unit. This shielding body blocks magnetic disturbance fields from reaching the sensor unit, thereby protecting the measurement system while allowing the exciter unit to generate the necessary rotational magnetic field for measurement
2Measurement precision
If individual components are manually assembled and aligned with high precision, then measurement accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The alignment element merges multiple functions into a single component: it provides precise alignment between the sensor unit and drive motor housing part, and simultaneously serves as a mounting structure. This integration eliminates the need for separate alignment procedures and reduces assembly steps while maintaining concentricity within 0.01 mm
Solution Approach 2:
The alignment element is pre-designed with specific geometric features (such as centered bore or mounting holes) that automatically establish the correct positional relationship between components during assembly. This preliminary design of alignment features eliminates the need for manual adjustment and ensures consistent alignment accuracy
3Measurement precision
If a shielding body is added to block magnetic disturbances, then measurement accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The alignment element is designed to perform multiple functions simultaneously: it provides precise alignment between components, serves as a mounting structure for the sensor unit, and in some embodiments contributes to magnetic shielding. This multi-functionality reduces the need for separate components and simplifies the overall system structure
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 arrangement enhances measuring accuracy by shielding the system from magnetic disturbances and simplifies the alignment and assembly process, reducing manufacturing costs and tolerances.
Implementation Method 1
a shielding body arranged between the stationary sensor unit and the drive motor housing part
Implementation Method 2
an exciter unit connected to the drive shaft at the free end thereof for conjoint rotation, and a stationary sensor unit which co-operates functionally with the exciter unit in order to detect a rotary movement of the drive shaft
Implementation Method 3
The sensor unit comprises a sensor carrier and at least one detection sensor arranged on the sensor carrier, for example, a Hall sensor
Data Source
AI summary
An arrangement of a magnet-based rotational angle measuring system on a drive motor housing part. The arrangement includes the drive motor housing part, a drive shaft with a free end which extends out of the drive motor housing part, an exciter unit connected to the free end of the drive shaft to rotate therewith, a stationary sensor unit which cooperates with the exciter unit to detect a rotary movement of the drive shaft, a shielding body arranged between the stationary sensor unit and the drive motor housing part, and an alignment element which directly aligns the stationary sensor unit with respect to the drive motor housing part.