Stator Mounting for Torque Sensors
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Solution Overview
Problem
The existing stator design for guiding a location-dependent magnetic field in a circumferential direction around an axis of rotation lacks effective shielding against external magnetic interference, as fastening elements obstruct the arrangement of flux collectors between stator rings, leading to electromagnetic interference issues.
Innovation Solution
The stator incorporates a stator positive-locking element in the form of a fork directed radially toward the axis of rotation, allowing for axial engagement with a carrier and placement without interfering with the magnetic field, and is designed to be produced efficiently as a single piece with the stator ring, with fastening elements arranged in radial recesses between claws to minimize installation space and prevent magnetic short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fastening elements are arranged in through bores on the stator ring, then the stator can be assembled, but flux collectors cannot be arranged in this area and external magnetic interference cannot be shielded
Solution Approach 1:
The fastening elements are moved from the radial dimension (through bores on the stator ring) to the axial dimension (between the stator rings). This dimensional shift allows flux collectors to be positioned in the radial space between stator rings, enabling both fastening functionality and magnetic shielding without spatial conflict.
Solution Approach 2:
The fastening elements are nested within the claw gaps of the stator structure, specifically positioned in the radial recesses between adjacent claws. This nesting approach integrates the fastening function into the existing stator geometry without requiring additional radial space that would interfere with flux collector placement.
2Object-affected harmful factors
If fastening elements are arranged in claw gaps on the radial inside of stator rings, then flux collectors can be arranged axially between stator rings, but the fastening elements may interfere with the stator structure
Solution Approach 1:
The fastening elements are positioned specifically in the radial recesses between adjacent claws, utilizing the existing geometric features of the stator structure. This localized placement ensures that fastening elements do not interfere with the magnetic field path or the overall stator functionality while still providing effective attachment.
Solution Approach 2:
The radial recesses between claws serve as intermediary spaces that accommodate the fastening elements. These recesses act as mediating structures that allow the fastening elements to be integrated into the stator without creating magnetic short circuits or interfering with the magnetic field guidance function.
3Productivity
If the fork is designed in one piece with the stator ring, then production is simplified, but the fastening element must be precisely formed during manufacturing
Solution Approach 1:
The fork-shaped fastening element is merged with the stator ring to form a single integrated component. This combining of functions eliminates the need for separate fastening elements and reduces assembly steps, while the precision requirements are met through integrated manufacturing processes such as stamping and bending.
Solution Approach 2:
The stator ring is transformed from a simple flat structure into a three-dimensional form with axially bent claws and integrated fork-shaped fastening elements. This parameter change in the manufacturing process allows the fastening elements to be formed with the required precision as part of the stamping and bending operations.
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 design effectively shields against external magnetic interference by allowing flux collectors to be placed axially between stator rings, reducing electromagnetic interference and enabling efficient assembly and production while maintaining mechanical strength and stability.
Implementation Method 1
a stator for guiding a location-dependent magnetic field in a circumferential direction about an axis of rotation
Implementation Method 2
a stator positive-locking element which acts in the circumferential direction and into which a carrier positive-locking element arranged axially can engage
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a stator (18) for guiding a position-dependent magnetic field in a circumferential direction around a rotational axis (8), comprising a first stator ring (18') rotating around the rotational axis (8), and a second stator ring (18") rotating around the rotational axis (8), which is arranged concentrically to the first stator ring (18'), wherein the first and second stator rings (18', 18") are arranged accordingly lying in a first axial plane and in a second axial plane spaced apart from the first axial plane and are formed rotating around the rotational axis (8), wherein first claws (40) arranged circumferentially around the rotational axis (8) from the first stator ring (18') and spaced apart from each other by first claw gaps (39) project axially in the direction of the second stator ring (18"), which engage in second claw gaps (42) between second claws (43),which are arranged circumferentially around the axis of rotation (8) of the second stator ring (18") and project axially towards the first stator ring (18') at intervals from each other with the second claw gaps (42), each of the first and second claws (40, 43) comprising a claw head (45) on its side axially opposite the stator ring (18', 18"), and in at least one of the first claw gaps (39) and in one of the second claw gaps (42) opposite the corresponding claw head (45) engaging in the respective first and second claw gap (39, 42) a stator fastening element (44) for fastening the first and second stator rings (18', 18") to a support (29) is arranged.