Stator Fastening in Claw Gaps for Magnetic Shielding
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Solution Overview
Problem
Existing stators are unable to effectively shield against external magnetic interferences due to the arrangement of fastening elements, which obstruct the placement of flux collectors between stator rings, leading to inefficient magnetic field damping and potential short circuits.
Innovation Solution
The stator fastening elements are positioned in the claw gaps on the radial inner side of the stator rings, allowing flux collectors to be placed axially between the rings without interference, and the stator interlocking elements are designed to engage axially with a carrier, enabling efficient mounting and minimizing magnetic short circuits by being radially open and integrated with the stator ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fastening elements are arranged on stator rings as through-bores, then stator rings can be securely mounted on carrier, but flux collectors cannot be arranged axially between stator rings to shield against external magnetic interferences
Solution Approach 1:
The fastening elements are moved from a radial arrangement (through-bores on stator rings) to an axial arrangement (in claw gaps between stator rings). This dimensional change allows flux collectors to be positioned axially between stator rings for magnetic shielding while maintaining secure mounting through the interlocking mechanism between carrier fastening elements and stator fastening elements in the claw gaps.
Solution Approach 2:
The stator is divided into multiple stator rings with claw gaps between them, allowing fastening elements to be positioned in these gaps rather than through the rings themselves. This segmentation enables the flux collectors to be placed axially between the rings, creating shielded zones while maintaining structural integrity through the interlocking claw mechanism.
2Ease of manufacture
If flux collectors are arranged circumferentially on radial outside of stators, then mounting is simplified, but external magnetic fields can reach flux collectors unimpeded causing interfering magnetic fields
Solution Approach 1:
Flux collectors are repositioned from a circumferential arrangement on the radial outside to an axial arrangement between stator rings. This dimensional change places the flux collectors within the magnetic circuit where they can effectively guide and shield magnetic flux, blocking external magnetic interferences while maintaining manufacturing simplicity through the integrated claw gap design.
3Object-affected harmful factors
If stator rings are used as electromagnetic shields with flux collectors arranged axially between them, then external magnetic interferences can be dampened, but fastening elements will interfere with the stator and cause magnetic short circuits
Solution Approach 1:
The fastening elements are designed with specific local properties: they are positioned in claw gaps and have a radial open structure that allows magnetic flux to pass through without short-circuiting. This local quality differentiation enables the fastening elements to fulfill their mechanical function while avoiding interference with the magnetic circuit, allowing axial flux collector arrangement for effective magnetic shielding.
Solution Approach 2:
The fastening function is extracted from the radial plane (where it would interfere with magnetic flux) and placed in the claw gaps where it can operate independently. The radial open design of fastening elements further extracts any potential magnetic interference, allowing the stator rings to function as effective electromagnetic shields with axial flux collectors.
4Ease of operation
If fastening elements protrude radially above claws, then mounting on carrier is simplified, but magnetic short circuits occur between excitation magnet and stator
Solution Approach 1:
Fastening elements are designed with a radial open structure that differentiates their magnetic properties from solid radial protrusions. This local quality allows them to engage axially with carrier fastening elements for simplified mounting while maintaining magnetic flux pathways through their open design, preventing short circuits between the excitation magnet and stator.
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 allows for effective damping of external magnetic interferences and prevents undesirable magnetic short circuits, ensuring accurate magnetic field transmission to sensors while maintaining structural integrity and ease of assembly.
Implementation Method 1
external magnetic interferences could at least be dampened
Implementation Method 2
no magnetic conducting material in an excitation magnet of the sensor may interfere with the stator and cause undesirable magnetic short circuits
Implementation Method 3
a magnetic transducer which can be connected stationarily with the second shaft, and which is arranged co-axially to the rotation axis to generate and feed the magnetic field in the stator
Implementation Method 4
a magnetic field sensor for recording a magnetic field from the magnetic transducer passing the stator
Data Source
AI summary
A stator to guide a location-dependent magnetic field around a rotation axis including a first stator ring and a second stator ring arranged concentrically to the first stator ring. First claws project axially from the first stator ring in the direction of the second stator ring and are arranged circumferentially around a rotation axis and at a distance with the first claw gaps engaging in second claw gaps between second claws which are arranged circumferentially around the rotation axis, and protrude axially in the direction of the first stator ring at a distance to the second claw gaps. Each of the first and second claws includes a claw head. In at least one of the first claw gaps and in one of the second claw gaps relative to the corresponding claw head, a stator fastening element is arranged to fasten the first and second stator rings.