Resolver Stator Structure with Dual-Sided Magnetic Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional resolver stator structures face reduced angle detection accuracy due to external magnetic flux interference, as the electromagnetic shield does not effectively prevent magnetic noise from entering the stator from the opposite surface, leading to inaccurate rotation position detection in rotating electrical machines.
Innovation Solution
A stator structure comprising a stator core with radially extending teeth, insulators, and shield plates attached on both sides of the stator core with coil covers in between, which prevents external magnetic flux from entering the stator by covering it from both axial directions and maintaining the shield plates non-contact with the stator core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electromagnetic shield covers the teeth on one surface side of the stator, then magnetic noise from that side is reduced, but magnetic flux from the outside can enter the stator from the other surface side, reducing angle detection accuracy
Solution Approach 1:
The electromagnetic shield is divided into two separate shield plates that are positioned on opposite sides of the stator core, with the coil cover interposed between them. This segmentation allows each shield plate to effectively block magnetic flux from its respective side, preventing magnetic noise from entering the stator from either direction while maintaining angle detection accuracy.
Solution Approach 2:
The shielding approach transitions from single-sided coverage to dual-sided coverage by adding a second shield plate on the opposite side of the stator core. This dimensional expansion in the axial direction ensures comprehensive magnetic flux blocking from both sides, eliminating the vulnerability of single-sided shielding.
2Object-affected harmful factors
If the electromagnetic shield covers the teeth, then magnetic shielding is provided, but the stator core and electromagnetic shield are in contact, allowing magnetic flux to enter through the shield
Solution Approach 1:
The coil cover is introduced as an intermediary component positioned between the stator core and the shield plates. This intermediate layer electrically isolates the shield plates from the stator core, preventing magnetic flux from passing through contact points while maintaining the magnetic shielding effect. The coil cover acts as a non-magnetic barrier that preserves shielding effectiveness.
Solution Approach 2:
The coil cover is strategically positioned only where the shield plates would otherwise contact the stator core, providing localized electrical isolation at critical contact points. This local application of the intermediary principle maintains shielding effectiveness without requiring complete separation of all components.
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 significantly enhances the angle detection accuracy by blocking external magnetic fluxes, preventing them from entering the stator and reducing interference, thus ensuring precise rotation position detection in rotating electrical machines.
Implementation Method 1
the shield plates are attached to the stator core from both sides in the axial direction of the stator core with the respective coil covers interposed therebetween
Data Source
AI summary
A stator structure includes a stator core, insulators, a coil, and shield plates. The stator core includes a plurality of teeth extending from a body part of the stator core in a radial direction thereof. The body part is formed in an annular shape. The insulators cover the teeth from both sides in an axial direction of the stator core. The coil is wound around each of the teeth with the insulators interposed therebetween. The coil covers cover the coil from both sides in the axial direction. Each of the coil covers is formed in an annular shape. The shield plates are attached to the stator core from both sides in the axial direction of the stator core with the respective coil covers interposed therebetween.