Resolver Stator Core with Segmented Holes for Leakage Flux Control
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Solution Overview
Problem
Conventional resolvers experience variations in noise component effects on output windings due to leakage fluxes, leading to reduced angle detection accuracy, as the effect of leakage fluxes on windings varies depending on the position of protruding magnetic poles.
Innovation Solution
A stator structure with a ring-shaped main body and teeth, featuring elongated holes and additional holes arranged between teeth and beams, which reduces the variation in flux effects on windings by controlling the flow of leakage fluxes, thereby minimizing the impact on angle detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If arc-shaped openings are formed in the stator core to reduce leakage flux effects, then the overall magnetic shielding is improved, but leakage fluxes still enter through beams between openings causing position-dependent noise variations
Solution Approach 1:
The stator core is segmented into multiple regions by forming both arc-shaped openings and additional radial holes. The arc-shaped openings provide overall magnetic shielding while the radial holes segment the beams between openings, creating multiple smaller shielding zones that collectively reduce position-dependent noise variations across different tooth positions.
Solution Approach 2:
Different regions of the stator core are given different shielding characteristics. The arc-shaped openings provide broad circumferential shielding, while additional radial holes are strategically placed at specific locations (such as midway between adjacent arc-shaped openings) to provide localized shielding enhancement at critical positions where leakage flux effects are most problematic.
2Measurement precision
If multiple types of holes are formed in the stator core to reduce noise variation, then the structural complexity increases
Solution Approach 1:
The complex shielding requirement is segmented into two simpler components: arc-shaped openings for overall shielding and radial holes for localized enhancement. This segmentation makes the design more manageable and manufacturable compared to attempting to create a single complex shielding structure.
Solution Approach 2:
Instead of providing continuous complex shielding throughout the entire stator core, radial holes are placed at selective critical positions (such as midway between arc-shaped openings). This partial action approach provides sufficient noise reduction at key locations without the excessive complexity of complete continuous shielding.
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 proposed stator structure effectively minimizes the range of variation in flux effects on windings, preventing a decrease in angle detection accuracy caused by leakage fluxes entering from the outer circumferential side to the inner side.
Implementation Method 1
the arc-shaped openings make the outer edge of the stator core have high magnetic reluctance, and leakage fluxes are thus made difficult to reach inside the stator core
Data Source
AI summary
A stator structure of an embodiment includes a stator core that comprises: a ring-shaped main body; and a plurality of teeth extending in a radial direction of the main body and arranged along a circumferential direction of the main body. The main body comprises a plurality of elongated holes that are formed in an arc shape along the circumferential direction of the main body and that are arranged along the circumferential direction of the main body, and a plurality of holes that are arranged along the circumferential direction of the main body between the teeth and the elongated holes in the radial direction of the main body. At least one of the holes is disposed between beams and the teeth located close to the beams, the beams being provided between the adjacent elongated holes.