Resolver Housing Structure for Magnetic Crosstalk Shielding
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Solution Overview
Problem
Existing resolvers face challenges in achieving high measuring accuracy and efficient manufacturing, particularly due to magnetic interferences between resolver windings and transformer windings.
Innovation Solution
The resolver design incorporates two rotatable units with housing and hub components made of different materials (amagnetic and magnetic) and coupled in a torsion-proof manner, which shields the resolver windings from the transformer windings' magnetic field, reducing crosstalk and enhancing manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resolver windings and transformer windings are arranged in the same housing, then device complexity is reduced, but magnetic interference between windings increases
Solution Approach 1:
The housing is divided into a first housing component and a second housing component, with resolver windings arranged in the first component and transformer windings in the second component. This segmentation spatially separates the two winding types while maintaining a unified housing structure, thereby reducing magnetic interference without significantly increasing device complexity.
Solution Approach 2:
A shielding structure is introduced as an intermediary element between the resolver windings and transformer windings. This shielding structure acts as a magnetic field barrier that blocks or redirects magnetic flux, preventing harmful magnetic coupling between the two winding types while allowing both to coexist in the same housing.
2Measurement precision
If additional shielding structure is added to minimize magnetic interference, then measuring accuracy improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The shielding structure is merged with the housing components themselves rather than being a separate additional element. The first and second housing components are designed to inherently provide magnetic shielding through their material properties and geometric arrangement, eliminating the need for separate shielding structures and reducing overall device complexity.
3Ease of manufacture
If housing components are made from identical material, then manufacturing simplicity is maintained, but magnetic interference between windings increases
Solution Approach 1:
Different material properties are assigned to different housing components based on their local functional requirements. The first housing component (containing resolver windings) and the second housing component (containing transformer windings) are made from materials with different magnetic permeabilities, creating local quality differences that optimize magnetic field distribution and reduce interference while maintaining manufacturing feasibility.
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 improves measuring accuracy by minimizing magnetic interference and allows for simplified, high-volume manufacturing of resolvers with reduced production complexity.
Implementation Method 1
the first material is an amagnetic raw material, and the second material is a magnetic raw material... the coupling between the first and second housing component is formed in a torsion-proof manner or for conjoint rotation
Implementation Method 2
a resolver is an electromagnetic transducer for converting the angular position of a rotor into an electrical variable or electrical signals
Data Source
AI summary
A resolver includes two units that are rotatable relative to one another about an axis. The resolver is adapted to determine the relative angular position between the two units. At least one of the two units includes a plurality of resolver windings and transformer windings. A first unit includes a first housing component and a second housing component, and a second unit includes a first hub component and a second hub component. The first and second housing components are coupled to one another at at least one connection point that extends in the circumferential direction. Additionally or alternatively, the first and second hub components are also coupled at at least one further connection point that extends in the circumferential direction.