Variable Reluctance Resolver Coil Layout for Any-Speed Position Sensing
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Solution Overview
Problem
Existing VR resolvers face challenges in achieving accurate 1× speed operation due to lack of unified theoretical design principles, resulting in sub-optimal performance and reliance on ad-hoc designs, especially in harsh environments.
Innovation Solution
The integration of the ZF transform function into the coil-windings of the multi-phase VR resolver body allows for the design of a novel VR resolver that supports any speed, even or odd-numbered, without increasing complexity, by determining the coil-winding turns and polarities based on synthesis coefficients of the N-phase ZF transform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ad-hoc or heuristic design approaches are used for VR resolvers, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying the coil-winding configurations (number of turns, winding directions, connection patterns) and rotor pole geometries to optimize the magnetic flux distribution. This enables achievement of high measurement precision through parameter optimization rather than complex structural design, resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The patent replaces complex mechanical design approaches with electromagnetic field-based solutions. Instead of using mechanically complex multi-rotor systems or precision-machined components, the invention uses optimized electromagnetic flux patterns generated by specifically configured coil windings and rotor poles to achieve high-position sensing accuracy, thereby reducing mechanical complexity while improving precision.
2Device complexity
If 1× speed VR resolver is designed without unified theoretical principle, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent develops a unified theoretical framework that serves multiple functions: it guides coil-winding configuration, determines rotor pole design, optimizes magnetic flux distribution, and ensures accurate angular measurement. This single comprehensive theory replaces multiple ad-hoc design approaches, achieving high measurement precision without increasing device complexity by providing a universal design methodology applicable to 1× speed VR resolvers.
3Ease of manufacture
If even-numbered speed VR resolvers are used, then ease of manufacture is improved, but adaptability deteriorates
Solution Approach 1:
The patent enables flexible speed configurations (including odd-numbered speeds) by changing the parameters of coil-winding arrangements and rotor pole counts while maintaining the same basic resolver structure. This allows manufacturers to produce resolvers with different speed ratios (1×, 2×, 3×, 4×, etc.) using the same manufacturing processes and assembly methods, thereby achieving both ease of manufacture and adaptability through parameter variation rather than structural redesign.
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 approach enables the creation of VR resolvers with improved position-sensing accuracy and reduced complexity, capable of operating at any speed, thus overcoming the limitations of existing VR resolvers.
Implementation Method 1
Variable reluctance resolver
Data Source
AI summary
Variable reluctance (VR) resolvers applicable to even or odd speed are provided. In an N-phase VR resolver, 2N coil-poles are evenly distributed around the stator, N being odd integer greater than or equal to three. Primary coils are wound with the same number of turns, but their winding polarities alternate across the coil-poles. The number of turns and winding polarities for sine and cosine signal sensing coils are determined by sine and cosine synthesis coefficients of N-phase zero-force transform. The coil turns ratios between sine and cosine signal sensing coils relative to the primary coil are dictated by absolute values of the coefficients, while the winding polarities are determined by signs of the coefficients. In odd-speed VR resolvers, winding polarities of pair of sensing coils symmetrically located 180 degrees apart must be identical, whereas in even-speed VR resolvers, these winding polarities must be opposite.