Variable Reluctance Resolver Reducing Wiring Complexity
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Solution Overview
Problem
Existing variable reluctance resolvers in motor control systems require complex wiring and are not adequately redundant, leading to increased assembly complexity and cost, with limited redundancy in detection coil failures.
Innovation Solution
A variable reluctance resolver configuration using two excitation coils and two detection coils, with specific turn settings and frequency differences, reduces wiring complexity and provides redundancy by allowing calculation of rotation angles even with coil failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two redundant resolvers are arranged concentrically on the same axis with separate wiring, then redundancy is secured, but the number of wirings increases to 12 and assembly becomes complex
Solution Approach 1:
The patent merges two separate resolver systems into a single integrated structure where the stators of both resolvers are combined into one stator body with teeth arranged in specific patterns. The excitation coils and detection coils of both resolvers share common magnetic paths and structural support, reducing the total number of separate components and wirings from 12 to 8 while maintaining redundancy through the dual-coil configuration
Solution Approach 2:
The patent creates a multi-functional resolver structure where a single stator serves both resolver systems simultaneously. The first and second excitation coils can operate independently to provide excitation signals at different frequencies, and the detection coils can detect signals from either system, allowing the same physical structure to fulfill multiple functional roles and reduce wiring requirements
2Reliability
If two redundant resolvers are arranged concentrically on the same axis, then redundancy is secured, but assembly complexity and cost increase
Solution Approach 1:
The patent combines two resolver systems into a single integrated stator structure where the teeth and magnetic paths are shared. This merging reduces the number of separate assembly operations required, as the stator is manufactured as one piece rather than two separate components that need to be aligned and assembled concentrically, thereby simplifying the manufacturing process and reducing assembly complexity
Solution Approach 2:
The patent segments the stator teeth into different functional groups (first teeth for first resolver, second teeth for second resolver, and third teeth for mutual interaction) with specific winding patterns. This segmentation allows for standardized manufacturing of coil windings and simplified assembly procedures, as each tooth type can be prepared and assembled in a systematic manner rather than requiring complex custom assembly of two complete resolver systems
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 configuration simplifies assembly, reduces costs, and maintains angular accuracy by reducing the number of wirings from 12 to 8, while ensuring redundancy and robustness against coil failures.
Implementation Method 1
A detection signal of a first frequency is induced in the detection coils 24 and 25 of the resolver 21, and a detection signal of a second frequency is induced in the detection coils 27 and 28 of the resolver 22
Implementation Method 2
variable reluctance resolver
Data Source
AI summary
Two excitation coils (excitation A coil, excitation B coil) and two detection coils (detection A coil, detection B coil) are provided. The excitation A coil and the excitation B coil are excited at frequencies that are different from each other. The number of turns of the detection A coil and the detection B coil are respectively set with two sine waves using the number ms1 and ms2 of pole pairs. The number ms1 and ms2 of pole pairs, the number mx1 and mx2 of pole pairs of the excitation A coil and the excitation B coil, and the number mr of pole pairs of a rotor are set to have a predetermined relationship. A resolver having redundancy can be realized with small number of coils.