Redundant Resolver with Two-Phase Excitation Windings
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Solution Overview
Problem
Conventional resolvers have issues with redundancy, size, and reliability due to single-phase excitation and non-redundant configurations, leading to functional failures upon winding breaks.
Innovation Solution
A phase modulation-type redundant two-phase-output resolver with two-phase excitation and output, where the excitation winding consists of mutually different phases, allowing for at least one-phase output even if one winding breaks, and two-phase output if an excitation winding breaks, ensuring continued operation and increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-phase excitation is used in conventional resolvers, then the device complexity is reduced, but the reliability deteriorates because the system becomes non-functional upon excitation winding break
Solution Approach 1:
The excitation winding is segmented into two independent one-phase excitation windings (first and second excitation windings) that are disposed at different radial positions relative to the stator core. This segmentation allows the system to maintain functionality even if one winding breaks, as the other winding can continue to provide excitation signals for angle detection.
2Reliability
If redundant system is implemented using two separate resolvers as in conventional art, then the reliability is improved, but the device size increases
Solution Approach 1:
Two independent one-phase excitation windings and two two-phase output windings are merged into a single resolver structure sharing common magnetic circuits. This integration achieves redundant angle detection capability within one compact device, eliminating the need for two separate resolvers and thereby reducing overall device size while maintaining reliability.
3Reliability
If two-phase excitation and output windings are configured independently as in conventional redundant structures, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The first and second output windings are configured to serve multiple functions: they can operate independently as one-phase output windings or together as two-phase output windings. This multi-functionality allows the system to maintain angle detection capability in various failure scenarios without requiring complex additional components, thereby improving reliability while controlling device complexity.
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 solution enhances the reliability of the resolver by maintaining functionality even with single winding failures, achieving a redundant system and similar output performance to conventional resolvers.
Implementation Method 1
with changes in gap permeance in conjunction with the rotation of the rotor being detected as output voltages from the output windings
Data Source
AI summary
The present invention relates to a phase modulation-type redundant two-phase-output resolver, an excitation signal (100) is applied to an excitation winding (50) of an annular stator (21) having a VR-type rotor (20) disposed therein, and a two-phase output signal (101) is outputted from first and second output windings (43, 44) that are provided in the annular stator (21), the excitation winding (50) is made up of first and second excitation windings (40, 41) of mutually different phases, and the excitation signal (100) has two phases, and even in a case where a break occurs in only any one winding from among the first and second excitation windings (40, 41) and the first and second output windings (43, 44), at least a one-phase output signal can be obtained.