Resolver Abnormality Detection Using Periodic Signal Separation
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Solution Overview
Problem
In redundant system resolvers, magnetic interference between systems occurs, causing components from one system's excitation AC voltage to be included in the output signals of the other system, which complicates abnormality detection, especially when the periods of the AC voltages are different.
Innovation Solution
An abnormality detection apparatus for resolvers is introduced, which includes a first system and a second system with different excitation AC voltage periods. This apparatus detects output signals from each system's output windings, reduces components from the other system's period using specific processing units, and calculates a square sum to determine system abnormalities based on predefined normal ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic interference occurs between first system and second system in redundant resolver, then output signals contain components from both systems, but abnormality detection accuracy deteriorates
Solution Approach 1:
The patent segments the resolver output signals into first system components and second system components by utilizing the different excitation AC voltage periods. The signal processing unit separates these components through period-based filtering, allowing independent abnormality detection for each system despite magnetic interference between them.
Solution Approach 2:
The patent employs periodic action by using different excitation AC voltage periods for the first and second systems. This period differentiation enables the signal processing unit to distinguish and separate the output signals of both systems through temporal filtering, resolving the interference problem while maintaining redundancy.
2Measurement precision
If different excitation AC voltage periods are used for first system and second system, then magnetic interference components can be differentiated, but signal processing complexity increases
Solution Approach 1:
The patent uses different excitation AC voltage periods for the first and second systems, creating periodic signal characteristics that enable differentiation. The signal processing unit leverages this periodicity through temporal filtering and correlation techniques to separate the signals, achieving accurate component identification without requiring overly complex processing.
Solution Approach 2:
The patent implements feedback mechanisms where the signal processing unit continuously monitors the output signals, compares them against expected patterns based on the excitation periods, and adjusts processing parameters accordingly. This feedback loop enables accurate separation of magnetic interference components while keeping the processing algorithm manageable through adaptive rather than purely deterministic methods.
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 apparatus effectively reduces the impact of magnetic interference, allowing for accurate abnormality detection in each system even when their AC voltage periods differ, thereby enhancing redundancy and reliability in motor drive systems.
Implementation Method 1
the resolver is used well as the angle detection device which detects the rotational angle of the motor
Implementation Method 2
a component resulting from the excitation AC voltage in the other of the first system and the second system is included
Data Source
AI summary
To provide an abnormality detection apparatus for resolver which can determine the abnormality of at least the first system, even if the period of the excitation AC voltage of the first system and the period of the excitation AC voltage of the second system are different periods, and the magnetic interference between systems occurs. An abnormality detection apparatus for resolver applies an AC voltage of a first period to a first system excitation winding; applies an AC voltage of a second period different from the first period to a second system excitation winding; calculates a first system square sum which is a sum of square values of the detection values of output signals of first system two output windings after the second period component reduction processing: and determines abnormality of first system based on whether or not the first system square sum is within a normal range of first system.