Resolver Abnormality Detection Using Segmented DC Voltage Monitoring
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Solution Overview
Problem
Existing resolver abnormality detection systems cannot reliably detect wire breakages at specific rotational angles of the rotor, limiting their effectiveness in identifying such faults.
Innovation Solution
A resolver abnormality detection apparatus with differential input sections and resistor configurations across secondary windings, allowing for the detection of wire breakages, sky faults, and ground faults without angular position limitations, using a microcomputer to analyze output voltages from filters and differential input sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the equation sin(θ)^2+cos(θ)^2=1 is used for wire breakage detection, then interphase short circuits can be detected, but wire breakages at specific rotational angles (e.g., θ=0°) cannot be detected
Solution Approach 1:
The detection function is segmented into multiple independent detection paths: one path uses the traditional sin(θ)^2+cos(θ)^2=1 equation for detecting interphase short circuits, while another path monitors DC voltages at specific phases to detect wire breakages. This segmentation allows each detection method to operate independently, ensuring that wire breakages at any rotational angle can be detected without being limited by the mathematical relationship that works for interphase short circuit detection.
Solution Approach 2:
The detection apparatus is designed with multi-functionality to handle different types of abnormalities through a unified system. The same detection apparatus can detect interphase short circuits using the sin(θ)^2+cos(θ)^2=1 equation, wire breakages using DC voltage monitoring, and ground faults using the combination of both methods. This universal approach ensures comprehensive detection coverage across all rotational angles and all types of resolver abnormalities.
2Reliability
If DC voltage monitoring is added to detect wire breakages, then detection coverage improves, but device complexity increases
Solution Approach 1:
The detection apparatus merges the traditional interphase short circuit detection function with the new wire breakage detection function into a single integrated system. By combining both detection methods in one apparatus and using a unified abnormality determination logic, the patent avoids the need for completely separate detection circuits, thereby reducing overall device complexity while maintaining comprehensive detection capability.
Solution Approach 2:
The detection apparatus is designed with multi-functionality to handle different types of abnormalities through a unified system. The same detection apparatus can detect interphase short circuits using the sin(θ)^2+cos(θ)^2=1 equation, wire breakages using DC voltage monitoring, and ground faults using the combination of both methods. This universal approach ensures comprehensive detection coverage across all rotational angles and all types of resolver abnormalities.
Data Source
AI summary
A resolver abnormality detection apparatus for a resolver having first and second secondary windings includes a first resistor section including a first pull-up resistor for pulling up the first secondary winding, a first pull-down resistor for pulling down the first secondary winding, a second resistor section including a second pull-up resistor for pulling up the second secondary winding and a second pull-down resistor for pulling down the second secondary winding, and first and second differential input sections connected across the first secondary winding and across the second secondary winding, respectively. The resolver abnormality detection apparatus detects presence of an abnormality in each of the first and second secondary windings based on outputs of the first and second differential input sections, a DC voltage between the first resistor section and the first differential input section and a DC voltage between the second resistor section and the second differential input section.