Coil Diagnostic Device Using Impulse Voltage Response
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Solution Overview
Problem
Existing diagnostic techniques for coils struggle to effectively detect insulation degradation between conductors of the same electrical potential, as it does not significantly affect electrical performance, making it difficult to diagnose coil quality using feature amounts like LC and RC.
Innovation Solution
A diagnostic device that applies an impulse voltage to a coil, detects the response voltage, and calculates a determination index using zero cross points and peak voltages in addition to circuit constants, allowing for the detection of insulation degradation between conductors with the same or different electrical potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit constants (LC and RC) are used as determination indexes for coil diagnosis, then electrical performance-related abnormalities can be detected, but insulation degradation between conductors of the same electrical potential cannot be detected
Solution Approach 1:
The patent introduces new determination indexes (zero cross point and peak voltage) that represent different electrical characteristics of the coil. By adding these new parameters to the existing circuit constants (LC and RC), the diagnostic system can detect a broader range of abnormalities including insulation degradation between conductors of the same potential, which cannot be detected by circuit constants alone.
2Device complexity
If only circuit constants are used for diagnosis, then the diagnostic method remains simple, but the target range of coil quality assessment is limited
Solution Approach 1:
The patent makes the diagnostic device multi-functional by enabling it to calculate multiple types of determination indexes (circuit constants LC and RC, zero cross point, and peak voltage). This allows a single diagnostic system to assess various aspects of coil quality including insulation degradation between conductors of the same potential and different potentials, as well as overall coil performance, without requiring separate diagnostic methods for each type of assessment.
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
Enables the accurate diagnosis of coil quality over a wider target range by identifying changes in zero cross points and peak voltages, effectively detecting insulation issues that may not impact electrical performance.
Implementation Method 1
a voltage application unit that applies an impulse voltage to a coil
Implementation Method 2
feature amounts (LC and RC) of a coil are calculated based on a response voltage... LC is the product of an inductance and a capacitance
Implementation Method 3
a response voltage detection unit that detects a response voltage from the coil with respect to the impulse voltage
Data Source
AI summary
Provided is a diagnostic device for a coil including a voltage application unit applying an impulse voltage to the coil; a response voltage detection unit detecting a response voltage from the coil with respect to the impulse voltage; an index calculation unit calculating a determination index indicating an electrical feature of the coil based on the response voltage; and a determination unit determining whether there is an abnormality in a target coil to be diagnosed by comparing the determination index of a reference coil that is the coil that is normal and the determination index of the target coil. At least one of a zero cross point at which the response voltage intersects with a reference voltage and a peak voltage on a positive side and a negative side of the response voltage is used as the determination index, in addition to a circuit constant of the coil.