Motor Speed Oscillation Monitoring for Failed Channel Identification

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Solution Overview

Problem

In power drive units (PDU) with multiple input channels, determining which channel has failed is challenging due to mechanical connections causing normally functioning channels to exhibit similar output patterns to failed channels, making it difficult to identify and shut down the faulty channel.

Innovation Solution

A monitoring system that uses a speed sensor to detect motor speed and provide a speed signal, and a processor to identify symmetric and asymmetric oscillations in the signal, allowing differentiation between failed and functioning channels by comparing the signal to threshold speeds and using counters to determine the type of oscillation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple input channels are used in power drive units to maintain operation during failure, then system reliability is improved, but the ability to identify which channel has failed deteriorates due to mechanical connections causing similar output patterns

Engineering Contradiction:

Improvesystem reliabilityVSAvoidchannel failure identification

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The monitoring system segments the analysis by creating separate counters for different oscillation types (symmetric and asymmetric). Each counter independently tracks its respective oscillation pattern, allowing the system to identify failed channels by comparing which counter reaches its threshold first, thus resolving the identification difficulty while maintaining multi-channel operation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of trying to detect failure directly, the system inverts the approach by monitoring for specific oscillation patterns that indicate failure. By counting symmetric and asymmetric oscillations and comparing which type predominates, the system can identify the failed channel through the characteristic oscillation pattern it produces, rather than trying to detect the absence of normal operation

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If mechanical connections are used to couple channels, then the system can continue operating in failed channels, but normally functioning channels are affected by failed channels causing them to exhibit similar output patterns

Engineering Contradiction:

Improvecontinued operation capabilityVSAvoidchannel status detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The system applies local quality by analyzing the specific characteristics of oscillations in each channel independently. By creating separate counters for symmetric and asymmetric oscillations and comparing their values, the system can locally identify which specific channel has failed based on the unique oscillation pattern it generates, even when other channels are mechanically coupled and showing similar overall behavior

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11235886B2Monitoring system for identifying an operating state of a motor

Publication Date: 2022.02.01 GOODRICH ACTUATION SYST

AI summary

A monitoring system is disclosed for identifying an operating state of a motor, the system comprising: a speed sensor for determining a speed of a motor and providing a speed signal as a function of time in response thereto, and a processor configured to identify a symmetric and/or an asymmetric oscillation of the speed signal as a function of time.