Compressor Rotation Direction Detection to Prevent Premature Failure

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Solution Overview

Problem

Compressors in refrigeration and HVAC systems can suffer premature failure due to improper operation, often caused by incorrect phase commutation during installation or manufacturing, leading to wear and damage, resulting in increased defective parts per million (DPPM) within 90 days and potentially throughout their lifespan.

Innovation Solution

A method and system for detecting and correcting improper compressor operation by comparing measured sensor profiles with stored profiles upon startup, using a compressor drive module to confirm and correct operation, ensuring the compressor operates in the correct direction, thereby preventing damage and extending compressor lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the compressor is operated in a reverse direction due to incorrect phase commutation, then the compressor can start and run, but the compressor components suffer wear and damage leading to premature failure

Engineering Contradiction:

Improvecompressor startupVSAvoidcompressor lifespan

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs preliminary detection of compressor rotation direction immediately upon startup by monitoring back-EMF signals before the compressor begins normal operation. This early detection prevents the compressor from operating in reverse, avoiding wear and damage to internal components while ensuring reliable operation throughout its lifespan.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors compressor operation parameters including back-EMF signals and current draw to provide real-time feedback on rotation direction. When reverse rotation is detected, the system automatically triggers a correction sequence that reverses the phase sequence of the motor, ensuring the compressor operates in the correct direction and preventing premature failure.

Inventive Principle:

Principle #23Feedback

2Productivity

If the compressor operates in reverse direction for a long period, then the compressor can maintain operation, but lubrication fails and excessive heat buildup occurs

Engineering Contradiction:

Improvecompressor operation continuityVSAvoidlubrication failure and heat buildup

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system detects reverse rotation direction immediately upon startup by analyzing back-EMF signals before significant operating time accumulates. This preliminary detection prevents the compressor from operating in reverse for any extended period, thereby avoiding lubrication failure and excessive heat buildup while maintaining continuous productive operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system rapidly detects and corrects reverse rotation by monitoring back-EMF signals and automatically reversing phase sequence within seconds of startup. This rapid correction prevents the compressor from operating in reverse long enough to cause lubrication failure or heat buildup, effectively skipping the harmful operational state.

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS10520234B2Methods and systems for preventing premature compressor failure from improper operation

Publication Date: 2019.12.31 THERMO KING CORP

AI summary

Methods and systems for detecting and correcting improper operation of a compressor in a refrigeration system and/or an HVAC system include a component level detection and prevention and a system level detection and prevention. The system level detection and prevention can be a backup or a confirmation of the component level detection and prevention. The component level detection and prevention can detect and prevent improper compressor operation within a predetermined time so that the compressor's operation period in an improper direction can be minimized, thereby minimizing wear and damage to the compressor.