Motor Disconnection Detection Through Phase-Current Alignment Checks
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Solution Overview
Problem
Existing technologies lack a reliable logic for detecting motor disconnection, which can lead to vehicle accidents and motor damage due to inadequate motor control performance when disconnection is not detected.
Innovation Solution
A motor disconnection detection apparatus that includes a phase current detection part to detect phase current at a specific alignment angle and time, and a motor disconnection detection part to determine motor disconnection based on phase currents, using alignment angles of 30° and time intervals of 30 ms, 60 ms, and 90 ms within a 100 ms period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no motor disconnection detection logic is implemented, then the system is simpler, but motor disconnection cannot be detected leading to vehicle accidents and motor damage
Solution Approach 1:
The system performs preliminary current threshold judgment during the alignment period before normal motor operation begins. By detecting whether phase current exceeds a predetermined threshold during this specific period, the system proactively identifies disconnection issues before they can cause damage during normal operation.
Solution Approach 2:
The invention extracts and focuses detection on a specific time window (alignment period) and specific parameter (phase current during alignment). This selective extraction allows the system to monitor for disconnection without requiring continuous complex monitoring of all motor parameters throughout entire operation, thereby achieving reliable detection with reduced system complexity.
2Measurement precision
If phase current is detected at multiple time points within alignment period, then detection accuracy improves, but detection time increases
Solution Approach 1:
The alignment period is segmented into multiple measurement points (first, second, and third measurement points at different times). At each point, the system independently checks whether phase current exceeds the threshold. This segmentation allows the system to accumulate sufficient detection data for accurate disconnection identification while maintaining efficient timing within the overall alignment period.
Data Source
AI summary
A motor disconnection detection apparatus according to one embodiment may include a phase current detection part which detects a phase current at a specific alignment angle and a specific time within a motor alignment period and a motor disconnection detection part which detects disconnection of a motor based on the detected phase current.