Motor Rotor Blocking Detection via Current and Position Analysis
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Solution Overview
Problem
Existing methods for detecting rotor blocking in motors driving actuator members in aircraft are inadequate, leading to potential overheating and damage due to delayed detection and inability to differentiate between genuine blockages and other overheating causes.
Innovation Solution
A method that estimates the position, travel direction, and speed of the actuator member relative to abutments during angular movement to quickly detect rotor blocking, distinguishing between abutment contact and seizing, allowing for timely and appropriate responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power electronics are designed to withstand overheating from rotor blockage, then motor reliability is improved, but device weight and size increase
Solution Approach 1:
The system performs preliminary detection of rotor blockage by monitoring current and position data before overheating occurs. The control unit analyzes the relationship between current amplitude and rotor position to identify blockage conditions early, enabling preventive action before thermal damage can occur, thus eliminating the need for oversized heat-resistant power electronics
Solution Approach 2:
The patent replaces thermal protection mechanisms (thermal relays, heat-resistant components) with an electrical monitoring system that uses current sensors and control unit processing. This substitution of mechanical/thermal protection with electrical detection and control allows for lightweight design while maintaining reliability
2Reliability
If a thermal relay is used to detect overheating, then motor protection is improved, but response time increases
Solution Approach 1:
The patent replaces thermal relays with an electronic control unit that continuously monitors current and position data. This electronic detection system responds instantaneously to blockage conditions by analyzing electrical parameters, eliminating the thermal inertia and delayed response characteristic of thermal relays
Solution Approach 2:
The control unit implements continuous feedback monitoring of current amplitude versus rotor position. When the feedback analysis detects that current remains abnormally high across multiple position cycles, the system immediately identifies blockage and triggers protective action, achieving rapid response through real-time electrical feedback rather than delayed thermal detection
3Reliability
If a thermal relay detects overheating, then motor protection is improved, but ability to distinguish blockage type is lost
Solution Approach 1:
The control unit acts as an intermediary that analyzes the relationship between current amplitude and rotor position to differentiate between genuine blockages and normal high-current operating conditions. By examining the correlation pattern across multiple position cycles, the system identifies whether high current indicates actual blockage or normal operation, preserving diagnostic information that thermal relays cannot provide
Data Source
AI summary
A method of detecting blocking of a rotor of a motor driving an actuator member with movement in translation between a first abutment and a second abutment, the method comprising the steps of, during an angular movement of the rotor, estimating at least a position (X) of the actuator member relative to the two abutments, a travel direction of the actuator member relative to the two abutments, and also a travel speed (V) of the actuator member; and on the basis at least of the estimated position of the actuator member, of the estimated travel direction of the actuator member, and of the estimated travel speed of the actuator member, detecting blocking of the rotor.