Motor Abnormality Detection via Position Signal Phase Change
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Solution Overview
Problem
Motor drive control devices often fail, leading to motor inoperability, which can cause cooling systems to malfunction due to inverse rotation of fan motors, resulting in deteriorated cooling functions.
Innovation Solution
An abnormality determination device that rapidly detects changes in motor position signals to switch between two drive circuits, ensuring continuous motor operation by switching to a backup drive circuit when abnormalities are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single drive circuit is used for motor control, then the device complexity is reduced, but the reliability deteriorates because the motor cannot operate when the drive circuit fails
Solution Approach 1:
The patent applies preliminary action by measuring the time period of position signals in advance and comparing it with a predetermined threshold before motor operation continues. This allows the system to detect drive circuit abnormalities early and switch to the other drive circuit before complete failure occurs, maintaining motor operation reliability without requiring complex real-time intervention systems
Solution Approach 2:
The patent merges two drive circuits into a single motor control system where both circuits can control the same motor. When one drive circuit is detected as abnormal, the system automatically switches to the other drive circuit, combining the functionality of both circuits to ensure continuous operation and improve reliability
2Loss of time
If rapid abnormality detection is implemented, then the response time is improved, but the device complexity increases due to additional detection and comparison components
Solution Approach 1:
The patent applies self-service by using the motor's own position signal to detect drive circuit abnormalities. The system measures the time period of the position signal generated by the motor and compares it with a predetermined value, allowing the motor control system to self-diagnose without requiring external detection equipment, thus reducing device complexity while achieving rapid abnormality detection
3Object-affected harmful factors
If the motor is allowed to operate without drive circuit redundancy, then the device complexity is reduced, but the harmful factors increase due to inverse rotation when drive circuit fails
Solution Approach 1:
The patent applies preliminary action by detecting drive circuit abnormalities through position signal time period measurement before the motor can undergo inverse rotation. The system compares the measured time period with a predetermined threshold and switches to the backup drive circuit proactively, preventing the harmful effect of inverse rotation before it occurs
Solution Approach 2:
The patent applies preliminary anti-action by implementing a detection mechanism that identifies drive circuit failures before they cause inverse rotation. The system measures position signal time periods and compares them with predetermined values to detect abnormalities early, then switches to the other drive circuit to counteract the potential harmful effect of inverse rotation before it damages the motor
Data Source
AI summary
An abnormality determination device has a detection unit configured to detect a change in a phase of a position signal, the phase of the position signal changing depending on a rotation of a rotor of a motor, a time measurement unit configured to measure a time depending on a detection timing of the detection of the change in the phase of the position signal, a comparison unit configured to compare a first time measured by the time measurement unit with a second time measured before the first time is measured, and a determination unit configured to determine that a drive state of the motor is abnormal based on a comparison result of the comparison of the first time with the second time.