Multi-Motor Output Shaft Control for Abnormal Motor Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric aircraft with multiple motors face challenges in identifying abnormal motors during operation, especially when all motors are driven simultaneously, as the rotational speeds become identical, making it difficult to determine which motor is abnormal.
Innovation Solution
The electric movable body incorporates a double drive control unit that assigns drive states to at least two motors, a single drive control unit that switches to single drive mode when an abnormality is detected, and an abnormality determination unit that identifies abnormal motors based on predetermined state quantities correlated with the drive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple motors are driven simultaneously to maintain system performance, then power output is improved, but the ability to identify abnormal motors deteriorates due to identical rotational speeds
Solution Approach 1:
The system dynamically changes the drive state of motors based on operational phase: in normal operation, multiple motors are driven simultaneously to maintain power output; when abnormality is detected, the system transitions to single-drive mode by stopping one motor and driving another, enabling abnormality identification through differential rotational speed analysis
2Measurement precision
If single drive mode is used to identify abnormal motors, then measurement precision is improved, but system power output deteriorates
Solution Approach 1:
The system employs periodic switching between double-drive and single-drive modes, allowing alternating phases of high-power operation and diagnostic operation, thereby achieving both sustained power output and periodic abnormality detection
Solution Approach 2:
The system performs preliminary abnormality detection by analyzing rotational speeds during single-drive mode before committing to long-term operational decisions, enabling early identification of motor abnormalities while maintaining overall system performance
3Productivity
If double drive control is used to maintain performance, then productivity is improved, but reliability deteriorates due to inability to detect motor abnormalities
Solution Approach 1:
The system continuously monitors rotational speeds of all motors and uses this feedback to determine abnormality, switching between double-drive and single-drive modes based on the feedback signal, thereby maintaining both productivity through continuous operation and reliability through active monitoring
Data Source
AI summary
An electric movable body includes an output shaft and multiple motors that drive the output shaft. The electric movable body performs a double drive control to assign a drive state to at least two of the motors, performs, when the double drive control is performed and on determination that one of the motors is abnormal, a single drive control to assign the drive state to only one of the motors and to assign a stop state to another of the motors, and identifies, when the single drive control is performed, a drive motor, to which the drive state is assigned and which is abnormal, based on a predetermined state quantity correlated with a drive state of the drive motor.