Rotary Electric Machine Fatigue Control via Speed and Temperature Monitoring
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Solution Overview
Problem
Rotary electric machines lack effective monitoring and control mechanisms to prevent fatigue, leading to potential damage and increased costs due to unregulated operation within critical rotation speed and temperature zones.
Innovation Solution
A control system that includes a rotation speed sensor, temperature sensor, and a control device to calculate the fatigue degree of the rotor based on operation time and temperature, limiting rotor speed or alerting the user when the fatigue degree exceeds a threshold, thereby preventing damage and optimizing material selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotary electric machine operates without fatigue monitoring, then the device complexity is reduced, but the reliability deteriorates due to potential rotor damage
Solution Approach 1:
The control device calculates fatigue degree in advance by accumulating operation time data and comparing it against predefined thresholds before actual rotor damage occurs. This preliminary monitoring and prediction mechanism prevents damage by taking action before the critical failure point is reached, resolving the contradiction between reliability improvement and system complexity.
2Productivity
If the rotary electric machine operates at high rotation speeds and temperatures, then the productivity is improved, but the fatigue degree increases leading to reduced reliability
Solution Approach 1:
The control device continuously monitors operation time accumulated under different rotation speed and temperature conditions, calculates the resulting fatigue degree, and provides feedback to determine whether to limit further operation. This closed-loop feedback mechanism enables the system to maintain high productivity when fatigue is low while automatically preventing operation that would lead to excessive fatigue, thus resolving the contradiction between productivity and reliability.
3Productivity
If the operation time is extended without limits, then the productivity is improved, but the fatigue degree exceeds threshold values causing rotor damage
Solution Approach 1:
The control device dynamically adjusts the allowable operation time and rotation speed limits based on the calculated fatigue degree. As fatigue accumulates, the system dynamically reduces permitted operation parameters, and when fatigue decreases or is reset, higher parameters become available again. This dynamic adaptation resolves the contradiction by allowing extended operation when safe while preventing operation that would exceed strength limits.
Data Source
AI summary
A rotary electric machine control system includes a rotary electric machine, a rotation speed sensor, a temperature sensor, and circuitry. The rotary electric machine includes a rotor. The rotation speed sensor is to detect a rotation speed of the rotor. The temperature sensor is to detect a temperature of the rotary electric machine. The circuitry is configured to classify an operation time during which the rotor rotates based on the rotation speed detected by the rotation speed sensor and the temperature detected by the temperature sensor. The circuitry is configured to calculate a fatigue degree of the rotor based on the operation time classified. The circuitry is configured to limit the rotation speed of the rotor or output a signal to a user when the fatigue degree exceeds a threshold value.