Brushless DC Motor Bearing Life Monitoring With Adaptive Speed Control
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Solution Overview
Problem
Existing brushless DC motors lack the ability to provide detailed information about abnormal operations, making it difficult to identify and diagnose issues, which increases maintenance time and costs, and the life span is primarily determined by the bearing, necessitating a method to estimate used time and provide real-time alarms.
Innovation Solution
Incorporating an integrated circuit chip with a detection unit, central processing unit, and flash memory to monitor the motor's operation state, calculate running time, record abnormal events, estimate bearing life, and provide real-time alarm signals when the bearing's used time exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brushless DC motor enters protection state when abnormal condition occurs, then motor safety is improved, but diagnostic information availability deteriorates
Solution Approach 1:
The control unit records abnormal operation information and operation time in advance before the bearing actually fails, storing data such as current, voltage, and running time during abnormal conditions. This preliminary recording ensures diagnostic information is preserved even when the motor enters protection state or stops operating.
Solution Approach 2:
The control unit acts as an intermediary between the motor's operation and the external diagnostic system. It accumulates and processes operation data, then transmits this information externally so that detailed abnormal condition data becomes available for analysis without requiring direct access to the motor during protection state.
2Measurement precision
If multiple attempts are performed to identify abnormal condition type and cause, then diagnostic accuracy is improved, but time consumption and labor cost increase
Solution Approach 1:
The control unit performs preliminary recording of operation time and abnormal condition parameters during motor operation, storing current, voltage, and timing data before diagnostic analysis is needed. This eliminates the need for multiple trial attempts to recreate abnormal conditions, as all necessary data is already captured.
Solution Approach 2:
The system provides feedback by transmitting recorded abnormal operation information and operation time to external devices, enabling immediate diagnostic analysis. This feedback loop replaces iterative trial-and-error methods with direct data-based diagnosis, significantly reducing diagnostic time and labor costs.
3Device complexity
If bearing operation time is not monitored, then device complexity is reduced, but maintenance timing precision deteriorates
Solution Approach 1:
The control unit performs multiple functions: it controls motor operation, monitors abnormal conditions, records operation time, and transmits diagnostic data. By making the control unit multi-functional, the patent avoids adding separate monitoring devices, thus maintaining low system complexity while achieving precise bearing life tracking.
Solution Approach 2:
The control unit automatically records and accumulates operation time during motor operation without external intervention. It self-manages the data collection and transmission processes, eliminating the need for separate monitoring systems or manual tracking, thereby maintaining simplicity while enabling precise maintenance scheduling.
Data Source
AI summary
A method of adaptively controlling a brushless DC motor includes steps of: controlling the brushless DC motor rotating at a first speed according to an operation curve, accumulating a running time of the brushless DC motor, estimating a remaining used time of a bearing of the brushless DC motor according to the accumulated running time, executing an alarm operation when the remaining used time is less than a predetermined time, and decreasing the speed of the brushless DC motor to run at a second speed to prolong the used time of the bearing.