Battery-Aware Printer Motor Control for Gear Damage Detection
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Solution Overview
Problem
Existing printer technologies fail to accurately distinguish between fluctuations in DC motor rotational speed caused by battery voltage fluctuations and actual gear damage, leading to unnecessary motor shutdowns and potential gear damage.
Innovation Solution
A printer system that calculates fluctuation parameters based on previous detection signals to determine the relationship between successive detection signals, allowing it to differentiate between battery voltage fluctuations and actual gear issues, thereby preventing unnecessary motor shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor control device stops the DC motor when the rotational speed falls below a lower limit rotational speed, then the gear damage is suppressed, but the motor is unnecessarily stopped when the speed drop is caused by battery voltage fluctuations
Solution Approach 1:
The control device monitors the detection signal over time and compares the current rotational speed with the previous rotational speed to determine the cause of speed drops. By using feedback from historical data, the system can distinguish between battery voltage fluctuations and actual gear problems, preventing unnecessary motor shutdowns while still protecting the gear when needed.
Solution Approach 2:
The system performs preliminary comparison of detection signals before triggering a motor shutdown. By analyzing the pattern of rotational speed changes in advance and comparing with predetermined thresholds, the system can predict whether a speed drop indicates a gear problem or a battery fluctuation, allowing it to take appropriate action before damage occurs or unnecessary shutdown happens.
2Device complexity
If the motor control device uses a fixed threshold to detect gear damage, then the detection is simple, but it cannot distinguish between battery voltage fluctuations and actual gear damage
Solution Approach 1:
The detection mechanism transitions from a static fixed threshold to a dynamic comparison-based approach. The system continuously compares the current detection signal with the previous detection signal and uses predetermined thresholds to dynamically determine whether a speed drop indicates gear damage or battery fluctuation, improving detection accuracy without significantly increasing complexity.
Data Source
AI summary
The printer includes a head, a platen roller, a drive gear, a DC motor, a processor, and a memory. The head is configured to perform, using power from a battery, printing on a medium. The platen roller is configured to transport the medium. The drive gear is configured to drive the platen roller. The DC motor is configured to be rotated by the power from the battery, and drive the drive gear. The memory stores computer-readable instructions. The instructions instruct the processor to perform processes. The processes include detecting, N times, a detection signal corresponding to a rotational speed of the DC motor, N being a positive number of 2 or more. The processes include calculating an N−1th fluctuation parameter calculated based on the detected N−1th detection signal. The processes include determining a relationship between the calculated N−1th fluctuation parameter and the detected Nth detection signal.