Sheet Conveying Motor Control for Overheat-Limited Operation
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Solution Overview
Problem
Existing image processing apparatuses face challenges in effectively suppressing motor temperature rise during prolonged motor operation, leading to potential failure and complications in controlling the motor's drive based on temperature prediction, which complicates the system configuration.
Innovation Solution
Implementing a control mechanism that includes first and second determination processing portions to restrict motor drive based on total drive time and elapsed time within specific periods, switching to low-speed conveying modes when thresholds are exceeded, thereby preventing motor overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor drives the sheet continuously without restriction, then the productivity is improved, but the motor temperature rises excessively causing potential failure
Solution Approach 1:
The control portion implements periodic monitoring of motor drive time within determination periods, and periodically restricts drive operation when thresholds are exceeded. This periodic control mechanism prevents continuous overheating while maintaining productivity during normal operation cycles.
Solution Approach 2:
The system predicts future motor temperature rise based on accumulated drive time before actual overheating occurs. By restricting drive operation in advance when determination period thresholds are exceeded, the system prevents temperature-related failures before they happen, ensuring reliability.
2Reliability
If temperature prediction control is implemented to suppress motor temperature rise, then the motor reliability is improved, but the system configuration becomes complicated
Solution Approach 1:
The system replaces complex physical temperature sensing and prediction hardware with a simplified control algorithm that uses timing information and determination periods. The control portion calculates drive time accumulation and compares it against predetermined thresholds, eliminating the need for complex temperature sensors and prediction models.
Solution Approach 2:
The control system uses its own internal timing mechanisms and drive operation data to self-regulate motor temperature. By monitoring its own drive time accumulation within determination periods and autonomously restricting operation when needed, the system achieves temperature control without external monitoring equipment.
3Reliability
If the motor drive is restricted frequently to prevent overheating, then the motor temperature control is improved, but the productivity decreases
Solution Approach 1:
The system dynamically adjusts the determination period length based on motor temperature conditions. When the motor is cool, longer determination periods allow more flexible drive operation. When temperature rises, the determination period shortens, automatically reducing drive frequency to prevent overheating while maximizing productivity during safe operating windows.
Solution Approach 2:
The control system adaptively modifies drive restriction timing based on accumulated drive time within determination periods. Rather than fixed restrictions, the system dynamically determines when to restrict drive operation based on real-time drive time accumulation, optimizing the balance between temperature control and productivity.
Data Source
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AI summary
A sheet conveying device includes a motor (27A), a first determination processing portion (52), and a first restriction processing portion (53). The motor (27A) is used to convey a sheet. The first determination processing portion (52) determines, each time a predetermined determination timing arrives during drive of the motor (27A), whether or not a total drive time of the motor (27A) in a predetermined determination period (Z10) up to the arrival of the determination timing exceeds a predetermined first time (X1). The first restriction processing portion (53) restricts the drive of the motor (27A) when the first determination processing portion (52) determines that the total drive time exceeds the first time (X1).