Motor Control for Image Forming Apparatus
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Solution Overview
Problem
Continuous operation of motors in image forming apparatuses leads to increased motor temperature and resistance, causing malfunction and deterioration of control properties.
Innovation Solution
An image forming apparatus with a controller that detects motor driving information, calculates temperature differences, and operates motors with a delay to prevent overheating, using a proportional integral control command to adjust motor speed and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is operated continuously without pause to achieve fast printing speed, then the printing speed is improved, but the motor temperature rises and motor resistance increases, causing deterioration of motor properties
Solution Approach 1:
The patent applies periodic action by introducing pause periods between continuous printing operations. The controller is configured to pause the printing operation when the motor temperature exceeds a predetermined threshold, allowing the motor to cool down periodically. This prevents continuous operation from causing excessive temperature rise and motor resistance increase, thereby maintaining motor reliability while still achieving high printing speeds during active printing periods.
2Productivity
If the motor temperature rises beyond a proper level, then the motor may malfunction, but continuous operation is needed to maintain fast printing speed
Solution Approach 1:
The patent implements feedback control by using a temperature sensor to continuously monitor the motor temperature and comparing it with a predetermined threshold value. When the temperature exceeds the threshold, the controller receives feedback and automatically pauses the printing operation to allow cooling. This closed-loop feedback mechanism effectively controls motor temperature without requiring manual intervention, maintaining both productivity and preventing harmful temperature effects.
3Reliability
If a delay is introduced in motor operation to allow cooling, then motor temperature is controlled, but printing speed may be reduced
Solution Approach 1:
The patent applies partial action by implementing selective pausing rather than continuous operation delays. The printing operation is paused only when the motor temperature exceeds the predetermined threshold, and resumes immediately when the temperature is within acceptable range. This partial application of delay ensures motor temperature control is maintained while minimizing the impact on overall printing speed, as delays are introduced only when necessary.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents motor overload and maintains control properties by managing motor temperature, ensuring optimal printing speed and performance.
Implementation Method 1
a temperature of the motor rises and motor resistance also increases, thereby deteriorating properties of the motor
Data Source
AI summary
An image forming apparatus, includes an image forming unit, a driver having a driving unit as a driving source of the image forming unit, a detector which detects driving information of the driving unit, and a controller which controls the driver to operate with a delay time corresponding to a difference between the detected driving information and a reference value.