Motor Control Method for Scanner Positioning Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor control methods for ultra low speed applications in devices like scanners and printers face challenges in achieving precise positioning and preventing overshooting or prolonged drive times, leading to image quality issues such as the 'jaggy' phenomenon and dark current accumulation.
Innovation Solution
A motor controlling method that adjusts the initial power by measuring the difference between the target and actual positions or drive times, correcting the initial power to prevent overshooting and ensure suitable image quality by reducing standby power and adjusting the duty ratio accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high initial duty is applied to the motor at startup, then the motor can quickly reach the target position, but the motor overshoots the stopping position causing the 'jaggy' phenomenon
Solution Approach 1:
The patent applies dynamics by making the initial duty variable rather than fixed. The control device dynamically adjusts the initial duty based on the relationship between the target position and current position, selecting from multiple predetermined duty values (first through fifth duties) depending on positional conditions. This dynamic adjustment prevents overshooting while maintaining adequate startup speed.
Solution Approach 2:
The patent changes the parameter of initial duty by selecting from multiple predetermined duty values based on positional relationships. Instead of using a single fixed duty cycle, the system switches between different duty parameters (first duty through fifth duty) according to whether the target position is ahead, behind, or coincides with the current position, thereby optimizing both speed and positioning accuracy.
2Manufacturing precision
If a low initial duty is applied to the motor at startup, then the motor avoids overshooting, but the motor cannot reach the target position within the targeted time causing dark current accumulation
Solution Approach 1:
The system dynamically selects from multiple predetermined duty values based on real-time positional feedback. When the target position is ahead of the current position, higher duties (third or fourth duty) are selected to reduce drive time. When the target position coincides with or is behind the current position, lower duties (first or second duty) are selected to prevent overshooting. This dynamic selection resolves the contradiction between speed and precision.
Solution Approach 2:
The patent changes the duty parameter based on positional relationships to optimize both time and precision. By selecting from multiple duty parameters (first through fifth duty) according to whether the target is ahead, behind, or at the current position, the system achieves appropriate drive times that prevent dark current accumulation while maintaining positioning accuracy.
3Manufacturing precision
If the motor drive time is extended to reach the target position, then positioning accuracy improves, but dark current accumulates in the image sensor causing color irregularity
Solution Approach 1:
The control device performs preliminary action by selecting an appropriate initial duty before the motor starts moving. Based on the relationship between target and current positions, the system pre-selects the optimal duty value to ensure the motor reaches the target position within the appropriate time window, preventing both overshooting and excessive drive time that would cause dark current accumulation.
Solution Approach 2:
The patent changes the duty parameter to optimize the balance between positioning accuracy and drive time. By selecting from multiple predetermined duties based on positional relationships, the system achieves accurate positioning while maintaining drive times that prevent dark current accumulation and subsequent color irregularity in the image sensor.
Data Source
AI summary
A motor controlling method according to the present invention involves causing rotation of a motor to commence by applying an initial power that can cause movement of an object to be transported to commence, to the motor; obtaining a position of the object to be transported after the motor has been controlled so as to cause the object to be transported to move to a target position based on a signal outputted in response to the rotation of the motor; and correcting an initial power to be used when movement of the object to be transported is caused to commence a next time in response to a difference between the target position and the obtained position of the object to be transported.