Motor Control Device for DC Motor Position Accuracy
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Solution Overview
Problem
The replacement of stepping motors with DC motors in image processing apparatuses leads to a deterioration in motor control accuracy due to differences in drive control mechanisms, resulting in inaccurate position and speed information processing, which affects the overall efficiency and precision of motor control.
Innovation Solution
A motor control device that generates target rotation position and speed information for the DC motor, detects actual positions and speeds, calculates error signals, smooths these signals using a low-pass filter, and outputs drive voltage to maintain accurate motor control, thereby preventing the deterioration of motor control accuracy associated with motor replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a DC motor replaces a stepping motor, then drive efficiency is improved, but motor control accuracy deteriorates due to discrete position information processing
Solution Approach 1:
A low-pass filter is introduced as an intermediary component between the encoder and the control unit. The filter processes the pulse-like speed information from the encoder, converting it into smooth analog signals that the control unit can accurately process, thereby maintaining control precision while using the more efficient DC motor
Solution Approach 2:
The patent replaces the discrete digital processing system with an analog signal processing approach. By converting discrete position pulses into continuous analog speed signals through differentiation and low-pass filtering, the system achieves smoother control without the aliasing problems inherent in discrete systems
2Device complexity
If a discrete system is used for control processing, then digital computation is simplified, but feedback information is lost due to aliasing signal processing
Solution Approach 1:
The low-pass filter serves as an intermediary that prevents information loss before the discrete control processing stage. By smoothing the speed signals beforehand, it ensures that the subsequent digital processing receives clean, aliasing-free input signals that retain all necessary feedback information
Data Source
AI summary
A motor control device includes: a unit configured to generate a target rotation position information of a first driving motor based on target rotation position signals indicating a target rotation position of a second driving motor being replaced with the first driving motor; a unit configured to generate a speed predicting of the first driving motor; a unit configured to detect a rotation position of the first driving motor; a unit configured to generate an actual position information of the first driving motor; a unit configured to generate an actual speed of the first driving motor; a unit configured to correct an error between the target rotation position and the actual rotation position of the first driving motor; a unit configured to generate a speed error signal; a unit configured to generate a speed control signals of the first driving motor; and a unit configured to output a drive voltage.