Motor Driver Direct Feedback Control for Precise Positioning
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Solution Overview
Problem
Conventional motor drivers experience a decrease in control accuracy due to time lag between sensor sensing and feedback transmission, affecting the precision of object positioning.
Innovation Solution
A motor driver configuration that includes a correction command output part and a position controller, allowing direct feedback from a displacement sensor to the motor without passing through the controller, along with a switching part and saturation processor to manage command outputs and prevent interference and rapid motor driving defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If feedback is transmitted via the controller, then the system structure is simple, but time lag occurs and control accuracy decreases
Solution Approach 1:
The patent divides the feedback path into two independent channels: a fast position feedback channel that bypasses the controller and goes directly to the motor driver, and a separate controller channel for other control functions. This segmentation allows position feedback to be transmitted without time lag while maintaining system functionality.
Solution Approach 2:
The patent introduces an intermediary position feedback terminal in the motor driver that directly receives position feedback signals from the external terminal, bypassing the controller. This intermediary structure enables direct position feedback transmission and eliminates the time lag caused by controller processing.
2Loss of time
If direct feedback path is added, then time lag is reduced, but device complexity increases
Solution Approach 1:
The patent merges the position feedback reception function into the existing motor driver structure by adding a position feedback terminal that directly connects to the motor driver's internal processing. This integration approach adds minimal complexity while achieving direct feedback transmission.
Solution Approach 2:
The motor driver is designed with multi-functionality, serving both as a power amplifier and a position feedback processing unit. By making the motor driver universal in its functions, the patent eliminates the need for separate feedback processing hardware, thereby reducing overall system complexity.
3Measurement precision
If correction command is output based on displacement sensor, then control accuracy is improved, but interference and rapid driving defects may occur
Solution Approach 1:
The patent applies preliminary filtering and saturation processing to the displacement sensor output before it is used to generate correction commands. This preliminary action prevents harmful interference and rapid driving defects by preparing the signal in advance, ensuring it is clean and within safe limits.
Solution Approach 2:
The patent implements saturation processing that limits the correction command output to predetermined ranges, providing beforehand cushioning against excessive correction signals that could cause rapid driving defects. This protective measure is built into the signal processing chain to prevent harmful effects before they occur.
Data Source
AI summary
A motor driver drives a motor that controls a position of an object based on a command from a controller. The motor driver includes: a correction command output part that outputs a correction command for correcting a position of the motor based on a position of the object detected by a displacement sensor that detects the position of the object; and a position controller that outputs a drive signal for driving the motor based on the command from the controller and the position of the motor detected by an encoder that detects the position of the motor, or based on the correction command and the position of the motor detected by the encoder.