Motor Encoder Threshold Adjustment for Aging Signal Drift
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Solution Overview
Problem
Conventional encoders face difficulties in readjusting the threshold value for optimal comparison with analog signals, especially due to aging deterioration, which affects the accuracy of position detection and increases tact time.
Innovation Solution
An encoder system with a voltage generation circuit, comparator, resistance value variation circuit, and threshold value determination circuit, where the resistance value of a variable resistor is adjusted to dynamically set and adjust the threshold value based on the relationship between the resistance value and comparator outputs, enabling automatic readjustment of the threshold value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold value adjustment is performed before shipment, then position detection accuracy is improved, but tact time increases and readjustment after shipment becomes difficult
Solution Approach 1:
The encoder automatically adjusts its own threshold value using the resistance value variation circuit and threshold value determination circuit, eliminating the need for manual pre-shipment adjustment and enabling self-readjustment after shipment when signal levels change due to aging
Solution Approach 2:
The threshold value is made dynamically adjustable through the resistance value variation circuit that can change the resistance value of the variable resistor, allowing the threshold to adapt to changing signal conditions both before and after shipment
2Device complexity
If threshold value is fixed after pre-shipment adjustment, then device complexity is reduced, but adaptability to signal level changes due to aging deteriorates
Solution Approach 1:
The threshold value determination circuit receives feedback from the comparator output and resistance value information, automatically determining the optimal threshold value based on actual signal conditions, enabling the system to adapt to aging-induced signal level changes without increasing overall device complexity
Solution Approach 2:
The resistance value of the variable resistor is changed to adjust the threshold value, allowing the encoder to adapt to signal level variations over time through parameter modification rather than structural complexity
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
This solution allows for automatic adjustment of the threshold value, eliminating the need for pre-shipment adjustments, reducing tact time, and maintaining accurate comparator outputs even when analog signal levels change due to aging deterioration.
Implementation Method 1
a voltage generation circuit connected to a power supply through a diode and having a variable resistor, the voltage generation circuit outputting a voltage corresponding to a current flowing through the diode and a resistance value of the variable resistor, as a threshold value
Data Source
AI summary
An encoder according to an embodiment of this disclosure includes a voltage generation circuit connected to a power supply through a diode and having a variable resistor, the voltage generation circuit outputting a voltage corresponding to a current flowing through the diode and a resistance value of the variable resistor, as a threshold value; a comparator for performing a comparison between an analog signal inputted from a detector for detecting rotation of a motor and the threshold value inputted from the voltage generation circuit, and outputting a comparison result as a comparator output; a resistance value variation circuit for varying the resistance value of the variable resistor; and a threshold value determination circuit for determining the threshold value based on a relationship between the resistance value and the comparator output.