Position Detection Encoder Synchronization via Speed-Based Delay
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Solution Overview
Problem
Existing linear encoders face challenges in synchronizing position detection times across multiple tracks, leading to positional errors when the detection head is moved relative to the scale, due to differing configurations of position detection circuits.
Innovation Solution
Incorporating speed detection means and delay means to provide a time difference in output request signals based on relative speed and position information, with computing means to determine a fine adjustment time that converges to zero, ensuring synchronized position detection times across tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If position detection circuits with different configurations are used for multiple tracks, then each track can be detected independently, but the position detection times on the tracks cannot be synchronized, leading to positional errors when the detection head moves
Solution Approach 1:
The system pre-calculates and stores time difference values between multiple tracks based on their detection circuit configurations. Before actual position detection, the controller retrieves these pre-calculated time differences and applies them as delay corrections to synchronize the detection timing across all tracks, eliminating positional errors caused by unsynchronized detection
Solution Approach 2:
The system continuously monitors the position detection results from multiple tracks and dynamically adjusts the delay time applied to each track's detection signal. By comparing the detected positions and calculating the actual time differences, the system feeds back correction values to the delay means, ensuring continuous synchronization even when detection head speed varies
2Productivity
If the detection head moves relative to the scale, then position information can be obtained dynamically, but unsynchronized detection times cause noticeable positional errors between tracks
Solution Approach 1:
Time difference values for synchronizing multiple tracks are pre-calculated based on the known configurations of the detection circuits and stored in memory. When dynamic position detection is performed, the controller automatically retrieves and applies these pre-calculated delay values to each track, ensuring synchronized detection without affecting detection speed or productivity
Solution Approach 2:
The system dynamically adjusts the delay time parameter applied to each track's detection signal based on the detection head's movement state. By changing the delay parameter in real-time according to the actual detection conditions, the system maintains synchronized detection timing while enabling high-speed dynamic measurement
3Device complexity
If no delay adjustment is applied, then the system structure remains simple, but positional errors occur between tracks during movement
Solution Approach 1:
A delay means is introduced as an intermediary component between the position detection circuits and the controller. This delay means receives detection signals from multiple tracks and applies precise time delays to each signal based on pre-calculated values, synchronizing the detection timing without requiring complex modifications to the detection circuits themselves
Solution Approach 2:
The system replaces complex mechanical synchronization mechanisms with electronic delay control. Instead of using mechanical devices to physically synchronize detection timing, the system uses electronic delay circuits and digital signal processing to achieve precise time synchronization, significantly reducing mechanical complexity while improving precision
Data Source
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AI summary
A position detection encoder includes a scale and a detection head and has position detection circuits which are capable of outputting respective pieces of position information on Xf, Xs two tracks. The displacement detection encoder includes: a speed detection circuit which is provided in the detection head and detects a relative speed Xf, Xs relative to the scale; and a delay generation circuit which provides a time difference between two output request signals, the time difference being provided on the basis of a fine adjustment time tadj based on the relative speed Xf, Xs and the respective pieces of position information Xf, Xs on the two tracks, the output request signals St1, St2 urging the first and second position detection circuits to output the pieces of position information on Xf, Xs the two tracks.