Homing Sensor Timing Correction for Motor Position Control
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Solution Overview
Problem
Conventional motor control systems require expensive encoders or complex correction algorithms to achieve precise position control, as they struggle with minimizing control errors due to homing-signal generation time differences that vary with the direction and speed of the rotatable object.
Innovation Solution
A method that corrects the homing-signal generation time by calculating the time difference between first and second homing signals based on the direction and speed of the detection object, allowing for precise position control without the need for expensive encoders or complex algorithms, using the equation Tpos=|Tpos1−Tpos4| to initialize the encoder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional encoder is used to achieve precise position control, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent replaces the expensive conventional encoder with a simple homing sensor that generates homing signals. This cheap sensor, combined with the correction algorithm, achieves the same position control precision without the high cost of traditional encoders.
Solution Approach 2:
The patent substitutes the mechanical encoder system with an optical/electronic homing sensor system. By using light-based detection and software correction instead of mechanical encoding, the system achieves precise position control with lower-cost components.
2Measurement precision
If a conventional encoder is used to minimize control error, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the complex encoder system with a simple homing sensor. The sensor itself is simple, and the complexity is shifted to a software correction algorithm that processes homing signals to achieve precise position control.
Solution Approach 2:
The patent replaces the mechanical encoder system with an electronic homing sensor system combined with software correction. This substitution reduces mechanical complexity while achieving the same control precision through electronic and computational means.
3Ease of operation
If homing-signal generation time is not corrected, then device operation is simple, but measurement precision deteriorates due to hysteresis and accumulated errors
Solution Approach 1:
The patent implements a feedback mechanism where the system measures the actual homing-signal generation time, compares it with the ideal time, and applies correction values to compensate for hysteresis and accumulated errors. This feedback loop maintains measurement precision while keeping the overall system operation simple.
Solution Approach 2:
The patent changes the timing parameters of homing signal generation based on detected hysteresis and accumulated errors. By adjusting these parameters dynamically, the system corrects measurement inaccuracies without complicating the basic operation.
4Measurement precision
If homing-signal generation time is corrected using direction and speed variations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes timing parameters based on detected direction and speed variations. By adjusting homing-signal generation time according to these parameters, the system corrects measurement precision without requiring complex algorithms, simply varying timing based on observable conditions.
Data Source
AI summary
A method of correcting a sensor that detects a detection object and generates a detection signal includes: determining a homing-signal generation time difference between points of time when the detection signal is generated according to a direction in which the detection object enters the sensor and correcting a homing-signal generation time by using the determined homing-signal generation time difference.