Rotation Angle Detection Using Dual Sensors
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Solution Overview
Problem
Traditional methods for detecting the rotation angle of a servo's output shaft are inaccurate due to the inherent errors of the angle sensors used, which complicates precise control of the rotation angle.
Innovation Solution
A method and device that utilize two angle sensors, one on the motor shaft and one on the output shaft, to calculate an estimated rotation angle of the motor shaft, determine the actual range of the rotation angle, and select the correct rotation angle based on the relative relationship between the first and estimated angles, thereby reducing the influence of sensor errors and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an angle sensor is directly mounted on the output shaft to detect rotation angle, then the detection structure is simple, but the measurement precision deteriorates due to sensor errors
Solution Approach 1:
The patent divides the detection system into two independent parts: a first angle sensor on the motor shaft and a second angle sensor on the output shaft. Each sensor detects angles independently, and their data are combined through calculation to achieve high-precision measurement, avoiding the direct mounting limitation
Solution Approach 2:
The patent introduces the motor shaft as an intermediary element in the detection system. By detecting the motor shaft angle through the first sensor and correlating it with the output shaft angle through the transmission ratio, the system achieves precise output shaft measurement without directly mounting a high-precision sensor on the output shaft
2Measurement precision
If two angle sensors are used (one on motor shaft, one on output shaft), then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The first angle sensor on the motor shaft serves dual purposes: it detects motor shaft position for motor control and provides data for calculating output shaft angle through the transmission ratio, making the sensor system more efficient and reducing the need for additional components
Solution Approach 2:
The system uses feedback from both angle sensors to continuously calculate and update the output shaft rotation angle. The control system receives feedback from the second sensor directly and indirectly through the first sensor's data processed with the transmission ratio, enabling real-time precise control
Data Source
AI summary
The present invention provides a rotation angle detection method and device thereof. The method includes calculating an estimated value of a rotation angle of a motor shaft during rotation according to a second rotation angle; determining an actual range of the rotation angle according to the estimated value of the rotation angle and a detection error of the second angle sensor; determining optional values of the rotation angle based on a relative relationship between a first rotation angle and the estimated value; determining an actual rotation angle of the motor shaft, based on a value falling within the actual range of the rotation angle among the optional values, and determining an actual rotation angle of the output shaft according to the actual rotation angle of the motor shaft. The present invention can improve the measurement accuracy of the rotation angles of the output shaft of the rotating mechanism.