Servo Motor Feedback Switching for Wide Speed Range Control
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Solution Overview
Problem
Servo motor drivers face challenges in precisely controlling servo motors across a wide speed range due to distortion of position signals at high speeds and low precision at low speeds when using either position sensing or sensorless position estimation feedback technologies, limiting their operational flexibility and efficiency.
Innovation Solution
A feedback switching device and method that dynamically switch between position sensing and sensorless position estimation feedback modes based on the servo motor's rotating speed, utilizing a current sensor, position sensor, position estimator, and feedback switching comparator to automatically select the appropriate feedback signal, ensuring accurate position information across varying speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensing feedback technology is used to build up the speed control architecture, then the servo motor driver can correctly receive position signal at low rotating speed, but the position signal will be distorted when the rotating speed is higher than a certain value
Solution Approach 1:
The patent implements dynamic switching between position sensing feedback and sensorless position estimation feedback based on the servo motor's rotating speed. The feedback mode is automatically adjusted according to speed conditions, allowing the system to maintain high measurement precision across the entire speed range by selecting the appropriate feedback method for each operating condition.
Solution Approach 2:
The patent changes the feedback mode parameter based on rotating speed conditions. At low speeds, position sensing feedback is used for high precision, while at high speeds, sensorless position estimation feedback is switched to avoid signal distortion. This parameter change enables the system to adapt to different speed conditions and maintain optimal performance.
2Speed
If sensorless position estimation feedback technology is used to build up the speed control architecture, then the servo motor can operate at high rotating speed, but the position signal is of low precision when the rotating speed is lower than a certain value
Solution Approach 1:
The patent implements dynamic switching between sensorless position estimation feedback and position sensing feedback based on the servo motor's rotating speed. The feedback mode is automatically adjusted according to speed conditions, allowing the system to maintain high measurement precision across the entire speed range by selecting the appropriate feedback method for each operating condition.
Solution Approach 2:
The patent changes the feedback mode parameter based on rotating speed conditions. At high speeds, sensorless position estimation feedback is used to handle the high-speed operation, while at low speeds, position sensing feedback is switched to ensure high precision. This parameter change enables the system to adapt to different speed conditions and maintain optimal performance.
3Device complexity
If a fixed speed control architecture is preset before servo motor operation, then the control architecture can be simple, but the speed control architecture cannot be flexibly changed in accordance with the rotating speed of the servo motor
Solution Approach 1:
The patent implements a dynamic feedback switching mechanism that automatically adjusts the feedback mode according to the servo motor's rotating speed. The system includes a rotating speed detection unit, a feedback mode determination unit, and a feedback signal generation unit that work together to select the appropriate feedback method (position sensing or sensorless position estimation) based on real-time speed conditions, thereby achieving flexible adaptation without excessive complexity.
Data Source
AI summary
A feedback switching device and a method allow a drive control loop for a servo motor to actively switch the feedback mode in accordance with the rotating speed of the servo motor. When the servo motor is under a high speed operation, a sensorless position estimation feedback technology is used as the feedback mode; on the other hand, when the servo motor is under a low speed operation, the switching mode is automatically switched to a position sensing feedback technology. Therefore, the development needs for multi-function, high performance and low cost in the field of the servo motor control are met, and the conventional problem is solved that, when being applied to a servo driving system having a wide speed range, the single use of the position sensing feedback technology or the sensorless position estimation feedback technology fails to satisfy the application for a wide speed range.