Servo controllers can sense changes in external loads, because servo controllers are usually equipped with various sensors and detectors that monitor the status and changes of external loads and thus adjust their control strategies and outputs. Here are some reasons and explanations:
1. External load change: The change of external load may cause the servo controller to need to adjust its output to maintain the stable operation of the motor.
For example, when the external load increases, the motor needs to output more torque to overcome the resistance caused by the increased load, at which point the servo controller will detect the change in load through the sensor and adjust the output torque of the motor accordingly.
2. Position detection: The servo controller usually needs to accurately control the position and speed of the motor. Through encoders or other position detection devices, the servo controller can monitor the real-time position of the motor and adjust the speed and position control accuracy of the motor according to changes in external load.
3. Current detection: The servo controller can monitor the real-time current of the motor through the current sensor, so as to judge the load of the motor.
When the external load increases, the motor current will increase, and the servo controller will adjust the output torque and speed of the motor according to the change of current to ensure the stable operation of the motor.
4. Protection function: The servo controller has functions such as overload protection and overcurrent protection, and the realization of these protection functions needs to rely on the monitoring of external load changes. When the external load exceeds the set threshold, the servo controller adjusts the output of the motor or takes other protective measures to protect the motor and mechanical system from overload.
Thus, the servo controller can sense changes in the external load and control and protect according to these changes. This is essential to ensure the stable operation of industrial automation systems, avoid the risk of accidents and extend the service life of equipment.