Sensorless estimation of motor torque

The sensorless torque estimation and control system developed by the SuGong team is based on the acquisition of motor current, voltage, and speed data. On the control system’s touchscreen, the motor’s dynamic load torque is displayed in the form of bar graphs, trend curves, and numerical values. Based on the magnitude of the load torque and the trend of resistance to motion, the control system autonomously determines whether the motor is overloaded or jammed and then responds accordingly.

When the motor’s dynamic torque exceeds the overload threshold, the system can respond autonomously according to the user’s selection: issuing an alarm notification, performing an immediate shutdown, or initiating a countdown shutdown (the approach time for shutdown is correlated with the degree of overload).

When the motor shows a tendency to jam, the system will automatically shut down within 100 milliseconds.

The control system dynamically displays the motor’s rated current, dynamic current, overload status, and phase-loss status in the form of bar graphs and numerical values.

Once the motor enters a phase-loss condition, the system will automatically shut down within 50 milliseconds. If the motor’s current exceeds its rated current, the system can, according to the user’s preference, either trigger an automatic alarm or initiate a countdown shutdown (the approach time for shutdown is correlated with the degree of overcurrent).

The system automatically generates and stores graphs of the motor’s dynamic load torque and dynamic speed curves, which users can view and copy to analyze historical operating conditions and conduct research.