1. Torque control
The torque control method is to set the external output torque of the motor shaft through the input of the external analog quantity or the assignment of the direct address. The specific performance is that, for example, if 10V corresponds to 5Nm, when the external analog quantity is set to 5V, the motor shaft is The output is 2.5Nm:
If the motor shaft load is lower than 2.5Nm, the motor rotates forward, when the external load is equal to 2.5Nm, the motor does not rotate, and when the external load is greater than 2.5Nm, the motor rotates in reverse (usually in the case of a gravitational load). The set torque can be changed by changing the setting of the analog quantity in real time, or the value of the corresponding address can be changed through communication.
The application is mainly used in winding and unwinding devices that have strict requirements on the force of the material, such as wire wrapping devices or optical fiber pulling equipment. The torque setting should be changed at any time according to the change of the winding radius to ensure that the force of the material is not affected. will change with the winding radius.
2. Position control
In the position control mode, the rotation speed is generally determined by the frequency of externally input pulses, and the rotation angle is determined by the number of pulses. Some servos can directly assign speed and displacement through communication. Since the position mode can have very strict control on the speed and position, it is generally used in positioning devices.
Application areas such as CNC machine tools, printing machinery and so on.
3. Speed Mode
The rotation speed can be controlled by the input of analog quantity or the frequency of the pulse. The speed mode can also be used for positioning in the outer loop PID control with the host control device, but the position signal of the motor or the position signal of the direct load must be sent to the host. Feedback for operational use.
The position mode also supports the direct load outer loop to detect the position signal. At this time, the encoder at the motor shaft end only detects the motor speed, and the position signal is provided by the direct final load end detection device. The advantage of this is that it can reduce the intermediate transmission process. The error increases the positioning accuracy of the entire system.