1. Position mode
Look at this name, you can guess a rough idea, to put it bluntly, the position requirements are relatively high, such as the linear servo module this kind of mechanism, the need for the sliding mechanism to stop accurately, just use this mode, speaking of which, let's take a look at the composition of the ball screw module (Lao Zhang's purpose is: to use the limited fragmentation time, so that everyone can know more).
The basic application in automation is this mode, and in the position mode, the PLC generally controls the servo system by sending pulses to the drive.
In this mode, how does the PLC control the servo motor: the frequency of the sent pulse determines the rotation speed; The angle of rotation is determined by the number of pulses sent; Of course, there are also some servo systems, and the PLC can directly assign the speed and displacement through communication.
Because the position mode has a very strict control over the speed and position, it is generally used in devices that need precise positioning, such as linear modules like the above, as well as CNC machine tools, printing machinery, etc., it can be said that this mode is the most widely used.
2. Torque mode
Generally speaking, when applying the torque mode, there is no requirement for the speed and position of the motor, and only a constant torque needs to be output, just like the use condition I just had.
For example, in a servo system, if the torque corresponding to 10V is 5N·m, then when the external input analog is set to 5V, the motor output torque is 2.5N·m.
At this time, if the motor shaft load is less than 2.5N·m, the motor will rotate forward; When the load is greater than 2.5N·m, the motor will rotate in the direction of the load; Of course, when the load is equal to 2.5N·m, the motor will not rotate.
This control mode is not used very much, it is generally used in winding and unwinding devices that have strict requirements for the force of the material, such as the wire device or the optical fiber pulling equipment, and the setting of torque should be changed at any time according to the change of the winding radius to ensure that the force of the material will not change with the change of the winding radius.
3. Speed mode
In this mode, there are two ways to control the rotation speed of the servo motor:
1. The frequency at which the external pulse is sent to the driver
It is to control the rotation speed of the servo motor through the pulse frequency sent by the host computer (such as PLC), which is the same as the position mode.
2. Through the input of analog quantities
This method is similar to the torque mode, 0-10V corresponds to different speeds, and when the external input analog is set to different voltages, the servo motor will output the corresponding speed.
In the speed mode, the servo system itself can not do positioning, if you want to achieve the positioning function, you need to feed back the position signal of the motor or the position signal of the load to the host computer, and then the host computer for operation control, to put it bluntly: the position of the motor or load needs to be detected separately.
The position mode also supports the direct load outer loop to detect the position signal, in which the encoder at the shaft end of the motor only detects the motor speed, and the position signal is provided by the detection device at the final load end.
The advantage of this is that it can reduce the error in the intermediate transmission process and increase the positioning accuracy of the whole system.
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