Introduction to Three Common Control Modes of Servo Motors and Their Common Aplications
This article mainly introduces the characteristics of the three control modes of AC servo motors and their applicable working conditions.
The three control modes are: position mode, torque mode, and speed mode.
Position Mode
Position mode is usually selected under working conditions with high position requirements. The host computer controls the servo motor by sending pulses and direction signals to achieve precise positioning and forward and reverse rotation operations. This is the most common form of control.
In this mode, how does the PLC control the servo motor? The T6/A6 series pulse version can determine the rotation speed by the pulse frequency sent, and the rotation angle by the number of pulses sent. At the same time, the T6/A6 series can also directly assign speed and displacement through MODBUS communication.
Common applications: Since the position mode has very strict control over speed and position, it is generally used in devices that require precise positioning, such as the linear module mentioned above, CNC machine tools, printing machinery, etc.
Torque Mode
Generally speaking, the torque mode is suitable for occasions where there are no special requirements for the speed and position of the motor, so that only a constant torque needs to be output. Unlike the position mode, the torque control method sets the output torque of the motor shaft through the input of external analog quantity or direct assignment of the address.
Assume that the motor output torque is 2.5Nm. At this time, if the motor shaft load is less than 2.5Nm, the motor will rotate in the set direction; when the load is greater than 2.5Nm, the motor will reverse in the set direction; when the load is equal to 2.5Nm, the motor will stop rotating.
Common applications: This mode is generally used in winding and unwinding devices that have strict requirements on the material's force. For example, in a winding device or fiber pulling equipment, the torque setting should be changed according to the change of the winding radius to ensure that the material's force does not change with the change of the winding radius.
Speed Mode
In speed mode, the servo system itself cannot do positioning. If you want to achieve the positioning function, you need to feed back the motor position signal or the load position signal to the host computer, and then the host computer will perform calculation control.
Common application scenarios: uniform speed control of conveyor belts. Smooth transmission of components on automated assembly lines.
The three control modes are: position mode, torque mode, and speed mode.
Position Mode
Position mode is usually selected under working conditions with high position requirements. The host computer controls the servo motor by sending pulses and direction signals to achieve precise positioning and forward and reverse rotation operations. This is the most common form of control.
In this mode, how does the PLC control the servo motor? The T6/A6 series pulse version can determine the rotation speed by the pulse frequency sent, and the rotation angle by the number of pulses sent. At the same time, the T6/A6 series can also directly assign speed and displacement through MODBUS communication.
Common applications: Since the position mode has very strict control over speed and position, it is generally used in devices that require precise positioning, such as the linear module mentioned above, CNC machine tools, printing machinery, etc.
Torque Mode
Generally speaking, the torque mode is suitable for occasions where there are no special requirements for the speed and position of the motor, so that only a constant torque needs to be output. Unlike the position mode, the torque control method sets the output torque of the motor shaft through the input of external analog quantity or direct assignment of the address.
Assume that the motor output torque is 2.5Nm. At this time, if the motor shaft load is less than 2.5Nm, the motor will rotate in the set direction; when the load is greater than 2.5Nm, the motor will reverse in the set direction; when the load is equal to 2.5Nm, the motor will stop rotating.
Common applications: This mode is generally used in winding and unwinding devices that have strict requirements on the material's force. For example, in a winding device or fiber pulling equipment, the torque setting should be changed according to the change of the winding radius to ensure that the material's force does not change with the change of the winding radius.
Speed Mode
In speed mode, the servo system itself cannot do positioning. If you want to achieve the positioning function, you need to feed back the motor position signal or the load position signal to the host computer, and then the host computer will perform calculation control.
Common application scenarios: uniform speed control of conveyor belts. Smooth transmission of components on automated assembly lines.
Updated on: 26/12/2024
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