Control mode of servo motor

Torque control: the torque control mode is to set the external output torque of the motor shaft through the input of external analog quantity or the assignment of direct address. For example, if 10V corresponds to 5nm, when the external analog quantity is set to 5V, the output of the motor shaft is 2.5nm: if the load of the motor shaft is lower than 2.5nm, the motor will rotate forward, and when the external load is equal to 2.5nm, the motor will not rotate, When the torque is greater than 2.5nm, the motor reverses (usually under gravity load). The torque can be changed by changing the setting of analog quantity immediately, and the corresponding address value can also be changed by means of communication. It is mainly used in winding and unwinding devices with strict requirements on material stress, such as wire winding device or fiber pulling equipment. The setting of torque should be changed at any time according to the change of winding radius to ensure that the material stress will not change with the change of winding radius.
Position control: position control mode generally determines the rotation speed by the frequency of external input pulse, and determines the rotation angle by the number of pulses. Some servos can assign values to the speed and displacement directly by means of communication. Because position control mode can strictly control the speed and position, it is generally used in positioning devices.
3.Speed mode: the rotation speed can be controlled by the input of analog quantity or the frequency of pulse. The speed mode can also be positioned when there is the outer loop PID control of upper control device, but the position signal of motor or the position signal of direct load must be fed back to the upper position for calculation. The position mode also can detect the position signal by the direct load outer ring . At this time, the encoder at the motor shaft end only detects the motor speed, and the position signal is provided by the direct detection device at the final load end. The advantage of this mode 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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03/03/2021

Control mode of servo motor

Torque control: the torque control mode is to set the external output torque of the motor shaft through the input of external analog quantity or the assignment of direct address. For example, if 10V corresponds to 5nm, when the external analog quantity is set to 5V, the output of the motor shaft is 2.5nm: if the load of the motor shaft is lower than 2.5nm, the motor will rotate forward, and when the external load is equal to 2.5nm

03/03/2021

Voltage of servo motor: relationship between voltage and speed of servo motor

1)At high speed, the speed is proportional to the voltage 2) At low speed, the voltage is lower than the decrease of speed;

03/03/2021

Application of servo motor

Machine tool manufacturing - lathe, planer, grinder, machining center, gear making machine, milling machine, etc Automobile manufacturing - engine parts production line, vehicle assembly line, engine assembly line, body welding line, testing equipment, etc Casting manufacturing - manipulator, converter tilting, mold processing center, etc

03/02/2021

Advantages and disadvantages, function and service life of brushless motor

Advantage: (1) No brush, low interference When the brush is removed from the brushless motor, the most direct change is that there is no electric spark generated when the brushless motor is running, which greatly reduces the interference of electric spark to the remote control radio equipment.

03/02/2021

Advantages of hollow axis servo motor

The diameter of hollow shaft can reach 40mm Compact size IP65 protection level Low rotor moment of inertia, high dynamic response characteristics

03/02/2021

Information about ABB motor

ABB motor is a kind of electromagnetic device which realizes the conversion or transfer of electric energy according to the law of electromagnetic induction ABB servo motor is installed as follows:

03/02/2021

Connection between Arduino and servo motor

The connection of the servo motor using Arduino is as follows: Connect the black wires on the two servo motors to the GND on the Arduino Connect the red wires on the two servo motors to the 5V pin on the Arduino Connect the yellow wire on the first motor to pin 8 on the Arduino

03/02/2021

Related technical terms

1.Positioning or residual torque: when there is no current passing through the winding, the torque required to make the output shaft of the motor rotate. 2.Driver: an electrical control device used to run the stepping motor. This includes power supply, logic programmer, switching element and a variable frequency pulse source which determines the step rate. 3.Dynamic torque: the torque produced by the motor at a certain step rate. The dynamic torque can be expressed by PULL IN torque or PULL OUT torque.

03/01/2021

Matters needing attention

1.Oil and water protection of servo motor 1) The servo motor can be used in the place that will be attacked by water or oil drops, but it is not completely waterproof or oil-proof. Therefore, the servo motor should not be placed or used in the environment of water or oil invasion. 2) If the servo motor is connected to a reduction gear, the oil seal should be filled when using the servo motor to prevent the oil of the reduction gear from entering the servo motor 3) The cable of servo motor should not be immersed in oil or water.

03/01/2021

Performance comparison between servo motor and stepping motor

As an open-loop control system, stepping motor has essential connection with modern digital control technology. In the current domestic digital control system, stepping motor is widely used. With the emergence of all digital AC servo system, AC servo motor is more and more used in digital control system. In order to adapt to the development trend of digital control, stepping motor or full digital AC servo motor is mostly used as the executive motor in motion control system. Although they are similar in control mode (pulse train and direction signal), they are quite different in performance and application. This paper compares the performance of the two.

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Control mode of servo motor

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