The working modes of servo driver are: open loop mode, voltage mode, current mode (torque mode), IR compensation mode, Hall speed mode, encoder speed mode, tachometer mode, and analog position loop mode (ANP mode). (not all of the above modes exist in all models of drives)
The input command voltage controls the output load rate of the driver. This mode is used for brushless motor driver, and the voltage mode is the same as that of brush motor driver.
The input command voltage controls the output voltage of the driver. This mode is used for the brushless motor driver and is the same as the open-loop mode of the brushless motor driver.
The input command voltage controls the output current (torque) of the driver. The driver adjusts the load rate to maintain the command current value. If the servo driver can work in the speed or position loop, it usually contains this mode.
Input command to control motor speed. IR compensation mode can be used to control the speed of motor without speed feedback device. The driver will adjust the load rate to compensate for the change of output current. When the command response is linear, the accuracy of this mode is less than that of the closed-loop speed mode in the case of torque disturbance.
Input command voltage to control motor speed. This mode uses the frequency of Hall sensor on the motor to form a speed closed loop. Due to the low resolution of Hall sensor, this mode is not generally used for low-speed motion applications.
Input command voltage to control motor speed. This mode uses the frequency of encoder pulse on servo motor to form speed closed loop. Due to the high resolution of the encoder, this mode can be used for smooth motion control at various speeds.
Input command voltage to control motor speed. In this mode, the speed closed loop is formed by simulating the tachometer on the motor. Because the voltage of DC tachometer is analog continuous, this mode is suitable for high precision speed control. Of course, it is also vulnerable to interference at low speeds.
Input command voltage to control the rotation position of motor. This is actually a speed mode (such as adjustable potentiometer, transformer, etc.) that provides position feedback in the analog device. In this mode, the motor speed is proportional to the position error. It has faster response and smaller steady-state error.
03/13/2021
The working modes of servo driver are: open loop mode, voltage mode, current mode (torque mode), IR compensation mode, Hall speed mode, encoder speed mode, tachometer mode, and analog position loop mode (ANP mode). (not all of the above modes exist in all models of drives)
03/12/2021
The controller is usually a computer or PID control circuit, and its main task is to transform and process the deviation signal output by the comparison element, so as to control the executive element to act as required.
03/12/2021
1.Feedback compensation open loop control. The accuracy of open-loop system is low, because the step error , start stop error and mechanical system error of servo driver will directly affect the positioning accuracy. This system has the advantages of both open-loop and closed-loop, that is, it has the stability of open-loop and the accuracy of closed-loop.
03/10/2021
The "phase sequence" of power incoming line is incorrect. Due to the synchronization problem between the trigger pulse and the main circuit of SCR servo driver, there are strict requirements on the "phase sequence" of the input power supply. If the "phase sequence" is not correct, connecting the power supply may immediately cause the fuse of the main circuit of the driver to blow.
03/10/2021
The motor of servo driver is unstable, and the speed is fast and slow. The main reasons for this kind of fault are as follows: 1.The servo driver parameters are not adjusted properly, and the regulator does not reach the best working state.
03/09/2021
Position feedforward gain: set the feedforward gain of the positioning loop. The larger the set value is, the smaller the position delay isand the larger the feedforward gain of the position loop is, the high-speed response of the control system will rise, but the position of the system is unstable and prone to oscillation. When high response characteristics are not required, this parameter is usually set to 0, indicating the range of 0 ~ 100%.
03/07/2021
For signal line and encoder input line, please use shielded wire. Wiring length: the length of signal line from NC to AC servo driver is less than 3m, and the length of input line from AC driver to encoder is less than 20m. The ground wire should be thick wire as far as possible. According to the third grounding standard (grounding resistance < 100 Ω), one point grounding method should be adopted to connect the ground wire. If the motor and the machine tool are insulated, the motor should be grounded.
03/05/2021
Ambient temperature of servo driver. 1) Operating temperature: - 10 ℃ ~ + 40 ℃; (2) storage temperature: - 25 ℃ ~ + 65 ℃; (3) ambient humidity: 5% ~ 90%, no condensation; (4) vibration / shock: vibration is 0.5g (4.9M / S2), shock is 2G (19.6m / S2).
03/05/2021
As one of the importanttechnologies of CNC machine tools, industrial robots and other industrial machinery control, servo drive technology is widely concerned at home and abroad. In the last decade of the 20th century, the development of microprocessor (especially DSP), power electronics, network technology and control technology havelaid a good foundation for the further development of servo drive technology.
03/04/2021
Precision: the closed-loop control of position, speed and torque, and the problem of out of step of stepping motor is solved; Speed: high speed performance, general rated speed can reach 2000 ~ 3000 rpm;
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