Servo motors are often used in automation equipment, especially for position control. Most of the brands of servo motor have position control function. The controller sends pulses to control the operation of the servo motor. The number of pulses corresponds to the angle of revolution and the frequency of pulses corresponds to the speed (related to the setting of the electronic gear). When the parameter can't work in a new system, first you should set the position gain of the CNC servo driver to ensure that the motor is noise-free, as far as possible to set some larger. Rotational inertia ratio is also very important, you can set by self-learning, and then set the speed gain and speed integration time to ensure that the continuous operation at low speed, the position accuracy can be controlled.
1. Ab servo driver position proportional gain
Sets the proportional gain of the position loop regulator. The higher the setting value is, the higher the gain is, the higher the stiffness is, and under the condition of the same frequency instruction pulse, the position lag is smaller. But setting the value too high can cause oscillation or overshoot. Parameter values are determined by the specific servo system model and load condition.
2. Ab servo driver position feedforward gain
Set the feedforward gain of the position loop. The higher the set value is, the smaller the position hysteresis and the larger the feedforward gain of the position loop under the instruction pulse of any frequency. The high-speed response characteristics of the control system are improved, but the position of the system is unstable and easy to oscillate. When high response characteristics are not required, this parameter is usually set to 0, which ranges from 0 to 100%.
3. Ab servo driver speed proportional gain
Set the proportional gain of the speed regulator. The higher the set value, the higher the gain, and the greater the stiffness. Parameter values are determined according to the specific servo drive system model and load value. In general, the greater the load inertia, the greater the set value. Under the condition that the system does not oscillate, you can set the value as large as possible.
4. Speed integral time constant of ab servo drive
Set the integral time constant of the speed regulator. The smaller the set value, the faster the integration. Parameter values are determined according to the specific servo drive system model and load condition. In general, the greater the load inertia, the greater the set value. In the system does not produce oscillation conditions, as small as possible.
5. Ab servo driver speed feedback filter factor
Set low speed feedback filter factor. The higher the value, the lower the cut-off frequency, the lower the noise generated by the motor. If the load inertia is large, the setting value can be appropriately reduced. If the value is set too high, the response will slow down, which may cause oscillations. If the value is set smaller, the cutoff frequency is higher, then the speed feedback response is faster. If a higher speed response is required, the set point can be appropriately reduced.
6. Setting the maximum output torque of the ab servo driver
Sets the internal torque limit of the ab servo drive. The setting value is a percentage of the rated torque. At any time, this limit is valid for the positioning completion range. This parameter provides the basis for the driver to judge whether the positioning has been completed under the position control mode. When the number of remaining pulses in the position deviation counter is less than or equal to the set value of this parameter, the ab servo driver will consider the positioning has been completed, and the signal of the position switch will be ON; otherwise, it will be OFF.