Requirements for servo drive systems:
1. Wide-range speed regulation
2. High-precision positioning
3. Good transmission rigidity and high-speed stability
4. Fast response with no overshoot
In order to ensure quality and productivity, in addition to the requirement of high positioning accuracy, a high response speed is also required. Therefore, during the start-up, braking and acceleration processes, the CNC system's acceleration and deceleration are large enough to shorten the changeover time of the conveyor system and reduce the shape error during the changeover.
5. Low-speed, high-torque, and high-load performance
Under normal circumstances, the overload capacity of the servo drive exceeds 1.5 times within a few minutes or half an hour, and can exceed 4-6 times in a short period.
6. High reliability
The feed drive of CNC machine tools must have high reliability, good operational stability, strong adaptability to environmental factors such as temperature, humidity, and vibration, and strong anti-interference ability.
Servo Driver Motor Characteristics
1. The motor can operate from high speed to high speed with minimal torque fluctuation, especially at low speeds (below 0.1 RPM), maintaining good speed without creep.
2. The motor requires significant overload over extended periods to meet the demands of low-speed, high-torque operation. Ordinary DC servo motors require 4-6 overload cycles to achieve fault-free operation within minutes.
3. To achieve rapid response, the motor's moment of inertia, resistance torque, time constant, and starting voltage should be minimized.
4. The motor should be able to withstand frequent starting, braking, and reversing.
Servo Driver Parameters
Proportional Increase
1. Sets the proportional gain of the position loop regulator;
2. Under the same command pulse frequency, a larger setting value results in higher gain, greater rigidity, and less position lag. However, if the value is too large, it will cause vibration or overshoot.
3. This parameter value depends on the specific servo system model and load.
Servo Driver Position Forward Gain
1. Sets the feedforward gain for the positioning loop;
2. At any command pulse frequency, a larger setting value results in less position delay;
3. A large forward gain in the position loop can improve the system's high-speed response performance, but it can lead to positioning instability and vibration;
4. When high response characteristics are not required, this parameter is generally set to 0 to represent the range of 0 to 100%.
Servo Driver Speed Proportional Increase
1. Set the proportional gain of the regulator;
2. A higher setting value results in higher gain and higher rigidity. The parameter value is determined by the specific servo system model and load value. Generally, a larger setting value is used when the load inertia is large;
3. Maximize the value without causing system vibration.
Servo Driver Time Constant Integral
1. Set the integral time constant of the regulator;
2. A lower setting value results in faster integration. The parameter value is determined by the specific servo system model and load. Generally, a larger setting value is used when the load inertia is large;
3. Minimize the value without causing system vibration.
Servo Driver Speed Feedback Filtering Coefficient
1. Set the low-pass filter for rotational speed feedback;
2. A larger value results in a lower shutdown frequency and less noise generated by the motor. The setting value can be appropriately reduced when the load inertia is large. 3. If the value is too high, the response speed will slow down, leading to vibration.
4. The lower the value, the higher the shut-off frequency, and the better the speed response. When a higher response rate is required, the set value can be appropriately reduced.
Servo Driver Maximum Output Torque Setting
1. Set the internal torque limit value of the servo motor.
2. Set as a percentage of the rated torque.
3. This limit ensures effective positioning of the well completion area at all times.
4. The pulse range is determined by the set position control mode.
5. This parameter serves as the basis for the operator to determine whether positioning has been completed in position control mode. If the remaining pulse count in the position offset counter is less than or equal to the value set by this parameter, the driver will determine that positioning is complete, and the position switching signal will be "on"; otherwise, it will be "off".
6. In position control mode, the position and speed of the entire signal are constant;
7. The setting value represents the motor's acceleration time as 0 to 2000 rpm, or 2000 to 0 rpm;
8. Acceleration and deceleration are both achievable linear speeds;
9. Set arrival rate;
10. In non-position control mode, when the motor's rotational speed exceeds the setting, the speed arrival switching signal is ON, and vice versa;
11. This parameter is not used in position control mode;
12. Rotation direction is independent.