Servo System
The Role of Servo System in Laser Welding
- Precisely locate and control welding position through servo control
- Dynamically track welding trajectory
- Stable adjustment of welding speed
- Real-time feedback, minimal error
- Improve welding quality and production efficiency
What is Servo System?
The servo system mainly consists of a driver, a motor, and a feedback device. Its working principle is rooted in servo system theory: the controller sends a command, the driver amplifies and converts the control signal to drive the motor. Meanwhile, the feedback device provides real-time feedback, and the driver adjusts the motor’s operation according to the deviation, thus achieving high-precision closed-loop control.
The performance characteristics of the servo motor, the core actuator of the servo system, are particularly critical. In the field of industrial automation, servo motors are often used as alternative power drive solutions along with stepper motors.
Servo Motor VS Stepper Motor
| Comparison Dimension | Servo Motor | Stepper Motor |
|---|---|---|
| Control Method | Closed-loop control (requires encoder feedback) | Open-loop control (no feedback needed) |
| Precision | High precision (no cumulative error, positioning error at ±0.01mm level) | Moderate precision (depends on step angle, with cumulative error) |
| Speed Characteristics | Fast high-speed response, wide speed regulation range (0 – 5000+ rpm) | Smooth at low speeds, prone to step loss at high speeds (typically <2000 rpm) |
| Overload Capacity | Strong (can withstand 3–5× rated load for short-term overload) | Weak (prone to stalling under overload; requires strict load matching) |
| Feedback Mechanism | Encoder standard configuration (real-time feedback on position/speed) | No feedback (encoders optional for some high-end models) |
| Cost | High (complete system including driver, motor, and encoder) | Low (simple system structure, no feedback components needed) |
Advantages of Servo Systems
High precision Control
The feedback device monitors the system in real time, resulting in extremely small repeated positioning errors, which fully meets the requirements of precision machining.
Flexible and Adjustable
Parameters can be set as required, enabling the system to adapt to different loads and application scenarios, and achieve customized control.
More About Servo Motor
- Types of Servo Motor
- Servo system block diagram
Common types of servo motor include AC servo motors , DC servo motors , positional rotation and continuous rotation.
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- AC servo motors use alternating current, boasting high efficiency and speed regulation for industrial automation.
- DC servo motors rely on direct current, with simple circuits and low cost, suitable for office equipment.
- Positional rotation servos precisely fix angles, common in RC models.
- Continuous rotation servos run continuously at variable speeds, ideal for robot wheels and conveyor control.
The servo system works via closed – loop control.
The input command signal sets the target for the output shaft. The motor drives the shaft through the gear system. The potentiometer senses the shaft’s actual position, sending feedback. The amplifier compares the command and feedback, generating an error signal to adjust the motor, ensuring the shaft reaches the desired position.
System integration is our strength
Many suppliers focus only on the laser source or the robot body, while we focus on complete system integration, including: laser source matching, servo system selection and tuning, coordination of the welding head and wire feeder, and parameter optimization. This ensures that our welding equipment operates efficiently and reliably in the long term.
Clarify the requirements:
(1) How high should the precision be?
(2) How heavy is the load?
(3) How fast is it?
(For instance, for small equipment, DC servo systems are selected; for large industrial scenarios, AC servo systems are chosen; and for low-cost positioning, stepper servo systems with feedback can be selected.)