YASKAWA ELECTRIC (THAILAND) CO., LTD.

What is a Servo Motor｜Fundamentals of Precision Control Systems in Automated Factories

A servo motor is a motor with an integrated control system. It uses feedback to precisely track position, speed, and torque. It is suitable for industrial applications requiring precision and stability in movement.
1. What is a Servo Motor?
A servo motor is a motor designed to precisely control position, speed, and torque. It uses the principle of feedback via sensors, such as an Encoder, to adjust values in real-time according to received commands.
Commonly used in:
- Industrial robots
- Conveyor systems
- Packaging machines
- NC machines
- Automatic inspection systems
2. Basic Components
- Motor Body: Often a brushless AC motor.
- Encoder: Measures position and speed (Absolute or Incremental type).
- Servo Amplifier (Amp/Driver): Receives commands from the controller and manages power supply.
All three parts work together to achieve precise and continuous control.
3. Control Modes
Servo motors can operate in several modes:
- Position Control: Precise position movement, suitable for robot arms.
- Speed Control: Maintains speed even with changing loads.
- Torque Control: Controls torque, such as in screw tightening applications.
Modes can be selected and switched according to factory application requirements.
4. Advantages and Considerations
Advantages:
- Micro-level precise control.
- Stable even with variable loads.
- Fast response, supports high-speed motion applications.
Considerations:
- Complex system, requires correct setup.
- If used for overly simple tasks, it might be overkill, leading to unnecessary high costs.
Should be chosen appropriately to ensure the automation system is cost-effective and achieves maximum efficiency.
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What is a Servo Motor｜Fundamentals of Precision Control Systems in Automated Factories

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