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Difference between planetary reducer and servo motor

Planetary reducers and servo motors are two very important components in the fields of modern automation and mechanical transmission. They each have unique functions and application scenarios. Understanding the differences between them is crucial for selecting the right equipment to meet specific engineering needs. Here is a detailed introduction to the differences between planetary reducers and servo motors.

Planetary Reducers

A planetary reducer is a speed reduction device that works based on the principle of planetary gear transmission. It consists of basic components such as the sun gear, planet gears, inner gear ring, and planet carrier. The main features of planetary reducers include high transmission efficiency, compact size, smooth operation, and large reduction ratios. They are typically used to reduce the speed of high-speed motors and increase output torque, and are widely applied in fields such as robotics, automated production lines, and conveyor equipment.

The advantages of planetary reducers include:

  • High reduction ratio and torque output
  • Compact design, saving space
  • Low noise and vibration
  • Long lifespan and high reliability
  • Capable of withstanding heavy loads

Servo Motors

A servo motor is an automatic control device used for precise control of the position, speed, and acceleration of mechanical components. Servo motors usually include a motor and an encoder, capable of receiving control signals from the system and providing accurate feedback to achieve precise motion control. Servo motors are widely used in fields such as CNC machines, robotics, automated equipment, and precision positioning systems.

The main advantages of servo motors include:

  • High precision in position and speed control
  • Fast response and high dynamic performance
  • Low energy consumption and high efficiency
  • Precise adjustment and optimization can be done through software
  • Suitable for applications requiring precise control


The main differences between planetary reducers and servo motors lie in their functions and applications:

  1. Functionality: Planetary reducers are mainly used for speed reduction and increasing torque, while servo motors are used for precise control of mechanical motion.
  2. Control Method: Planetary reducers are usually used in conjunction with motors as speed reduction devices; servo motors integrate control functions and can directly receive control signals.
  3. Accuracy and Response: Servo motors provide high precision in position and speed control with fast response; planetary reducers focus more on torque output and reduction ratios.
  4. Structural Complexity: Servo motors have complex structures, including encoders and control circuits; planetary reducers have relatively simple structures, mainly composed of gears.
  5. Cost: The cost of planetary reducers is usually lower than that of servo motors, especially in applications that do not require high precision control.


When choosing between a planetary reducer or a servo motor, it is necessary to decide based on the specific application requirements. If the project requires high torque output and a large reduction ratio, a planetary reducer is a good choice. If the project demands precise position control and rapid response, a servo motor is the more suitable solution. Understanding these differences helps engineers and technicians select the most appropriate components for their projects to achieve optimal performance and efficiency.

Link: Fubao Mechanical >> Difference between planetary reducer and servo motor

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