As far as I know, the main differences between DD motors and servo motors include:
1, control: DD motors are direct drive motors, which are directly connected to the load; servo motors accurately control the position, speed, and torque through a feedback control system.
2, precision: servo motors have high precision and provide constant speed and torque; DD motors have high torque density, low vibration and noise, and high positional accuracy.
3. Scope of application: DD motors are suitable for high-precision, low-vibration and high-torque-density applications such as robotics, medical equipment and high-end turntables; servo motors are suitable for automation industries, robotics, CNC machine tools and other precision control applications.
4, price and complexity: DD motors are more expensive, but maintenance costs may be reduced; servo systems have a lower initial investment, but require complex control strategies and maintenance.
5, size and efficiency: servo motor size is smaller, may be due to complex systems and transmission and loss of efficiency; DD motor may be larger, but more efficient, because there is no intermediate transmission.