Planetary reducers are not self-locking!
The remarkable characteristic of worm gear reducers is that they have the function of reverse self-locking and can achieve a large reduction ratio. The input shaft and output shaft are neither on the same axis nor on the same plane. Generally speaking, however, this type of reducer has a large volume, low transmission efficiency and poor precision.
The transmission mechanism of planetary gear reducers is gears. Imagine that there are two concentric circles, one large and one small. In the annular area between these two circles, there are three other small circles. Of all the circles, the largest one is the internal gear ring, and the other four small circles are all gears. The one in the middle is called the sun gear, and the other three small circles are called planetary gears. When the servo motor drives the sun gear of the reducer to rotate, the sun gear then drives the planetary gears supported on the internal gear ring. The planetary gears drive the output shaft connected to the external gear ring through meshing transmission with the external gear ring, so as to achieve the purpose of deceleration.
Planetary reducers have many advantages, such as a relatively compact structure, small backlash, high precision, long service life, and a very large rated output torque. However, its price is slightly expensive.