1) The main feature of the worm gear reducer is that it has a reverse self-locking function and can have a larger reduction ratio. The input shaft and the output shaft are not on the same axis or on the same plane. But generally the volume is large, the transmission efficiency is not high, and the accuracy is not high.
2) The harmonic drive of the harmonic geared motor uses the controllable elastic deformation of the flexible element to transmit movement and power. The volume is small and the accuracy is high. However, the disadvantage is that the flexible wheel has a limited service life, is not resistant to impact, and is rigid and metal parts. Relatively bad. The input speed cannot be too high.
3) The advantages of planetary gear motors are compact structure, small return clearance, high precision, long service life, and large rated output torque. But the price is slightly more expensive. Geared motors are generally used in low-speed and high-torque transmission equipment. The motor, internal combustion engine or other high-speed running power is used to achieve the purpose of deceleration by meshing with the large gear on the output shaft through a gear with a small number of teeth on the input shaft of the reduction motor. The geared motor will also have several pairs of gears with the same principle to achieve the ideal deceleration effect. The ratio of the number of teeth of the large and small gears is the transmission ratio.