1, Different principles
The principle of a harmonic drive is to convert the rotation of the input shaft into the vibration of the output shaft through the theory of harmonic vibration, thereby achieving the purpose of deceleration. The harmonic drive has high transmission accuracy and low noise, but its structure is complex and maintenance cost is high.
The principle of a planetary gearbox is to convert the rotation of the input shaft into the rotation of the output shaft through planetary gear transmission. The planetary reducer has a simple structure and large load-bearing capacity, but its transmission accuracy is low and the noise is high.
2, Different characteristics
The harmonic drive adopts the theory of harmonic vibration, which converts the rotation of the input shaft into the vibration of the output shaft to achieve the purpose of deceleration. This type of reducer has the characteristics of high transmission accuracy, low noise, and strong reliability, and is widely used in fields such as mechanical manufacturing, aerospace, and automation control.
The planetary gearbox adopts the principle of planetary gear transmission, which converts the rotation of the input shaft into the rotation of the output shaft through the combination of planetary gears, sun gears, and internal gears. Planetary reducers have the advantages of simple structure, large load-bearing capacity, and long service life, and are widely used in industries such as machine tools, metallurgy, and mining.
3, Different uses
Harmonic reducers are mainly used in situations that require high precision, low noise, and high reliability, such as robots, CNC machine tools, semiconductor equipment, etc. The transmission accuracy of this reducer can reach 0.01mm, and the noise is less than 60 decibels, making it suitable for situations with high requirements for transmission accuracy and noise.
Planetary reducers are more suitable for situations with large load-bearing capacity and long service life, such as heavy-duty machine tools, lifting machinery, cement production lines, etc. The carrying capacity of planetary reducers can reach 100000 Newton meters, and their lifespan is generally over 5 years, making them suitable for situations with high requirements for carrying capacity and lifespan.
4. Different accuracies
The harmonic drive adopts flexible gear transmission, which can achieve very high transmission accuracy. For example, the precision of the Harmonic Drive reducer can reach ± 1 arcsecond, while also achieving precise rotational motion. This is something that planetary reducers cannot achieve. However, the accuracy advantage of harmonic reducers also has some limitations, and other factors such as temperature, load, and working conditions need to be considered.
The transmission accuracy of planetary gearboxes depends on factors such as gear size, manufacturing technology, and materials. Usually, the transmission accuracy of planetary reducers can reach ± 5 arcseconds. The accurate manufacturing of planetary gears makes planetary gear transmission more reliable, and due to the compact structure of the reducer, it can obtain a very large output torque.