Introduction to Planetary Gearmotors
●These gearheads are sometimes called “epicycloidal” gearheads because the points on the rotating planets trace epicycloidal curves as they turn. The term “planetary” is also applicable because the rotating action of the entire assembly around the central sun gear mimics the movement of a solar system. Planetary gear trains are being used increasingly as actuators in applications where more torque is required from a smaller drive train package. Planetary gear trains are also used for differential systems and applications where very low reduction ratios are required. The input, output and auxiliary shafts can be connected to any of the three stages to achieve the speed/torque requirements of the application.
▲Construction of a Typical Planetary Gearhead
●A planetary gearhead is comprised of a sun gear, a ring gear, and a planet carrier assembly that uses three to five planet gears. The sun gear is generally the motor pinion, and the ring gear is generally in the housing. The planet carrier is usually a stamped or cast plate with a number of studs attached on which the planets revolve. The planet gears share the load, revolving around the sun gear. The output shaft is generally attached to the planet carrier of the output stage. Lubrication is usually a thick, sticky grease.
▲Calculating Planetary Gear Ratio
●In most planetary gearmotors the sun gear is the input, the planet carrier is the output, and the ring gear is kept stationary. However the sun, carrier and ring can be the input, the output or can be held stationary. Which piece rotates determines the gear ratio and whether the gear set is a speed reducer or an increaser and in which direction the output turns.
|
|
|
|
Application note & Design Guide |
|
|
|
|
Please see the document for details |
|
|
|
|
|
|
|
|
|
|
|
English Chinese Chinese and English Japanese |
|
|
2020/9/4 |
|
|
|
|
|
07470051.A |
|
|
136 KB |
- +1 Like
- Add to Favorites
Recommend
All reproduced articles on this site are for the purpose of conveying more information and clearly indicate the source. If media or individuals who do not want to be reproduced can contact us, which will be deleted.
Integrated Circuits
Discrete Components
Connectors & Structural Components
Assembly UnitModules & Accessories
Power Supplies & Power Modules
Electronic Materials
Instrumentation & Test Kit
Electrical Tools & Materials
Mechatronics
Processing & Customization
