cycloid gearboxes vs harmonic drive vs planetary

[ansyolitico]

Hi.
I have doubts about the following types of gearboxes
from what I understand
cycloid
backlash equal zero
High transmissible couples

harmonics
backlash zero
average pairs
reduced encumbrance compared to the other two
complicated to achieve

planetary
average pairs
backlash zero but with appropriate shortcomings(what? )
lower cost

but I do not see much difference between harmonics and cycloids (obviously leaving the principle of operation), while for planetariums I have always seen them use on the changes of cars or where a high performance and a error of positioning of some tenth degree

I would also like to ask which of these are mounted in modern working center with 4 or more axes (to understand the rotating bases or rotary hooks) and examples of applications if it is possible

 

[Calender]

hi better detail your doubts...anywhere. ..generally, the "cycloids" are better where efficiency requirements exceed those of backlash and undulations of the transmission ratio (in some sectors of robotics also happens this)...as well as to the transmission ratios I believe the Harmonic drives are still a span over the cycloid ...both the types of gearboxes are born to condense in little space great reduction relationships....as far as planetary is concerned there is a wide doubtful web ..however harmonic drives are categorized as "planetary"

 

[brn]

hi personally used only epicicloidali. as Harmonic and cyclo have said they also serve to have great reductions with high efficiency and very low encumbrance.
epicycloids (we speak only of those for axles not those for heavy industrial applications) are the most used in industry and machine tools, have play values between 1-15 arcmin (well under tenth grade) then some niche product comes below. They are usually coupled to a brushless motor.