Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Backdrivable reduction mechanism
- Thread starter medo79
- Start date
- Thread starter
- #4
- Thread starter
- #5
MikeHalloran
Mechanical
If you're intending to backdrive it all the time, you should call it a speed increaser rather than a reducer, so as to avoid confusion, and so that any potential suppliers better understand what you want to do.
Mike Halloran
Pembroke Pines, FL, USA
Mike Halloran
Pembroke Pines, FL, USA
- Thread starter
- #10
Is Harmonic drive is backdrivable? What about the resistance torque from output to input? Is the resistant torque small?
I will use it as speed reducer in a part of cycle and as backdrive in other part of the cycle. Where can I buy it with low price? I checked the price in , but the prices were very expensive.
I will use it as speed reducer in a part of cycle and as backdrive in other part of the cycle. Where can I buy it with low price? I checked the price in , but the prices were very expensive.
- Thread starter
- #11
medo79,
When you drive anything through a gearbox, the inertia of the load is multiplied by the square of the gear ratio. In your case, it is multiplied by 10,000. You will notice this.![[smile]](/data/assets/smilies/smile.gif "[smile] [smile]")
My understanding is that harmonic drive has a fixed friction torque. It is about 90% efficient at maximum torque. It is less efficient at lower torques.
Harmonic drive is not cheap. Rather than buy a packaged gear reducer, you might want to buy just the gearset, so that you can integrate it with your system. You can wind up with a really cool design.
If you want dirt cheap, buy some worm gears, and forget about backdriving and efficiency.
JHG
When you drive anything through a gearbox, the inertia of the load is multiplied by the square of the gear ratio. In your case, it is multiplied by 10,000. You will notice this.
My understanding is that harmonic drive has a fixed friction torque. It is about 90% efficient at maximum torque. It is less efficient at lower torques.
Harmonic drive is not cheap. Rather than buy a packaged gear reducer, you might want to buy just the gearset, so that you can integrate it with your system. You can wind up with a really cool design.
If you want dirt cheap, buy some worm gears, and forget about backdriving and efficiency.
- Thread starter
- #13
medo79 said:
What do you mean?
The output speed is an exact multiple of input speed, just the same as a gear drive. There is no backlash in a standard harmonic drive gear set, but there is a little bit of elastic wind-up.
The catalogues are very good. Read them.
- Thread starter
- #16
- Status
Similar threads
- Locked
- Question