RPM multiplier or increaser gear box 2

[Dhananjay Waghmare]

Dear All,
I am searching for a gear train or any type of gear box to multiply the rpm.
Input rpm = 30 and Required output rpm should be 3000. Increase 10 times (atleast).
I am having a limitation of input torque which is not so high.
I am thinking of a prototype of planetary gear used in Wind Turbine.
I am not sure where the input shaft is connected, to the Ring Gear or the Sun gear or the planet gear carrier.
Please guide me.
Regards

 

[BrianE22]

Why a planetary? Do you have 3 input/outputs?

 

[3DDave]

30 to 3000 is 1:100

The input torque is going to be at least 100 times what the output torque is. Even 1:10 steps are tough to manage.

You can buy a 100:1 reducer for a couple of dollars and run it backwards but it will only handle a very small amount of power.

If you look at the equations for planetary drives or what a reversed reducer is driven by it will clarify the situation better than anyone can tell you.

 

[Dhananjay Waghmare]

Thanks for your replies / suggestions!
I require only one input and one output. No multiple inputs / outputs.
Actually, I have tried to calculate the ratios with a reduction gear box but it will require a very high starting torque according to me. As I have specified earlier, I have a small starting torque.
Let's see if anyone has any solution or else I will have to drop the idea.
Regards

 

[BrianPetersen]

With such a huge speed-increaser ratio, it does not take much friction on the high-speed side to make it impossible to overcome.

A quick google search indicates that wind turbine gearboxes (in a speed-increaser configuration) are available - but they're designed for big applications. You are saying you have a "limitation of input torque which is not so high". What is "not so high"? Big wind turbines, let's say a megawatt or two, which is what these are designed for, have PLENTY of input torque.

In a speed-increaser configuration, the input could be the ring gear with the planet carrier held, or it could be the planet carrier with the ring gear held. Given that the sun gear is small compared to the ring gear, the difference will be some change in overall drive ratio, and the output going in the opposite direction versus the same direction. You will get the biggest speed-increase factor for a given tooth-count configuration if the ring gear is held, the planet carrier is driven, and the sun gear is the output (which will be in the same direction as the input).

These gearboxes are at least somewhat commercially available. What are you trying to do, that what's on the market doesn't do already?

 

[LittleInch]

If starting is your issue then why not couple a standard 3000 rpm motor to your output shaft to get it moving?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Dhananjay Waghmare]

I think I will try BrianPeterson's suggestions first. Let's hope for the best.
Thanks everyone.
I really appreciate this forum. So quick and concerned responses from all.

 

[waross]

With 30 RPM to 3000 RPM your output torque under perfect conditions will be 30/3000 or 1/100 (1%) of the input torque.
With limited input torque there is a real possibility that any sticktion in the gear train and you won't be able to start.

I will have to drop the idea.

That's a great idea.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[mfgenggear]

With 30 RPM to 3000 RPM your output torque under perfect conditions will be 30/3000 or 1/100 (1%) of the input torque.
With limited input torque there is a real possibility that any sticktion in the gear train and you won't be able to start.

I was thinking the same did not know to explain it

Torque will be an issue, lack of that is.
also as explained earlier changing to a bigger faster motor is obvious. spend $$$ and get it right.
to increase torque it would need a reducer, lower rpm, increase rpm, and the torque is reduced,

 

[waross]

Dhananjay Waghmare;
It would help a lot if you told us the source of your torque, and the load that you want to drive.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[Dhananjay Waghmare]

Thank you so much for your suggestions.
I will get back to you all with more details on the concept and all the earlier suggestions.
Regards