Flywheel like design??

[rudyeb]

I have a small motor that spins at 20,000 RPM. I have attached a steel wheel that has a plastic rim and a steel tire. When I turn the motor on, there is a force that is acting against the motor that feels like it s a centrifugal force or something. What is the actual force known as?

Secondly, how does one determine the best wheel design, OD, ID Thickness to have this force be as much as possible with this motor?
Does a large OD with a small steel tire create greater force than a smaller OD with a larger steel tire?

I do hope I made some sense here and appreciate any input anyone may have.
Thank you,
Rudy

 

[JJPellin]

I don't understand what force you are referring to. Is it the torque reaction of the motor as the wheel is brought from rest up to full speed? Or, is it the gyroscopic effect once the motor is up to full speed and you attempt to move the motor by rotating it about any axis other than the axis of rotation of the shaft?

Johnny Pellin

 

[JohnRBaker]

Are you thinking of 'inertia'? Or 'momentum'?

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

To an Engineer, the glass is twice as big as it needs to be.

 

[TheTick]

Flywheels store energy, not force. Wrap your head around that and the rest of the design makes itself.

 

[rudyeb]

I think I am referring to the gyroscopic effect that is caused by the spinning of the wheel. As the motor gains RPM the force become greater. At startup, there is no force until there is a pretty good amount of speed. I want the gyro effect to be as great as possible utilizing this motor but don't know the best design to use with regards to the wheel. Perhaps it is inertia but I'm not sure of the proper nomenclature.
Thanks

 

[KllrWolf]

If you are after the gyroscope effect, high speed and high mass are the targets.

 

[JohnRBaker]

And get the mass as far from the axis of rotation as possible.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

To an Engineer, the glass is twice as big as it needs to be.

 

[drawoh]

And get the mass as far from the axis of rotation as possible.

And don't forget to analyse the thing for hoop stresses. 20krpm is pretty quick.

JHG

 

[SnTMan]

Maybe dig out the old Dynamics textbook. It's all in there...

Regards,

Mike

 

[dhengr]

Rudyeb:
What kind of Mechanical Engineering do you do? Have you taken a look at the posting rules on Eng-Tips? We don’t give college or tech. degrees in engineering here. Your’s are some pretty elementary questions, but not a simple problem in practice, and all the more complicated if you can’t use the correct terminology. Dig out your Dynamics, Strength of Materials, and Theory of Elasticity text books and get a little better handle on your problem. I don’t think you will get good results with a steel tire and a plastic rim and hub. How are you going to fit this to the motor shaft and what keeps things from flying apart at about 10000 rpm?

 

[tygerdawg]

20krpm is pretty quick.

Huh, yeah. Unless you have a high-speed spindle designed for such use, and with appropriate tool holders, and properly-balanced payload, you'll be getting a rude introduction to my friend "Mr. Bearing Failure." Tread lightly there, Sport.

TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering

http://www.bluetechnik.com

 

[kingnero]

I can vouch for those who haven't met tygerdawg's friend, he's a real party crasher at 20krpm!

 

[SnTMan]

rudyeb, are you after one of these?

http://en.wikipedia.org/wiki/Gyroscope

Regards,

Mike