vane type air motor design 1

[peroni]

Hello all,
I apologize if I'm in the wrong forum but was not exactly sure which one to pick. I am trying to determine how an air motors rpm are determined if the pressure is constant. I require a compact motor that can run at 600 to 800 rpm. Can anyone help me with the theory behind my requirement.
I thank you all in advance for your time and look forward to a response
Peter

 

[MikeHalloran]

Pressure has less to do with an air motor's speed than do load and flow.

If you are designing a motor from scratch, you have a lot of reading, testing, and scrapping to do.

If you are starting to select someone else's motor, then you have to balance the envelope against the load, speed, and flow requirements. Perhaps a cataog or two would help you reduce the volume of the problem space.





Mike Halloran
Pembroke Pines, FL, USA

 

[Compositepro]

This will answer your questions:

http://www.gastmfg.com/catalogs/airmotorhbk.pdf

 

[peroni]

Mike,
Thank you for the information, do you have any suggestions on books. I don't plan on starting from scratch but mimic an existing motor that looks like one from an air drill.
I don't understand how the calculation between the size of the rotor and RPM work.
Thanks again

 

[peroni]

Compositepro
Thank you, will look over it and update
Peroni

 

[hydtools]

Generally, the displacement is chosen to create the torque required at the expected operating pressure. The speed of the motor is then the result of volume of air available at that pressure and the load imposed on the motor. But, that is just the beginning if you are going to design and build your own.

Ted

 

[peroni]

Hi Ted,
Thank you for your feed back.
I'm really just interested in the dimensions of a rotor that has 650 rpm and probably 3/4 hp.
I'm trying to figure out what is should look like but I'm most probably going to replicate an existing rotor to keep costs low.
Thanks
Peter

 

[MikeHalloran]

Because of the inherent tribological challenges, selection of materials is critical to air motor success. Even if you can duplicate the geometry, you are way less than halfway there.

Given that nobody reveals what specific materials they use, the sensible way to keep costs low is to just buy the motor you need.



Mike Halloran
Pembroke Pines, FL, USA

 

[hydtools]

http://m.hydraulicspneumatics.com/2...le/False/6422/TechZone-FluidPowerAcces?page=2

This article will give some clues as to design considerations for a vane motor.

Ted