does any one know , what the formula or equation or maybe table to convert HP to shaft rotor diameter

for example if i have 100 HP motor what is the size of the rotor shaft diameter.

please write me soon

 

Responding to erik's Sun, May 30, 12:16pm query:

If you are unable to obtain information from a motor manufacturer's data sheets, then I suggest you use the following reference:

Baumeister and Marks, "Standard Handbook for Mechanical Engineers" Publisher, Mcgraw-Hill, USA.

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected]) {[email protected]}

 

Are you attempting to design a motor?

I don't think there is a formuale which expressly relates HP to shaft diameter. (not that I have seen one).

You can calculate Torque given in inch pounds-force =
HP*63025/motorRPM. The torque could then be used to determine an appropriate shaft size.

There is also a relationship between frame size and shaft diameter - given by NEMA, a Frame size of 143T typically will have a shaft diameter of 7/8" and a frame size of 324T will typically have a shaft diameter of 2 1/8".

I would probably talk to some motor anufactures, based upon the sites I looked at none had any relationship data - specific to calculations re: HP vs shaft diameter.

Check out these sites:

http://ecmweb.com/ar/electric_understanding_modern_motors/

http://www.nema.org/

There are so many considerations regarding selecting a suitable motor for a given application tha tunfortunately I don't feel you could do this by a single equation or even a given set of equations.

MJH

 

You will find the shaft diameter from the motor manufacture or from the NEMA MG1 standard. You will need to know the frame size which you can find on the motor nameplate.

 

There is an equation for that: HP=(Di*Di*Di*RPM)/(50*1.75) which Di is diameter of the shaft in inch. For instance for 2 inches shaft we will have 137 hp.

 

Responding to Matthew Hyatt's Wed, Jun 2, reply:

Although you haven't seen one there is a rather simple formula for calculating a suitable shaft diameter for a given HP.

If you are unable to access the reference text I noted earlier please contact me.

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected])