RPM vs Torque, I, Mech HP, Eff, and Fp of an Induction Motor

[coltfourfive]

I need to create graphs of:

3 Phase Torque vs RPM
Current vs RPM
Mechanical Power (HP) vs RPM
Efficiency vs RPM
Power Factor vs RPM

for Slip between nearly 0 and 1 for a 5HP, 60 hz, 440Vac, 4 pole, 3 phase induction motor.

I'm having trouble finding equations online relating relating these values. Can anyone give me a pointer in the right direction as to what equations I need to start with?

Thanks

 

[JOmega]

Try to google for the equvivalent circuit for induction motor. There you will have all the equations you need, presuming you have the values for the motor impedances.

 

[jim hardy]

see if this link is any help

http://books.google.com/books?id=ff...esnum=7&ved=0CEUQ6AEwBjgK#v=onepage&q&f=false

there's no one minute answer. The size and shape of the rotor bars is designed to give the desired speed-torque curve. There are four basic curve shapes A through D depending on the nature of the load to be driven. Starting torque and pull out torque are main points of interest.

Try google 'motor curve images ' and a quadratic curve fit to one that looks appealing.