induction motor and calculations

[[email protected]]

I am trying to learn and learn the basics of induction motors. So far
I have learned that there are single phase, three phase etc. Also, a
lot has to do with load and power. Just what exactly does load mean
and how do I calculate total power if I have 3 motors with 2hp, 20hp
AND 10hp respectively?

Thanks,
GN

 

[Kirk Johnson]

I am trying to learn and learn the basics of induction motors. So far
I have learned that there are single phase, three phase etc. Also, a
lot has to do with load and power. Just what exactly does load mean
and how do I calculate total power if I have 3 motors with 2hp, 20hp
AND 10hp respectively?

Thanks,
GN

Latex pants???

**Kirk Johnson**
**"Stretching It Wide Since '75"**
http://data.exet.nu/bildarkiv/goatse/goatse_03.jpg

 

[Rene Tschaggelar]

I am trying to learn and learn the basics of induction motors. So far
I have learned that there are single phase, three phase etc. Also, a
lot has to do with load and power. Just what exactly does load mean
and how do I calculate total power if I have 3 motors with 2hp, 20hp
AND 10hp respectively?

Well power is revolutions times torque.
A single pahse cannot deliver constant
torque, whereas a threephase can.
The rest are details.

Rene

 

[Trish]

I am trying to learn and learn the basics of induction motors. So far
I have learned that there are single phase, three phase etc. Also, a
lot has to do with load and power. Just what exactly does load mean
and how do I calculate total power if I have 3 motors with 2hp, 20hp
AND 10hp respectively?

Thanks,
GN

Quite simple. The motor is rated to work at a certain maximum load
which is the maximum work you can get out of it.

The motors you have will not necessarily be working at their power
ratings as this depends on the load in consideration.

Accurate way of getting your total power is measuring the Voltage and
current when motor is working then
in the case of 1 Phase

Power (HP) = V x I x %Eff x Power factor / 746

in the case of 3 Phase

Power (HP) = V x I x %Eff x Power factor x square root of 3 / 746

The efficiency and power factor are normally written on the data tag
of the electric motor.