## Recommended Posts

Hi,

I need some help on this one.

I have been doing calculations ussing standard formulas for site load requirements for some time but I was taken off guard when my mate asked me why the absorbed power for i.e a 1.5kW rated motor is 1.7kW. I have never noticed this before now.

I noticed using the formulas the absorbed power is higher than the motor rated power for all motor stater types except for VSDs where the rated kW is higher than the absorbed power.

Is this correct? if yes, what is the explanation for this.

Formula - Absorbed power = shaft kW/Eff, Shaft kW = rated kW * load factor (0.9 in this case).

Regards

##### Share on other sites

• 2 weeks later...

Hi,

I agree with your comment 100%.

Where did you find this formula ?

I never saw the formula shaft kw = rated load kw x load factor

the continuous rated load can not be greater than the rated load ?

I am also confused like you. Seems to me continuous load should be

I think this origionated in some software that has a glitch. How can the rated continuous load

used to calculate the absorbed load be greater than the rated kw load.

The point of a load factor is like a duty factor or diversity factor.

Perhaps we can share what we find, that will clarify this.

Jeff

## Create an account

Register a new account

• ### Who's Online (See full list)

• There are no registered users currently online
• ### Tell a friend

Love LMPForum? Tell a friend!
×