No load current of asynchronous motors

[koruma]

What percentage of full load current is considered normal for no load conditions in squirrel cage induction motors?

 

[electricpete]

No load current magnitude varies from approx 20%-60%, with low speed motors generally being closer to 60% and 2-pole motors generally being closer to 20%.

 

[peterb]

Just to add a note to your response, Electricpete, the no-load current is mainly reactive. There is not much difference between the no-load & the full load reactive current, which is the motor magnetizing current.

 

[jbartos]

Suggestion: Visit

http://www.micromo.com/03application_notes/appnote2.asp

http://www.micromo.com/09motorgearheadfaqs.asp

http://www.elevatordrives.com/data/files/hpv900_techmanual_tm4090.pdf

etc. for more info.
It appears that the no load current of 20% or less of rated full load current could lead to a very high power factor.

 

[peterb]

OK, jbartos, I'll bite on this one.
Your suggested links lead to -
a) - A manufacturer of small, special purpose DC motors
b) - The manual for a variable speed drive for elevator applications.

What, precisely, do these links have to do with the question in hand, which relates to the no-load current of squirrel cage induction motors?

Also, note that the power factor at no-load will tend to be be LOW, not high.

 

[peterb]

jbartos -
On re-reading the above, it comes to me that what you meant was that for a no-load current of 20% or less, the full load power factor would be extremely high (around 0.98). I agree with this, but still question the relevance of the links.