Previous in Forum: Testing of YNZN11 Vector Group Transformer   Next in Forum: Effect of Frequency on Power Cable
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
10 comments
Rate Comments: Nested
rajanbt
Participant

Join Date: Dec 2010
Posts: 4

Electrical Engineering

05/20/2012 6:00 AM

How to calculate the 3PHASE Induction Motor No LOAD CURRENT?
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
JRaef
Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#1

Re: Electrical Engineering

05/20/2012 7:41 AM

Disconnect the load, turn on the motor, clamp on an ammeter. There is no accurate way to calculate it, no two motors are alike.

Nice descriptive thread title by the way.

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#2
In reply to #1

Re: Electrical Engineering

05/20/2012 8:02 AM

JR, that's far too simple.

True, but too simple.

__________________
 The reports of my death are greatly exaggerated.
Register to Reply
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#3

Re: Electrical Engineering

05/20/2012 8:46 AM

There is one way.

Disassemble the motor and count the windings on each pole. Multiply that number by 11. Divide the result by the number of poles. Multiply the result by the operating voltage of the motor. Divide that number by the cross sectional area of the windings.

Finally, multiply that number by 3/5 in the northern hemisphere, and 5/3 in the southern hemisphere and then add your IQ. That should give you the NLC within 5%.

Or, do what #1 or #2 say.
Register to Reply
JRaef
Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#5
In reply to #3

Re: Electrical Engineering

05/20/2012 8:58 PM

Multiply by my IQ? Before or after beers?

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#6
In reply to #5

Re: Electrical Engineering

05/20/2012 9:24 PM

No, No!

ADD your IQ, not multiply by your IQ.

Oh, never mind, you've already had the beers.

I can get you into mathematic's anonymous if you need help.
Register to Reply
V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
Good Answers: 42
#9
In reply to #3

Re: Electrical Engineering

05/22/2012 7:54 AM

and enjoy the fun.
Register to Reply
wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#4

Re: Electrical Engineering

05/20/2012 2:34 PM

But Tony, the Essence of Good Engineering is Simplicity.
Register to Reply
pnaban
Guru

Join Date: Jun 2010
Location: srilanka
Posts: 2725
Good Answers: 5
#7

Re: Electrical Engineering

05/21/2012 1:33 AM

Write to the manufacturer.

__________________
 pnaban
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
Good Answers: 42
#8

Re: Electrical Engineering

05/22/2012 7:51 AM

Get a good electrical engineering book on induction motors and study well you will get the answer. Do not expect others to spoon feed you.
Register to Reply
sharath4
Commentator
India - Member - Proud to be INDIAN Engineering Fields - Power Engineering - New Member

Join Date: Jul 2011
Location: Bengaluru, India
Posts: 91
#10

Re: Electrical Engineering

05/24/2012 3:22 AM

Connect ammeter. Run the motor by applying rated voltage at rated frequency. Ammeter shows the no load current. No theoretical calculations i think.

__________________
 you need to go, to get something
Register to Reply
Register to Reply
Have a Different Question?
10 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

JRaef (2); lyn (2); pnaban (1); sharath4 (1); TonyS (1); V.I.Abraham (2); wareagle (1)

Previous in Forum: Testing of YNZN11 Vector Group Transformer   Next in Forum: Effect of Frequency on Power Cable

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (79 right now)
Show Members
Advertisement