Hi,

Can I use a LCR bridge in inductance mode to measure difference in
inductance if I suspect one of the windings in an electrical motors to have
shorted turns...?

What is the preferred way to check for shorted turns within an inductor...?

Thanks for clues

Tpr

Tor Tveitane wrote:
Hi,

Can I use a LCR bridge in inductance mode to measure difference in
inductance if I suspect one of the windings in an electrical motors to have
shorted turns...?

What is the preferred way to check for shorted turns within an inductor...?

Thanks for clues

Tpr



I don't know what's preferred, but one way might be to ring it like
a flyback and look at the response.

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On Sun, 07 Nov 2004 19:25:13 GMT, CJT wrote:

Tor Tveitane wrote:
Hi,

Can I use a LCR bridge in inductance mode to measure difference in
inductance if I suspect one of the windings in an electrical motors to have
shorted turns...?

What is the preferred way to check for shorted turns within an inductor...?

Thanks for clues

Tpr



I don't know what's preferred, but one way might be to ring it like
a flyback and look at the response.

That was my thought/guess as well.

Tom

"Tom MacIntyre" skrev i melding
...

I don't know what's preferred, but one way might be to ring it like
a flyback and look at the response.

That was my thought/guess as well.

Any urls and info to show how to setup this and to diagnose the response..?

Tor

"Tor Tveitane" wrote in message
...
| "Tom MacIntyre" skrev i melding
| ...
|
| I don't know what's preferred, but one way might be to ring it like
| a flyback and look at the response.
|
| That was my thought/guess as well.
|
| Any urls and info to show how to setup this and to diagnose the
response..?

http://repairfaq.ece.drexel.edu/REPAIR/F_appfaqi.html

What sort of motor? What's shorted, field or rotor?

N

Tor Tveitane wrote:
"Tom MacIntyre" skrev i melding
...


I don't know what's preferred, but one way might be to ring it like
a flyback and look at the response.

That was my thought/guess as well.


Any urls and info to show how to setup this and to diagnose the response..?

Tor


This is the kind of thing I had in mind:

http://repairfaq.ece.drexel.edu/sam/flytest.htm#flyadv

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"Tor Tveitane" wrote in message
...
| Hi,
|
| Can I use a LCR bridge in inductance mode to measure difference in
| inductance if I suspect one of the windings in an electrical motors to
have
| shorted turns...?

Sure. Compare the ratio of inductance to resistance.

| What is the preferred way to check for shorted turns within an
inductor...?

For shorted turns in a motor use a growler.

N

"Tor Tveitane" wrote in message
...
Hi,

Can I use a LCR bridge in inductance mode to measure difference in
inductance if I suspect one of the windings in an electrical motors to
have
shorted turns...?

What is the preferred way to check for shorted turns within an
inductor...?

Thanks for clues

Tpr




I've never used one but isn't a growler used for this purpose.

electronic hints and repair briefs
http://homepages.tcp.co.uk/~diverse

"N Cook" writes:

I've never used one but isn't a growler used for this purpose.

Yes, though it would be hard to justify the expense to fix one small
motor.

See, for example: http://www.sotcher.com/mre/520.html

It's just the primary of a transformer connected to 60 Hz along with
a hacksaw blade, so you could probably build one or improvise from
something else.

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Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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On 08 Nov 2004 08:11:57 -0500 Sam Goldwasser
wrote:

"N Cook" writes:

I've never used one but isn't a growler used for this purpose.

Yes, though it would be hard to justify the expense to fix one small
motor.

Yes, but any electric motor shop, or automotive electric shop will
have a growler and would charge only a very small fee to test an
armature for you.

Disassemble the motor and just take in the rotor, so that they don't
have to do any significant work.

If you bring it over here, it would take me less than 2 minutes to
check it out. ;-)

-
-----------------------------------------------
Jim Adney
Madison, WI 53711 USA
-----------------------------------------------

Disassemble the motor and just take in the rotor, so that they don't
have to do any significant work.

IF, it's a wound rotor motor. Most ac rotors are of the squirrel cage
variety.

On Tue, 9 Nov 2004 16:41:01 -0500 "Charles Schuler"
wrote:

Disassemble the motor and just take in the rotor, so that they don't
have to do any significant work.

IF, it's a wound rotor motor. Most ac rotors are of the squirrel cage
variety.

I was wondering about that. Wouldn't a squirrel cage motor still have
the same magnetic properties? I'm not sure, but I'd bet that such a
rotor would still pass the growler test, but it's hard to imagine a
squirrel cage rotor with a short in it, which, I believe is what the
OP asked about.

Does anyone know if this happens?

-
-----------------------------------------------
Jim Adney
Madison, WI 53711 USA
-----------------------------------------------