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Generators & Electric Motors General Discussion

need simple explanation for GROWLER


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  #1  
Old 01-27-2007, 02:21:45 PM
werfymmot werfymmot is offline
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Default need simple explanation for GROWLER

Hello all, can anybody give me a simple explanation of what a GROWLER does ?

I am sending an old (1930-40's)Onan double wound(?) AC/DC (gen/starter )armature to be checked and would like to know what it will tell me. I have been told by an old motor repair friend that my armature needs a growler checkout to confirm the windings are still OK, ie not shorted(?), but I dont understand how it can do that....

Am I on the right track?

thanks

Eric
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Old 01-27-2007, 02:52:34 PM
Merritt Merritt is offline
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Default Re: need simple explanation for GROWLER

wikipedia knows the answer to everything...

http://en.wikipedia.org/wiki/Growler_(electrical_device)

cant explain it any better than that..
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Old 01-27-2007, 11:43:01 PM
werfymmot werfymmot is offline
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Default Re: need simple explanation for GROWLER

thanks Merritt, I think I am getting there...

ej
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Old 02-02-2007, 06:12:58 PM
David K David K is offline
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Default Re: need simple explanation for GROWLER

The link doesn't work anymore but I would really like to read what it once said.

I have a growler. Bought it at an auction for $4. Nobody at the auction but me knew what it was. I've read about them, know they are for testing rotors, and can even recognize one when I see it. But to tell the truth.....I don't fully understand how to use it. And I don't know anybody that can show me. Can somebody explain how to use it? Thanks.

Dave
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Old 02-03-2007, 12:48:48 AM
werfymmot werfymmot is offline
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Default Re: need simple explanation for GROWLER

David, I had to search in the listings on Wickpedia to find the explanation. Short version. put the armature on the growler, power up and move a hacksaw blade over the armature parallel to the axis, if it vibrates there is a short.

Eric
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Old 02-03-2007, 04:34:50 AM
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ListerDiesel ListerDiesel is offline
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Default Re: need simple explanation for GROWLER

Quote:
Originally Posted by David K View Post
The link doesn't work anymore but I would really like to read what it once said.

I have a growler. Bought it at an auction for $4. Nobody at the auction but me knew what it was. I've read about them, know they are for testing rotors, and can even recognize one when I see it. But to tell the truth.....I don't fully understand how to use it. And I don't know anybody that can show me. Can somebody explain how to use it? Thanks.

Dave
Simplified Explanation:

Most of them use an AC field that is generated in the pole pieces to energise the armature that is resting there. The test is for a shorted turn in the armature, which shows by the pole that has the faulty winding around it giving out an AC field that vibrates a screwdriver or hacksaw blade that is resting in it. The name 'Growler' comes from the noise it makes when a bad winding is detected.

Transformer theory is what the device is based upon. Any shorted turn will act like a transformer winding and a current will flow through the winding generating an AC magnetic field.

A good winding won't be affected by the AC field so nothing happens on poles with good (open-circuit) windings.

Peter
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Old 02-03-2007, 09:54:25 AM
sparkplug54 sparkplug54 is offline
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Default Re: need simple explanation for GROWLER

I have a Growler, Its a 29 pound cocker spaniel. DAn
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Old 02-03-2007, 11:00:56 PM
ZackaryMac ZackaryMac is offline
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Default Re: need simple explanation for GROWLER

Re: Growler

The wife falls into this category on occasion...
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