Growler Testing

[mbailey]

Does anyone know where I can purchase a growler that is capable of testing large rotors? I am needing to test rotors that are 11 to 18 inches in diameter but would like the capacity to go as large as a 34" diameter. I am also interested in the magnetic paper that is used to show dead rotor bars. Any assistance is appreciated.

Thanks, MB

 

[Clyde38]

Try

http://electricmotorsupplies.com/magnetic_viewing_film.htm

 

[jraef]

Every gr4owler I have seen is custrom made, usually in-house because most motor shops have machining capability. EASA sells a book on how to do it.

http://www.easa.com/other/books.html

scroll down to the Growler book.

JRaef.com
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[mbailey]

Thanks guys, I know the general concept behind growler design and we have built one in the past. It's toast now and we are in need of another one. I was hoping that I could purchase one commerically and save the time and resources in building one. PR&J makes one that is similar to our core loss tester, a 1950 something model. Good design and it still works, but the PR&J is not big enough. Thanks for the tips. MB

 

[waross]

In any DC machine with the fields in good shape, you may use the stator to do testing. Energise the fields with 120 VAC and turn the rotor manually Connect a voltmeter across the brushes. Normally, with the brushes in the proper position you will read zero volts, but any winding faults in the rotor will show up as a varying voltage at the brushes.
respectfully

 

[petronila]

Hello mbailey,

One Growler with above size is very difficult to find and the way is built, Try with transformer repair shops or transformer manufacturers.


Regards

Petronila

 

[mbailey]

Thanks a lot guys. Your suggestions have been a great help. MB