[AMPS] Relays hanging up

measures 2@vc.net
Sat, 12 Aug 2000 12:13:30 -0700


>
>> >> >> When we did that we could hear virtuallu hundreds
>> >> >> of relays clickking off held by residual magnetism.
>> >
>> >Well he "says" it was residual magnetism. I guess we have to 
>> >believe somehow he knows that's what it was, and not weak 
>> >springs or other mechanical problems.
>> >
>> Because the relay stopped hanging up when I reversed polarity.  
>
>You were there Rich? When did you work for the telephone 
>company in Europe?

€  Mr. Rauch plays the Duhhh Card.  
>
>> >That's right. With a weak enough spring, the relay won't have any 
>> >return force.
>> >
>> The relay did not hang up after I reversed the magnetic field.
>
>You were there?
>
€   The sticking relay was in one of my amplifiers.   
>
>> >But if the iron is soft it should also have no flux storage. 
>
>> All types of iron can be magnetized.  
>
>Depends on how much you mean by magnetized. 

€  magnetized enough to cause the relay to stick.  

> Certainly all iron 
>materials have ability to retain SOME amount of magnetism, but 
>with proper material selection and treatment it can be negligible in 
>applications like relays.

You said "no (magnetic) flux storage".  
>

later, Tom. 

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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