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From: dhesi@bsu-cs.UUCP
Newsgroups: rec.audio,sci.electronics
Subject: Re: Audio equipment on 220V/50Hz
Message-ID: <1553@bsu-cs.UUCP>
Date: Fri, 20-Nov-87 14:30:34 EST
Article-I.D.: bsu-cs.1553
Posted: Fri Nov 20 14:30:34 1987
Date-Received: Sun, 22-Nov-87 07:33:22 EST
References: <4032@watdcsu.waterloo.edu> <8884@utzoo.UUCP> <63KEN@ORION>
Reply-To: dhesi@bsu-cs.UUCP (Rahul Dhesi)
Organization: CS Dept, Ball St U, Muncie, Indiana
Lines: 24
Xref: utgpu rec.audio:3633 sci.electronics:1548

In article <63KEN@ORION> KEN@ORION.BITNET (Kenneth Ng) writes:
>Using a 60 Hz transformer at 50 Hz will probably be ok, the opposite might
>not.  Heat generated by the transformer is a function of the 'area' of
>the hysterious curve multiplied by the frequency.  Therefore the lower
>the frequency the lower the heat production.

Please, somebody correct me if I am wrong.  A long time ago I wound
several transformers.  Without knowing the theory, but simply
consulting some reference books, I discovered that the bottom line was
that the higher the frequency the fewer turns one needed to create an
intense enough magnetic field.

Based on this, I conclude that if one uses a 60 Hz transformer at 50
Hz, there will be greater resistive losses and greater heat
production.  Simple extreme example:  go from 60 Hz to 1 Hz.  Most of
the current will cause heating, unless you increased the number of
turns in the primary to compensate for the decreased magnetization of
the core.

The question is then whether the heat generated in a transformer is
mostly due to hysteresis loss or due to resistive loss.  I won't even
try to guess.
-- 
Rahul Dhesi         UUCP:  <backbones>!{iuvax,pur-ee,uunet}!bsu-cs!dhesi