Re: [TCML] 50Hz = 'short end of the stick?'

["David Rieben" <drieben@xxxxxxxxxxx>]

Christopher,

Yes, a lower frequency operation would tend to feel
the effects that you mention, but basically the difference
between 50 hz and 60 hz is small enough that these
effects would likely be negligible, at least as far as any-
thing noticable goes. As a matter of fact, many consumer
electrical appliances of an inductive nature (which is the
type that it would matter with) will have "50 hz/60 hz"
on its nomenclature label. This suggest that the appliance
can run on its rated voltage at either 50 or 60 hz, with no
ill-effects, one way or the other.

David Rieben


----- Original Message ----- 
From: "Christopher Karr" <chriskarr4@xxxxxxxxxxx>
To: "Tesla Pupman List" <tesla@xxxxxxxxxx>
Sent: Friday, March 26, 2010 7:01 PM
Subject: [TCML] 50Hz = 'short end of the stick?'



Hello everyone,

I was curious as to the thoughts of list members about the line frequency 
versus the efficiency of their coils and their coils' components, as well as 
monetary-effectiveness

For example, a line frequency which is lower results in a less-efficient
transformer (weight:wattage) and a larger tank capacitor for the same 
voltage when compared to a higher frequency. Since they require a larger 
tank capacitor, the bang-energy is larger, but the repetition-rate (and, 
thus, streamer growth) is smaller (infrequent in comparison to a 400Hz 
system).

So far, we have established that:
1) In 50Hz-Land(s), your transformer is more expensive and more heavy (due 
to materials) than in 60Hz-Land(s);
2) In 50Hz-Land(s) the tank capacitor must be of a larger value at the same 
voltage and, thus, more expensive;
3) The streamer-growth should be expected to be lesser in 50Hz-Land, due to 
a relatively low bang-frequency, and;
4) The bang-energy in a 50Hz system will be larger, which contributes to 
secondary coil arc-overs to primary, due to over-coupling (since there is a 
higher peak-current).

For the remainder of this post/message, the focus will be on point (4).

Since the bang-energy is larger, over-coupling is likely to occur, but if it 
does not (due to a primary resistance being sufficient to allow the 
capacitors to discharge in an appropriate time for the coil to quench before 
the next AC half-cycle begins, but not immediately), it is almost certain 
that the coil will further lose efficiency due to a lessened power-transfer 
(since the current is lower, the magnetic field is less affective upon the 
secondary coil).

The point which seems obvious here is this - the higher the frequency of 
your coil (when not using a SMPS), the more efficient it should be in terms 
of weight, size and production cost, as well as output:$(input).

As far as is clear, has anybody made this analysis before, or used the same 
coil on a 50Hz&60Hz line with transformers of the rated frequency and the 
same voltage & current output, as well as correcting primary capacitance to 
the same percentage above resonance?

Thank you for your time (and patience, if this post is riddled with 
misconceptions - I am only sixteen years old, after all!),

- Christopher Karr


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