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In article <4496@husc6.harvard.edu>, kiely@lownlab.harvard.edu (James P. Kiely) writes:
> Given that toroid power transformers are lighter, more efficient,
> and generate a smaller spurious magnetic field than the more
> traditional stacked pole transformers, why doesn't everyone use toroids?

	In general, two reasons:

1.	Toroids cost much more to manufacture than comventional
	transformers with E-type or U-type laminations.

2.	Toroids become quite impracticable to use for power ratings
	(at 60 Hz) beyond, say about 1 KVA.  The diameter becomes
	large, along with the concurrent difficulties in winding
	long lengths of heavier gauge wire.

	To get some idea of the problems in manufacturing "larger"
transformers, take a look at a toroidal coil winder some day.

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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