Path: utzoo!utgpu!utcsri!uthub!koko
From: koko@uthub.toronto.edu (M. Kokodyniak)
Newsgroups: sci.electronics
Subject: Re: Running 120V AC equipment off 240V AC.
Message-ID: <701@uthub.toronto.edu>
Date: 16 Feb 88 06:16:24 GMT
Article-I.D.: uthub.701
Posted: Tue Feb 16 01:16:24 1988
References: <204@unh.UUCP> <1988Feb15.153838.5619@utzoo.uucp>
Organization: CSRI, University of Toronto
Lines: 36
Keywords: line frequency 50/60Hz

Some appliances have universal motors (with brushes) while others
have induction or synchronous motors (without brushes).
Appliances that do not care much about line frequency (since
they have universal motors):

	electric shavers
	hair dryers 
	small kitchen appliances
	power tools
	vacuum cleaners

Appliances that do care about line frequency (since some have
induction or synchronous motors):

	major appliances:
		refridgerators
		dishwashers
		washers
		dryers
	all analog clocks (with dials)
	some digital clocks (except those with battery backup)
	some phonograph turntables (especially older automatic ones
		and ones with orange-neon stroboscopes built in)
	some reel-to-reel taperecorders

Clocks usually use the line frequency to keep time, since the
utilities keep the long-term average line frequency accurate.
Cheaper turntables use an induction motor, to keep constant speed,
as do some cheaper reel-to-reel taperecorders.

Although the operation of some appliances is affected by line frequency,
they may still work satisfactorily (at somewhat lower or higher speeds):

	barbecue rotors
	electric fans
	portable heaters with fans