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From: email@example.com (Rudolf Usselmann)
Subject: Re: AC Motor Soft Starter
Date: 27 Dec 2002 20:08:49 -0800
NNTP-Posting-Date: 28 Dec 2002 04:08:49 GMT
"John Jardine" wrote in message news:...
> Be aware that an AC induction motor soft-start is not as 'soft' as what you
> may wish for. I.e it's not as soft as for a DC motor or as soft as an AC
> motor fed via an electronic inverter. The soft start just takes the sharp
> edge off the mech/elec loading at switch on.
All I need is to reduce/eliminate the initial current spike on the mains
and also to somewhat reduce physical stress.
I wonder why you say that it won't be as "soft" as I expect it to be ?
I have decided now to build it on my own, commercial units seem to
go for $450 USD, which is absolute nonsense ! I found a controller
IC from ATMEL (U2008B) that sells for about $1.60 USD. All I need
is a TRIAC (I'm thinking of using a BTA61-600 $5.50 USD) and a hand
full of other discrete parts. Should be less than $20 in parts !
Don't see how that can go wrong !
Thanks for the feedback everybody !
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