HomeRoast Digest


Topic: air cleaners & blowers (4 msgs / 70 lines)
1) From: Mike Masse
I  read  a  post where someone is looking for ideas for a cyclone
air cleaner and centrifugal blowers with good pressure ...
My  suggestion is to go to a HVAC parts supplier and check into a
induced  draft  blower  for  a gas furnace.  Even the smallest of
them  is  capable  of moving 50,000 btu -- so approx 18,000 watts
...  should  be  able to handle the average roaster!!  Throw some
resistors  ,  or maybe even a ceiling fan control in-line and you
should  be able to vary the cfm of air moved (not positive if all
motor types can be modulated like that)
FWIW
Mike

2) From: Scott Marquardt
Holy cow.
Uh . . . OK. I'll look into that.   ;-)
On 3/12/06, Mike Masse  wrote:
<Snip>
ribes) go tohttp://sweetmarias.com/maillistinfo.html#personalsettings<Snip>
--
Scott

3) From: raymanowen
"not positive if all motor types can be modulated like that"
I am- they can't.
The motor in my K'more front loading washer is a variable speed job- soft
starting, reversing, etc. Far from being a universal motor, with its pesky
brushes, it's a three phase motor. The three phase power is generated by a
single chip driving some power MOSFETs.
Cheers -RayO, aka Opa!
--
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Might=
y
Wichita WurliTzer

4) From: Aaron
snip......The three phase power is generated by a single chip driving 
some power MOSFETs.
back in the days they used T connected transformers... but those were 
rather hearty devices, and now we couldn't use something that might last 
and rob us out of a nice hefty repair bill next big power spike now 
could we?
gotta love technology
aaron


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