On 10/24/18 7:53 PM, Craig Cook via TriEmbed wrote (snipped):
I have been using this
https://smile.amazon.com/gp/product/B00XK3ALS0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
for the last 8 years roasting green beans.
It's discontinued. I have one of these to replace it:
https://www.gopresto.com/product/presto-poplite-hot-air-corn-popper-04820https://smile.amazon.com/gp/product/B00006IUWA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Given that new information, would it change the proposed design?
One thing we can't tell from those listings is whether the blower motor
is 120 VAC or some DC motor. I doubt you'll find that any way other
than taking one apart. Depending on what kind of motor is in there, you
will have different limitations on how it can be powered:
- A shaded pole 120 VAC motor will respond fairly well to chopped AC,
but DC will turn it into a brake.
- A universal motor (with windings for both armature and field) can be
run from either AC or DC, but DC requires a lower voltage or external
current limiting (an inductor's impedance increases with frequency, so
DC through a coil will reach a higher steady-state current than AC at
the same voltage).
- A permanent-magnet DC motor of course requires DC, which is easy to
control with PWM.
Isn't engineering fun? :D
-B
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