The motor and its coils are getting the rectified DC from the rectenna.
They are not part of the resonant system.
The main problem is that the motor needs a lot more current than the LED did.
Rather than power the thing with microwaves, the simple approach of using batteries is probably so easy and cheap that implementing Cathal's dream machine would never be as practical or cheap. I was just trying to rise to the challenge. :-)
Has anyone on the list built their own magnetic stirrer yet?
A motor, a bar magnet glued to the axle, a couple batteries, and a non-ferrous metal enclosure to prevent the microwaves from cooking the batteries, and you are all done. Add a rheostat to control the speed. You could drill a hole in the metal box for the axle and glue the magnet on the outside of the metal box, then put a glass plate above it to hold the beaker to be stirred.
On Sat, Jul 6, 2013 at 8:19 PM, Nathan McCorkle <nmz787@gmail.com> wrote:
On Sat, Jul 6, 2013 at 6:46 PM, Simon Quellen Field <sfield@scitoys.com> wrote:Aren't you discounting the length of the coils in the motor? We don't
> The emitter is inside the microwave oven. Mine has 1400 watts, which seems
> to be plenty of power to boil water.
>
> You need the diode. It converts the gigahertz frequencies into DC that the
> motor can use.
>
> A dipole antenna is simply two conductors whose length determines the
> frequency at which the antenna is resonant. For collecting power, you don't
> actually need to be resonant. You'd collect less power, but there is 1400
> watts to play with, and the motor only needs 50 milliwatts or so.
>
> The microwave oven frequency is 2.45 GHz. A wavelength is thus 12.24
> centimeters. A half-wave dipole would thus be 6.12 centimeters across, with
> each leg being a bit over 3 centimeters long. Cut each lead of the diode
> down to 1.2 inches and you have your rectifying antenna for 2.45 GHz.
>
really know how long they are, and they're probably a different gauge,
if the thickness matters (but it sounds like you say the length only
matters).
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