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Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor
Hi,
I just did some experiments. I removed the brushes completely and only
connected the stator coils. I realized, that this is just impossible,
because of the only 2 stator coils and the lack of a capacitor, no rotating
magnetic field is generated and this never could work. I tried everything,
also the adition of 2 more shorted segments (4 on each side) with diodes 90
degrees appart, diodes in opposite diections, but without the brushes in
place, the rotor doesn't rotate anymore. It only creates some forces and
locks in different positions.
Stefan
----- Original Message -----
From: "Futuret" <futuret@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, December 18, 2010 5:37 PM
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous
Motor
Hi Stefan,
Nice tests, thanks. The motor seemed to show about 105 degrees of phase
shift
using the phase shifter and to me it sounded sweet :) It would be nice
to measure
the voltage across the motor while varying the phase shifter knob, to see if
there
happens to be any resonant voltage rise at some position, and how much.
I realize you just used the existing capacitor value. Using voltage control,
the
amount of phase shift seemed a little less, but still seemed good. It's
good to
see that the phase controller works well with universal motors also.
Yes, I see the motor is powerful. Apparently your motor is much stronger
than
a vacuum cleaner motor.
I see two general questions:
1) I wonder if there's a way to determine the optimal number of segments to
short
for a given motor?
2) I wonder if the diodes help for self starting (compared to the method I
tried)?
I just realized that since my motor has fewer segments than yours, by
shorting
4 segments, I actually shorted more segments as a proportion of the total.
Cheers,
John
-----Original Message-----
From: Teslalabor <teslalabor@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sat, Dec 18, 2010 10:40 am
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous
Motor
Hi,
I performed 2 tests, the phase shifter and the modified motor under load
conditions.
First the phase shifter - as expected it works well:
http://www.youtube.com/watch?v=PRi1x2SOUFI
Of course I didn't check for optimal capacitance value, I just took my
shifter which normaly runs one of my SRSG's. At the end of the video I'm
shifting the phase by adjusting the input voltage, but I think with the
shifter the results are better.
Then I did a test under load conditions - not
with a disk attached to the motor but I simulated a heavy load by driving
another washing machinemotor (unmodified) via a belt drive which runs in
generator-mode and powers 2 500W halogen bulbs. Here the testvideo:
http://www.youtube.com/watch?v=MP7EUGSDIpE
The motor on the left is an unmodified washing (universal-) motor with 800W.
I apply a DC voltage of 8V to it's stator coils for generating the stator
field. When driven by the right (modified, 4 segments at each side)) motor,
the generator delivers 100Volts into 2 halogenbulbs, each 230V/500W
connected in parallel. As you can see they glow nearly at half brightness,
so there are arround 500W electrical energy + some mechanical friction the
modified motor has to deal with.
When abruptly braking the modified motor by turning the statorfield of the
generator on and off, you can see there is no big phase change. But in SRSG
operation this is not of concern because there are no abrupt brakings.
Also watch the beld how it is deformed by the forces ;)
Believe me, these motors can drive EVERY G10 disk with heavy tungsten rods
;-)
Stefan
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