Has anyone seen Lasersabers new motor runs on 1000uf cap

[conradelektro]

@wattsup: thank you for the coil info. Will be interesting to see your experience with these coils

@mariuscivic: I could watch your video http://www.youtube.com/watch?v=gVkhjjr4Ovc. Very nice suspension of the axle. As far as I could see in the video, the axel is hovering above the magnet in the base, only the top pointed end causes a little friction? The rotor in the video has two magnets, and one magnet further to the centre?

I see that your multimeter allows to measure current (DC A). Would be interesting to see the average current draw of your contraption?

I like trigger coils and transistor based drive circuits (because I have a low opinion of Reed switches). But for very low current draw (e.g. a few µA at 1 to 2 Volt) it seems that one has to use a Reed switch. At least I could not find a transistor circuit with such a low power draw.

Greetings, Conrad

[gyulasun]

...

Designed for 24VDC.
0.179 H
0.480 kOhm

Once I measured the inductance, I simply set the scale to capacitance and it gave a reading of 0.52 uF.

...

Hi wattsup,

I recall a similar case I read somewhere on another forum or maybe on this forum that an LC meter showed a certain "capacitor" value in the some hundred nanoFarad range  when its scale or range selector switch was set to Capacitance from the previous Inductance setting when the intention was to measure a coil.

I do not think this reading (0.52 uF) has any real meaning on the coil's capacitance, I do think it is an erroneous reading.

A possible explanation may come from the inside circuitry of the LC meter, please read this quote from topic in "Stray Inductance and Capacitance" chapter from this site ( http://my.integritynet.com.au/purdic/lc-meter-project.htm#meas ), just under the Measuring Inductance and Capacitance chapter:
"If an inductor is inserted when the Cx switch is depressed the result will be an increase in frequency, F2 greater than F1, rather than a decrease. This is because the inductor has been placed in parallel with L1 and inductors in parallel always are less than the value of the smallest of the two values." 
(F1 and F2 are the frequencies of the inside oscillator as they change as per the unknown coils dictate.) Probably your LC meter operates on a similar measuring method as is described for the LC meter project in the link and your meter also gets fooled.  The self capacitance of such relay coil must be in the range of 10-20 pF or so.
(When the meter is set to C measurement scale, the inner oscillator 'expects' a real unknown capacitor but it gets a 'short circuited' capacitor i.e. a coil instead, so a real LC oscillating circuit cannot develop, this is why the erroneous display reading.)


On your relay coil: it is possible that there have been members of this KA series of relays manufactured with 48V or even 110V DC coils, so their DC resistance may have been in the some kOhm range, if you can find such types also at a bargain price they may serve better for motor operation than the present  480 Ohm coils. I mention this only if you wish to get current draw in the uA range like Lasersaber had.

rgds, Gyula

[totoalas]

When an unmodified  relay 24 v dc 14 pin was placed near the rotating N S neo magnet rotor  it produced 15 to 18 v dc  which I connected  back to the source via a diode
Using solar, wall outlet, and battery  @ 250 mA  then the additional relay for a loop back system  362 rpm  can generate additional realys / 18 v supply each   which can be placed in a bus link   .......good for stable supply like a UPS
totoalas

[conradelektro]

Wattsup wants to switch off a coil with two Reed switches. I am concerned about the simultaneous closing/opening of two Reed switches.

Now I found by chance a YouTube video that shows a clever circuit http://www.youtube.com/watch?v=auykiV4Kq68 that switches off both ends of a coil at the same time (one Reed switch, PNP and NPN transistor).

One can speculate, that two transistors do not switch the coil completely off. But that is probably not the reason for the lack of OU. Ossi motors with two Reed switches also were not OU.

The video also shows very nice magnet bearings.

Greetings, Conrad

[wattsup]

@conradelektro

There should be no problem to switch both side of the coils at the voltages we are talking about.

@LaserSaber (Posted on @LazerHacker site as well.)

Did you ever mention your coil values on the V2 and V3, inductance, resistance.

I just pulled 12 coils from some relays and was searching anywhere you may have posted this so we can compare our coils or better still find a better analog.

Also, I am putting down a more revised design that will permit to change coil numbers or magnet numbers with the least hassle possible. Just a few more ideas to make a build that will enable me to have more flexibility with one design.

wattsup