I just got 2000 Volt peaks showing on the meter without any caps connected. Bit scary...   

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Quote from: chalamadad on September 30, 2011, 01:18:40 PM
I just got 2000 Volt peaks showing on the meter without any caps connected. Bit scary...   

Made a short video:

http://www.youtube.com/watch?v=1fD8diviDaY

Hi,

Normally,  most digital multimeters go crazy when used in pulsed or sparked enviroment or pulsing voltage is measured. I suggest first to place any resistor between 10k to 47k across the diode bridge output as a load and also a few uF puffer capacitor would be good for filtering the fluctuations. Notice the capacitor voltage rating, should be in the 250-300V DC rating range, even when you have some 10k load in parallel with it, to be on the safe side.

Gyula

Quote from: gyulasun on September 30, 2011, 04:05:15 PM
Hi,

Normally,  most digital multimeters go crazy when used in pulsed or sparked enviroment or pulsing voltage is measured. I suggest first to place any resistor between 10k to 47k across the diode bridge output as a load and also a few uF puffer capacitor would be good for filtering the fluctuations. Notice the capacitor voltage rating, should be in the 250-300V DC rating range, even when you have some 10k load in parallel with it, to be on the safe side.

Gyula

Yes, probably something like that. But still I can get about 72 Volts w/o caps with the new reed. Need to play with the caps a little to see if I can make use of that. Small 0.22µF cap fills very quickly to 250V but there is not enough punch in such a small one.

Hi Chamaladad

it could be your voltage is even higher than 2000V since backemf/recoil recovery makes for generally X20 volts in cap and coil-shorting of gernator coil also makes for about X20 volts into cap too, so those reed swtiches being such ultra low ressitance, and also the sort of quick double-pulse they do (ront then back edge of rotor magnet will close them in doublepulse)
so you might be actually shorting the "backemf" created by a generator coil being shut-off real quick turned on, and shut off again, dont know it this is the case, but it could be - coil shorting at peaks has amazing voltage-gain in caps that is for sure...mabye you really have 4000V spikes but your meter and scope cant show this....

Besides Gyulla's resistor idea, also you can control the voltage into cap, and also any lugging you might get, with a AC type cap in series on one leg of DC cap, this working liike "high bypass filter" letting the high end stuff go through and blocking th low end...big uf like 100uf will let lots of power go through, small uf like 6uf will block lots of power and cap will fill much slower so find good size for whatever you are doing and you cna control the rate-of-charge in cap this way.

Easiest thing to do is fill up larger size capacitor like 500uf or 1000uf instead of very small one - now the reisstance of bigger cap will slow down the cap-charge rate, and also dampen those high voltage spikes too....

try and find DC cap size that will sustain your motor with it having powersupply/battery runnig your motor swtiched into this DC cap say for example once a revolution timed in-between motor coil pulses. then if you can fill up that cap wihtin one revolution of motor, it will run by itself...I bet 1500uf would be good size for your motor for having it pulsed by power supply once per revolution to keep it going...you dont have to do it once a reolution that is just idea to make it simple to do.

You can "split" the motor coil pulse supply - like running it on two batteries with the two motor coil circuits totally isolated from one another - then fill up 1500uf cap A with the coil shorting, and cap A runs motor coil circuit B and 1500uf cap B is filled by coil shorting , and cap B runs motor coil circuit A