Has anyone seen Lasersabers new motor runs on 1000uf cap

[Magluvin]

Hi Mags,

Yes, going by the estimated sizes of the bobbin, your coil may have an inductance between 160 mH to 175 mH...   

your bobbin ID may be 5 to 6 mm,  winding OD may be 16-17 mm, winding length may be 3 to 3.5 mm, you wound 3300 turns, are the bobbin sizes in the 'ballpark'?

Gyula

Hey Gyula

The ID is  3.4mm  OD is 17.6mm  depth is 2.7mm

So maybe about 4H with all coils in series I believe. Will be interesting to see what measurements will show. The bifi coils most likely wont read correctly for inductance.

Will see.  Thanks

Mags

[Magluvin]

Sacrificed 1 clip to get the measurement. lol  These things aint cheap on the street! Caliper would not fit in the gap to measure ID.  I have a lot of extras.

Had seen some nuce clips today that had good depth. They were on a door panel. I cant have those. So many different kinds.

Mags

[gyulasun]

Hey Gyula

The ID is  3.4mm  OD is 17.6mm  depth is 2.7mm

So maybe about 4H with all coils in series I believe. Will be interesting to see what measurements will show. The bifi coils most likely wont read correctly for inductance.

Will see.  Thanks

Mags

Hi Mags,

Well, with those bobbin sizes the inductance calculates to about 140 mH (138.7 mH).  This is the calculator I have used:
http://www.pronine.ca/multind.htm    It asks for an inductance value from the user in advance, so some playing with the numbers is needed.
If we consider the number of turns is 3300 and wire gauge #42 as dependable data, together with the measured bobbin ID 3.4 mm and depth (i.e coil length l) 2.7 mm, then you have to enter 138.7 mH for L to arrive at the 3300 turns.  Then the coil OD comes out as 15.77 mm, wire length as 323.44 feet and DC resistance as 536.58 Ohm.

Regarding your coming L meter, the built-in measuring frequency hopefully will be low (less than 100-200 Hz) because a coil may manifest different L values at different frequencies, normally L decreases with increasing frequency, just due to self capacitance and L disappears at a frequency high enough to give a first resonance with self capacitance.  This is a good link to measure self capacitance of coils:  http://www3.telus.net/chemelec/Calculators/Interwire-Coil-Capacitance-Calc.htm  may come as helpful for your bifilar coils too.

Sorry to hear you had to sacrifice a bobbin to get to the mechanical sizes, hopefully this has been the biggest loss in this setup.

Gyula

[Magluvin]

Hi Mags,

Well, with those bobbin sizes the inductance calculates to about 140 mH (138.7 mH).  This is the calculator I have used:
http://www.pronine.ca/multind.htm    It asks for an inductance value from the user in advance, so some playing with the numbers is needed.
If we consider the number of turns is 3300 and wire gauge #42 as dependable data, together with the measured bobbin ID 3.4 mm and depth (i.e coil length l) 2.7 mm, then you have to enter 138.7 mH for L to arrive at the 3300 turns.  Then the coil OD comes out as 15.77 mm, wire length as 323.44 feet and DC resistance as 536.58 Ohm.

Regarding your coming L meter, the built-in measuring frequency hopefully will be low (less than 100-200 Hz) because a coil may manifest different L values at different frequencies, normally L decreases with increasing frequency, just due to self capacitance and L disappears at a frequency high enough to give a first resonance with self capacitance.  This is a good link to measure self capacitance of coils:  http://www3.telus.net/chemelec/Calculators/Interwire-Coil-Capacitance-Calc.htm  may come as helpful for your bifilar coils too.

Sorry to hear you had to sacrifice a bobbin to get to the mechanical sizes, hopefully this has been the biggest loss in this setup.

Gyula

Thanks Gyula

The meter specs specified freq for capacitance ranges, but not for the inductance ranges. Being that it has ranges for inductance, it probably does use different freq ranges for different selected ranges. I have a couple known inductors I will check it with . The delivery is suppose to be 18th or 19th. Tomorrow or friday.

The dead Kenny bobbin. lol  I only made that a joke because these things are expensive at the auto parts stores.

http://www.ebay.com/sch/i.html?_trksid=p2047675.m570.l1313.TR11.TRC1.A0.Xdoor+panel+clips.TRS0&_nkw=door+panel+clips&_sacat=0&_from=R40


Mags

[gyulasun]

...
The meter specs specified freq for capacitance ranges, but not for the inductance ranges. Being that it has ranges for inductance, it probably does use different freq ranges for different selected ranges. I have a couple known inductors I will check it with . The delivery is suppose to be 18th or 19th. Tomorrow or friday.
...

Yes, you can hook up different coils and just use an oscilloscope with 10:1 probe across the coil being measured to check the oscillating frequency (mostly saw-tooth like waveforms).  or use a digital frequency meter (there are multimeters with frequency measuring feature too).  (Of course, using a probe or a freq meter across a coil being measured will change the displayed inductance a little but not the measuring frequency.)

Gyula