Author Topic: Possible use for large inductor (laminated core)  (Read 2398 times)

Offline RocketScienceSmurf

  • High Voltage Technician
  • ***
  • Posts: 125
  • Karma: +0/-0
    • View Profile
Possible use for large inductor (laminated core)
« on: December 09, 2019, 09:43:11 AM »
I scored two huuge (and heavy - probably around 100kg each) inductors probably made from a regular laminated core. One has a hand written label that says 35mH and the other has a label from manufacturer that says 25mH 50A.

These were bought on an auction so I did not have any chance to inspect before I bought them and since they were in a lot with a couple of 10kVA three phase transformers I had hoped/assumed at least one of them was a three phase choke of some kind but that was not the case.

Can these be used for something fun? Are they only usable in DC applications or can they be used for 50Hz AC as well?

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 435
  • Karma: +14/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Possible use for large inductor (laminated core)
« Reply #1 on: December 09, 2019, 03:59:02 PM »
If they are made of E and I sections you can delaminate them and make an adjustable air-gap ballast. I made such a ballast for my 6.5 KVA pole transformer powered tesla coil. I used about 80 pounds of laminations and 73 turns of 8 AWG stranded wire for 60 Hz power. 50 Hz would require a little more iron. I can adjust the maximum current in the range of 4 to 40 amps by using various thicknesses of plastic spacers in the air gap between the E and I sections.
« Last Edit: December 09, 2019, 08:10:58 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline davekni

  • High Voltage Expert
  • ******
  • Posts: 1722
  • Karma: +86/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: Possible use for large inductor (laminated core)
« Reply #2 on: December 10, 2019, 04:12:29 AM »
Since these already are inductors, they'll have an air gap.  If you want to adjust inductance, then the gap needs adjusting as Steve said (or the winding count changed).  So, you'll need to separate the two "halves" of the core, but likely not need to de-laminate as you would if starting with a transformer.  My guess would be that the existing gap is created by E section(s) having a shorter center leg than outer legs.  That's common in ferrite cores, but I'm not sure about silicon-iron laminations.  If that's the case, then you can add space to lower inductance, but not decrease gap to increase inductance.  Of course, if the existing inductance is close enough, that's the easiest.

Another use of an inductor is between a 3-phase bridge rectifier and the bulk-cap.  Improves power factor (and lowers the DC output voltage a bit, with higher current capability, more than the voltage reduction, so a bit more power) under load.  Just be careful of having too much inductance and the resulting bulk-cap voltage spike when the load is abruptly removed (ie. end of burst of a DRSSTC).
« Last Edit: December 10, 2019, 04:17:08 AM by davekni »
David Knierim

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1989
  • Karma: +52/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Possible use for large inductor (laminated core)
« Reply #3 on: December 10, 2019, 10:16:32 AM »
Another use of an inductor is between a 3-phase bridge rectifier and the bulk-cap.  Improves power factor (and lowers the DC output voltage a bit, with higher current capability, more than the voltage reduction, so a bit more power) under load.  Just be careful of having too much inductance and the resulting bulk-cap voltage spike when the load is abruptly removed (ie. end of burst of a DRSSTC).

I wrote a small text on passive PFC for DRSSTCs along with a couple of simulations to show the effect of a choke on the AC input.

http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/pfc/
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline RocketScienceSmurf

  • High Voltage Technician
  • ***
  • Posts: 125
  • Karma: +0/-0
    • View Profile
Re: Possible use for large inductor (laminated core)
« Reply #4 on: December 10, 2019, 11:23:48 AM »
Thank you all for great input. I will try and take some pictures of the internals and post in a couple of days.

Offline RocketScienceSmurf

  • High Voltage Technician
  • ***
  • Posts: 125
  • Karma: +0/-0
    • View Profile
Re: Possible use for large inductor (laminated core)
« Reply #5 on: December 11, 2019, 08:48:36 AM »
I took the lid of the smaller one of the chokes and took a couple of pictures yesterday. Is it two "halves" connected in parallell to increase the current rating?

I also started to look into the three phase transformers. I think they can be used as is connected in "Wye" configuration with 230V AC between Live and Neutral. It would be a shame to scrap these for the copper so I would like to find a way to use them instead.

High Voltage Forum

Re: Possible use for large inductor (laminated core)
« Reply #5 on: December 11, 2019, 08:48:36 AM »

 


* Recent Topics and Posts

post Re: Aluminium Nitride Thermal Pads
[General Chat]
Weston
Today at 08:33:16 AM
post Re: Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mike
Today at 04:20:00 AM
post Re: Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 02:25:07 AM
post Re: Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
Today at 02:18:56 AM
post Re: Problem with VTTC Staccato interrupter PLZ HELP
[Vacuum Tube Tesla Coils (VTTC)]
davekni
Today at 01:57:37 AM
post Re: Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 01:54:04 AM
post Re: Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
Today at 12:09:56 AM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 13, 2022, 10:14:40 PM
post Problem with VTTC Staccato interrupter PLZ HELP
[Vacuum Tube Tesla Coils (VTTC)]
NerdlabsMadScience
August 13, 2022, 09:32:08 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 13, 2022, 09:11:03 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 13, 2022, 08:45:41 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 13, 2022, 08:20:01 PM
post Re: Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 13, 2022, 08:00:14 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 13, 2022, 07:41:45 PM
post A little idea I had for my dual full bridge design
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Overlordcheese
August 13, 2022, 06:42:34 PM
post Feedback problems
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
August 13, 2022, 06:17:43 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 13, 2022, 03:18:05 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 12, 2022, 11:03:52 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 12, 2022, 10:53:44 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 12, 2022, 10:13:02 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 12, 2022, 09:35:29 PM
post Re: Aluminium Nitride Thermal Pads
[General Chat]
klugesmith
August 12, 2022, 08:28:28 PM
post Re: Aluminium Nitride Thermal Pads
[General Chat]
davekni
August 12, 2022, 07:26:41 PM
post Re: Aluminium Nitride Thermal Pads
[General Chat]
alan sailer
August 12, 2022, 06:52:58 PM
post Re: Aluminium Nitride Thermal Pads
[General Chat]
klugesmith
August 12, 2022, 06:39:27 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 12, 2022, 06:38:44 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
klugesmith
August 12, 2022, 05:57:00 PM
post Re: Aluminium Nitride Thermal Pads
[General Chat]
klugesmith
August 12, 2022, 12:44:20 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 12, 2022, 08:36:23 AM
post Aluminium Nitride Thermal Pads
[General Chat]
Weston
August 12, 2022, 04:31:17 AM
post Re: Helpy Trying to Replicate This Strange Slittle DRSSTC? PLS
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
August 12, 2022, 02:55:27 AM
post Re: Small DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mike
August 12, 2022, 01:27:14 AM
post Re: Small DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 11, 2022, 11:51:42 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
davekni
August 11, 2022, 11:35:43 PM
post Say what -- arcing TO polycarbonate!
[Voltage Multipliers]
abstruse1
August 11, 2022, 10:56:28 PM
post Re: Half-bridge for my first sstc
[Printed Circuit Board]
Mads Barnkob
August 11, 2022, 07:40:03 PM
post Re: Huge Mistake Designing My Coil
[Spark Gap Tesla Coils (SGTC)]
MarcusFunt
August 11, 2022, 06:54:14 PM
post Re: Huge Mistake Designing My Coil
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
August 11, 2022, 05:07:28 PM
post Half-bridge for my first sstc
[Printed Circuit Board]
LoOdaK
August 11, 2022, 11:13:20 AM
post Huge Mistake Designing My Coil
[Spark Gap Tesla Coils (SGTC)]
MarcusFunt
August 11, 2022, 10:03:54 AM
post Re: Small DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mike
August 11, 2022, 06:12:48 AM
post Re: Painfully Amazing Stuff
[Voltage Multipliers]
klugesmith
August 11, 2022, 03:14:55 AM
post Re: Painfully Amazing Stuff
[Voltage Multipliers]
55#sofcopper
August 11, 2022, 02:55:16 AM
post Painfully Amazing Stuff
[Voltage Multipliers]
alan sailer
August 10, 2022, 10:47:09 PM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
klugesmith
August 10, 2022, 07:51:16 PM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
klugesmith
August 10, 2022, 06:36:23 PM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
alan sailer
August 10, 2022, 01:34:40 AM
post Re: High Voltage pcb
[Printed Circuit Board]
FonziDaytona
August 09, 2022, 10:17:24 PM
post Re: High Voltage pcb
[Printed Circuit Board]
Twospoons
August 09, 2022, 10:16:33 PM
post Re: How To Varnish A Tesla Coil Secondary Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
August 09, 2022, 09:22:37 PM
post Re: High Voltage pcb
[Printed Circuit Board]
Mads Barnkob
August 09, 2022, 09:19:26 PM
post Re: High Voltage pcb
[Printed Circuit Board]
FonziDaytona
August 09, 2022, 08:32:08 PM
post Re: High Voltage pcb
[Printed Circuit Board]
Mads Barnkob
August 09, 2022, 08:26:32 PM
post Re: Coherent VersaPulse VPW - what should I do with it?
[Light, Lasers and Optics]
Mads Barnkob
August 09, 2022, 08:15:54 PM
post High Voltage pcb
[Printed Circuit Board]
FonziDaytona
August 09, 2022, 08:15:10 PM
post Top load material selection
[Spark Gap Tesla Coils (SGTC)]
55#sofcopper
August 09, 2022, 04:44:43 PM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
MRMILSTAR
August 09, 2022, 04:20:01 PM
post Loneoceans UD 2.7 rev c issue
[General Chat]
mthome4
August 09, 2022, 03:11:56 PM
post Re: A big-ish diy xformer
[Transformer (Ferrite Core)]
oneKone
August 09, 2022, 07:30:29 AM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
fh89
August 09, 2022, 07:06:52 AM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
klugesmith
August 09, 2022, 07:06:34 AM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
davekni
August 09, 2022, 06:28:49 AM
post Re: Coherent VersaPulse VPW - what should I do with it?
[Light, Lasers and Optics]
Twospoons
August 09, 2022, 06:18:56 AM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
davekni
August 09, 2022, 06:08:53 AM
post Re: HV AC Current Measurement
[Transformer (Iron Core)]
klugesmith
August 09, 2022, 04:29:49 AM
post HV AC Current Measurement
[Transformer (Iron Core)]
alan sailer
August 09, 2022, 02:18:35 AM
post Re: Coherent VersaPulse VPW - what should I do with it?
[Light, Lasers and Optics]
TMaxElectronics
August 09, 2022, 12:42:21 AM
post Re: A big-ish diy xformer
[Transformer (Ferrite Core)]
abstruse1
August 09, 2022, 12:31:47 AM
post Re: How To Varnish A Tesla Coil Secondary Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Twospoons
August 09, 2022, 12:22:26 AM
post Re: Coherent VersaPulse VPW - what should I do with it?
[Light, Lasers and Optics]
Twospoons
August 09, 2022, 12:00:39 AM
post Coherent VersaPulse VPW - what should I do with it?
[Light, Lasers and Optics]
TMaxElectronics
August 08, 2022, 11:24:45 PM
post Re: Optic fiber interrupter in EU
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
August 08, 2022, 10:07:08 PM
post Re: How To Varnish A Tesla Coil Secondary Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
August 08, 2022, 10:01:56 PM
post Re: Optic fiber interrupter in EU
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
August 08, 2022, 10:00:22 PM
post Re: Optic fiber interrupter in EU
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
August 08, 2022, 09:52:09 PM
post Re: Helpy Trying to Replicate This Strange Slittle DRSSTC? PLS
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
August 08, 2022, 09:51:09 PM
post Re: Where To Get "Free" TO-247 IGBTs and MOSFETs
[Electronic Circuits]
TMaxElectronics
August 08, 2022, 09:50:49 PM
post How To Varnish A Tesla Coil Secondary Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
August 08, 2022, 09:47:24 PM
post Re: Syntherrupter - Build by AstRii
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
August 08, 2022, 09:44:04 PM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
August 08, 2022, 09:43:38 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
August 08, 2022, 09:42:37 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
petespaco
August 08, 2022, 09:27:10 PM
post Optic fiber interrupter in EU
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
August 08, 2022, 08:09:38 PM
post Helpy Trying to Replicate This Strange Slittle DRSSTC? PLS
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
August 08, 2022, 04:10:00 PM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
fh89
August 08, 2022, 07:54:27 AM
post Re: SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 07, 2022, 07:28:51 PM
post Re: Bipolar CW -- update
[Voltage Multipliers]
abstruse1
August 07, 2022, 07:15:11 PM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 07, 2022, 06:46:44 PM
post Re: SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alexhanyuan
August 07, 2022, 06:11:59 PM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
fh89
August 07, 2022, 08:25:56 AM
post Re: SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 07, 2022, 03:46:50 AM
post SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alexhanyuan
August 06, 2022, 10:23:27 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
davekni
August 06, 2022, 09:34:35 PM
post Re: Can someone help, am not getting any plasma :-) much appreciated
[Spark Gap Tesla Coils (SGTC)]
ItsChloeUwU
August 06, 2022, 07:49:05 PM
post Re: Primary Wire Getting Hot, Secondary flashovers, RSG Not Alway Fireing? Help pls.
[Spark Gap Tesla Coils (SGTC)]
ItsChloeUwU
August 06, 2022, 07:42:00 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
AstRii
August 06, 2022, 07:05:35 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
August 06, 2022, 04:06:48 PM
post Re: CORE FOR GDT AND CT
[Solid State Tesla Coils (SSTC)]
Didik
August 05, 2022, 11:59:58 AM
post Re: CORE FOR GDT AND CT
[Solid State Tesla Coils (SSTC)]
Rafft
August 05, 2022, 09:56:26 AM
post Re: CORE FOR GDT AND CT
[Solid State Tesla Coils (SSTC)]
davekni
August 05, 2022, 06:25:39 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal