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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Telephone Magneto?


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  #1  
Old 03-17-2018, 10:05:21 PM
SteveK SteveK is offline
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Default Telephone Magneto?

Anyone ever tried running an engine with a telephone magneto? I bought one at an antique store for a dollar and was wondering what to do with it.
I forget how many volts but I know it has output and makes AC. I was thinking of trying it on a low tension ignition engine after starting on battery switch to magneto. Ignitor points are open until it trips. I am not sure if the AC out put will work with a coil though as the magnetic field changes back and forth but then again it only will have a closed circuit for an instance.

Thoughts?
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Old 03-17-2018, 10:26:55 PM
Thaumaturge Thaumaturge is offline
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Default Re: telephone magneto?

Telephone magnetos develop about 90VAC ring voltage, but maybe could be used to drive a step up transformer. Like maybe a flyback transformer off an old CRT monitor.
Doc
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Old 03-18-2018, 05:17:48 AM
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Elden DuRand Elden DuRand is offline
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Default Re: telephone magneto?

Doc:

SteveK was talking about an ignitor engine. It could possibly work except I would be leery of spinning it through the gears of the crank. It would spin really, really fast and the bearings and windings would probably grenade.

Then, with the high RPM, the voltage could rise to the point where the insulation in the windings fails.

Good thought, good idea but maybe a nice shelf would be the best place for the magneto.
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Old 03-18-2018, 06:55:46 AM
oldgoat oldgoat is offline
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Default Re: telephone magneto?

90 to 100 v ac but only milliamps of current don't think it will suit the purpose
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Old 03-18-2018, 05:06:40 PM
SteveK SteveK is offline
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Default Re: Telephone Magneto?

Thanks for the replies! I understand what you mean Elden

I was going to go direct to the armature to avoid a grenade scenario

90V seems tall to run through a low tension coil at any rate. On the shelf it will stay for now.
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Old 03-18-2018, 06:06:51 PM
Pat Barrett Pat Barrett is offline
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Default Re: Telephone Magneto?

I've heard stories about people using them to "Go fishing" and shocking fish into floating up to the top to be netted up. Illegal here. Called "Telephoning"
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Old 03-18-2018, 06:30:15 PM
DustyBar DustyBar is offline
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Default Re: Telephone Magneto?

Quote:
Originally Posted by Pat Barrett View Post
I've heard stories about people using them to "Go fishing" and shocking fish into floating up to the top to be netted up. Illegal here. Called "Telephoning"
I always thought DuPont spinners were more fun.
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Old 03-18-2018, 06:45:22 PM
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Elden DuRand Elden DuRand is offline
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Default Re: Telephone Magneto?

Quote:
Originally Posted by SteveK View Post
Thanks for the replies! I understand what you mean Elden

I was going to go direct to the armature to avoid a grenade scenario

90V seems tall to run through a low tension coil at any rate. On the shelf it will stay for now.
Steve:

When a low tension magneto is used, an induction coil is not needed. The inductance of the magneto coils does the job.
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Old 03-18-2018, 09:55:44 PM
SteveK SteveK is offline
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Default Re: Telephone Magneto?

Ok! had not thought about that. I was assuming the mag output would be too low and need the coil. Glad you pointed that out.

On a side note some quick math, flywheel 24 inches, crank gear on mag 3 inches armature gear 1 inch. At 400 engine rpms that would spin that baby around 9000 rpms!! You dont think it would hold up? What a sight!!

I took a starter off a car once that had stayed engaged. It appeared that somewhere between first and second gear the copper windings met up with the field magnets! I must have poured 2 cups of dust out of that starter housing!
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Old 03-19-2018, 06:35:47 AM
oldgoat oldgoat is offline
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Default Re: Telephone Magneto?

I have come across a few telephone magneto's where they turned them with a 32v drill probably 500 rpm which meant the armatures were doing about 3000 rpm . Certainly threw all the winding out and chopped up on the pole pieces.
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Old 03-19-2018, 03:28:52 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Telephone Magneto?

The phone mag will not stand up to more than 3 or 4 hundred RPM. I had one belted to a model steam engine, and used it to light 1.5 volt flashlight bulbs. About 4 was all it could handle. It would light a small flourescent tube though, albeit dimly. (6" tube)
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