Posted by Tom Fleming on July 14, 2013 at 17:38:54 from (67.20.233.75):
In Reply to: E4A Magneto posted by EM Iowa on July 11, 2013 at 22:10:04:
well, Teddy, you are correct. If you want to get down into the physics behind all this, it has to do with the conservation of mass and energy. Each electron has mass, and thus requires KE (energy) to move it. A weak magnetic field, but fast RPM's will produce a reasonable spark. A strong magnetic field, and low RPMs will produce an equivalent spark. MASS x Velocity = KE.
KE is requires to increase the PD (potential difference) between the 2 poles in a magneto. By passing the copper windings in a magneto through a magnetic field, a PD is represented by induced voltage. Now, this is where the coil comes in. This low voltage (PD) is introduced into the primary windings of the coil. When the rotor turns (and the points open) the field collapses. The result is a step up, or induced voltage on the secondary windings (Which, will be MUCH higher in voltage). Thus, you get your spark. reduce the voltage to the primary (weak magnet, low rpms), and the resultant spark is "weaker". Increase the RPM's, and the KE increases, and the spark is sufficient to run the tractor. Hard as the hubs of heck to start though.
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