Comments on: What is the volt and amperage of a typical lawnmower plug? http://www.qualitylawnmower.com/blog/what-is-the-volt-and-amperage-of-a-typical-lawnmower-plug/ Thu, 17 May 2012 16:40:26 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Numbat http://www.qualitylawnmower.com/blog/what-is-the-volt-and-amperage-of-a-typical-lawnmower-plug/comment-page-1/#comment-102 Numbat Sun, 25 Jan 2009 19:02:24 +0000 http://www.qualitylawnmower.com/blog/what-is-the-volt-and-amperage-of-a-typical-lawnmower-plug/#comment-102 Very rare to have a magneto in modern small engines. Usually, the electrics use a CDI system where two coils are held near the flywheel which has a magnet embedded in it. The first coil is used to charge a capacitor and the second coil is used to trigger a SCR to rapidly discharge the capacitor through a coil/transformer. It is the rapid discharge that creates the spark. Unlike a magneto, no points are involved. Intrinsic Voltage produced by the CDI system is somewhat variable since it depends on the capacitor charge which varies with engine RPM. However the actual voltage is set by the gap of the spark plug since the voltage can not rise higher than the arc-over point. The current is very small (and the voltage is high which will give problems with insulation). It would not be practical to power an electromagnet. Very rare to have a magneto in modern small engines. Usually, the electrics use a CDI system where two coils are held near the flywheel which has a magnet embedded in it. The first coil is used to charge a capacitor and the second coil is used to trigger a SCR to rapidly discharge the capacitor through a coil/transformer. It is the rapid discharge that creates the spark. Unlike a magneto, no points are involved.

Intrinsic Voltage produced by the CDI system is somewhat variable since it depends on the capacitor charge which varies with engine RPM. However the actual voltage is set by the gap of the spark plug since the voltage can not rise higher than the arc-over point.

The current is very small (and the voltage is high which will give problems with insulation). It would not be practical to power an electromagnet.

]]> By: billrussell42 http://www.qualitylawnmower.com/blog/what-is-the-volt-and-amperage-of-a-typical-lawnmower-plug/comment-page-1/#comment-101 billrussell42 Sun, 25 Jan 2009 16:53:11 +0000 http://www.qualitylawnmower.com/blog/what-is-the-volt-and-amperage-of-a-typical-lawnmower-plug/#comment-101 This is, I think, high voltage pulses, with a rep rate tied to the engine's rotation speed. Be difficult to design a transfromer to run from these conditions. Specially if the engine speed is changing. Actually, probably not possible... This is, I think, high voltage pulses, with a rep rate tied to the engine’s rotation speed. Be difficult to design a transfromer to run from these conditions. Specially if the engine speed is changing.

Actually, probably not possible…

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