Originally posted by Turion
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I learned Lorentz long before wikipedia was invented. Actually wikipedia does a decent job with it. Please read it.
The Lorentz force in the axial gap rotary dynamo is a result of the interaction of the radial component of the armature current with the axial flux and acts in the tangential direction opposing motion. Actually motion is not required. However the Lorentz force will be in a direction to oppose rotation if the dynamo is used as a generator and in a direction to cause rotation if used as a motor.
Pretty simple. Thanks for asking.
bi
BTW. It is extremely simple to demonstrate on your bench, as you are fond of. Just lay a wire on top of a magnet, one pole pointed up. Touch flexible wire leads momentarily to low voltage battery causing a quick current to rush through the wire section laying on the magnet. Notice movement of the wire. Reverse polarity, wire moves opposite direction. Flip magnet upside-down, wire moves opposite way. Try it.
Photo attached. I just did it on my bench. Took 2 minutes.
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