Dynamo Flashlight
Dynamo Flashlight
I haven't taken a dynamo flashlight apart yet, but I believe that the dynamo itself is actually shaped like a?
I haven't taken a dynamo flashlight apart yet, but I believe that the dynamo itself is actually shaped like a cylindrical battery.
Question 1- If the dynamo's circular edge had a diameter of 2 inches, how many watts per minute could it produce if it was really well put together, and how expensive would it be?
Question 2- If this expensive dynamo was used continuously, how long would it last- and if I paid more for it, could it ever be made to last indefinitely?- and if it's a matter of the magnets within dying, would another magnetic source nearby be able to refuel it?
Thank you!
I took a dynamo flashlight apart, it used a permanent magnet motor as a generator. The Hand Crank had 3 rows of gears to increase the crank speed to the armature shaft. A bridge rectifier is used to allow the crank to be turned either clockwise or counterclockwise and still charge the metal hydride battery. A voltage regulator is used to prevent overcharging the battery. The brushes in the dynamo are what will fail. They are cleverly designed to be made cheap. Even if the dynamo were made better the battery would be the limiting element. They can only be recharged so many times. There is nothing in the design of the one I took apart that has any overcharge protection.
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