A good example of an induction rechargeable product is where the energy is produced by the movement of a مغناطيس through a coil, thus illustrating Faraday’s law. No battery either rechargeable or not, therefore no waste or chemicals: a nice green ecological product
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The design
The product has a very interesting construction: except for the lens and the closing cap, all the components are not mounted on the main body, but on an internal removable chassis, making assembly or repair a breeze.
From our tests, the chosen magnet is very weak. A low-cost sintered magnet, with a minimal silver-like painting on it. Likely to delay its mechanical degradation & to look nice as the flashlight body is transparent
Two rubber bumpers on the extremities of the magnet path smooth the end of the moments & protect the plastic parts and the magnet from destruction.
The switch is made from a sliding small plastic knob, pushing a metal plate welded on the PCB underneath.
A single LED -old style now=not SMD- is creating the main light, while a reflective metal sheet on the bottom limits light losses.
A small battery -likely NiCd- to allow it to be emptied completely without being damaged, on the other side of the PCB holds the current produced. 4 diodes ensure a correct polarity for the battery as for the LED.
The small details that ease the magnet induction function:
- one hole at each end of the chassis to avoid trapping some air during the magnet movement
- some shape in the plastic to avoid a full circular friction contact with the magnet that would slow it down
note: a transparent body or at least a window is a must in such a product, to clearly instruct the user to move the magnet.
A nontransparent body would give the impression that something is broken and free-floating inside, especially if the flashlight is not recharged and does not light.
خاتمة
A traditional product, very modern in the ecological sense, in its low-cost version, but still with a nice construction -the chassis- and performing well for such a price.
Such a product needs a robust mechanical design, but to work very efficiently,
needs a very fine-tuned extremely low-current المكوّن الإلكتروني choices
(a diode driving too much current or a bad battery will ruin the system or require the user to shake his flashlight continuously)
Note that such induction can be calculated and simulated
Among others, software like COMSOL Multiphysics: coil calculation project example can simulate and calculate the induction a moving magnet produces within a coil.
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