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How to recharge electric toothbrushes if not have contacts?
Inductive coupling employs magnetic fields which form an inherent part of the current flowing through a wire. Whenever an electric current moves through a cable, magnetic field formed around it. If we bend the wire into a coil or solenoid, amplify the magnetic field, so the more turns holding the coil, the greater its field.
If we have a second coil in the magnetic field that we have made, the field will induce a current in the wire. This is the basic way in which it operates and a transformer is the procedure used in recharging an electric toothbrush, which has no metal contacts on the base, employing magnetism. Thus, the plug current flowing through the coil that is inside the magazine and insert the brush base where during charging, and creates a magnetic field. In this is called a transformer primary winding.
When depositing electric toothbrush in the charger, the changing magnetic field induces an alternating current in the other coil (secondary coil) inside the brush, which connects to the battery. This current charges the battery by the electromagnetic induction. You can use the same basis for charging multiple devices at once. Electronic devices and employ its appropriate receptors developed internally or connected separately to recharge, provided they are placed in its cradle. These receptors comprise compatible coils and the circuitry required to supply electricity to the batteries of the devices.
Electromagnetic induction was discovered by Michael Faraday in 1831 and was subsequently developed by Heinrich Lenz in 1834, enacting the Act Lenz-Faraday. This law says that the temporal variation of the magnetic field flux which crosses the surface is bounded by a conductor loop, in this coil induces an electrical current. Electromagnetic induction is the fundamental principle of the electric generator, transformer and many other everyday devices.
Here's a toothbrush inside. The video is in English, but is a graphical way to view the operation and component parts inside.
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