Electric toothbrush charging coil
The quality factors of electric toothbrush coils are:
Q=L/R, where:
-- operating angular frequency;
L -- coil inductance;
R - The total loss resistance of the coil The total loss resistance of the coil is composed of DC resistance, high frequency resistance (caused by skin effect and proximity effect) dielectric loss.
In order to improve the quality factor Q of the hollow inductor of the electric toothbrush, silver plated copper wire can be used to reduce the high frequency resistance. Use multiple strands of insulated wire instead of a single wire of the same length to reduce skin effect; High frequency porcelain with low dielectric loss is used as the skeleton to reduce dielectric loss. Although the use of magnetic core increases the loss of magnetic core, it can greatly reduce the number of coil turns, thereby reducing the DC resistance of the wire, which is conducive to improving the Q value of the coil.
Choosing a reasonable hollow inductor size can reduce the loss of a single layer coil with a certain outer diameter (20mm-30mm), and the loss is minimum when the ratio of winding length L to outer diameter D is L/D=0.7. A multi-layer coil of a certain outer diameter, L/D=0.2-0.5, when T/D=0.25-0.1, its loss is minimal.
The use of magnetic core in the electric toothbrush coil reduces the number of turns of the coil, not only reduces the resistance value of the coil, but also helps to improve the Q value and reduce the volume of the coil.
Under the condition that winding thickness t, winding length l and outer diameter d meet 3t 2l=d, the loss of electric toothbrush coil is also minimal. Coil with shield preferably L/D=0.8-1.2.
The wireless electric toothbrush coil comprises a box, a fixed plate, a support rod, a coil mechanism and a support mechanism, the coil mechanism comprises a coil body, an inner ring, a resonant capacitor, a resistor and a paper separator, and the support mechanism comprises a support frame, a threaded ring, a threaded sleeve, an opening and an armrest column. Through the double winding coil body, the electromagnetic field is enhanced, and then the resonance is adjusted by the resonant capacitor, so that the vibration frequency is equal and the electromagnetic field is maximized, and the battery is charged by the magnetic resonance, which greatly maximizes the electric energy converted by the electromagnetic field. Through the bracket mechanism, the toothbrush is placed in the bracket mechanism, by adjusting the height of the screw sleeve to change the size of the screw sleeve, which can make the different sizes of the toothbrush stable on the bracket mechanism, the water outlet on the groove can keep the water on the toothpaste drain, reduce the danger, and the bracket mechanism also improves the practicality.
Custom electric toothbrush coil
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