Self-adhesive coils behind the balance and direction
When the self-adhesive coil device on the floor, and a hearing aid wearer issitting or standing, in the loop in the magnetic lines of force, the height of the head to the level of the main. So, in the head height, the vertical part of self-adhesive coil magnetic field have an almost continuous almost cover all the room. Just into the circuit is an exception, where, in addition to the vertical part is very weak, all self-adhesive coil magnetic field are strong. The abovecharacteristics is very important, because in a hearing aid device to receive the self-adhesive coils is vertical to the vertical part, it only can pick up themagnetic field.
The linear current magnetic field is expanded from the current heading for generating a magnetic field, self-adhesive coil magnetic field direction issurrounded by some closed curve current, the magnetic lines of force and the resulting flux, is located some current perpendicular to the plane of the concentric circle, is around their current occurred in annular flow. Close to thecurrent place of self-adhesive coil magnetic field is strong, far from current,magnetic force and magnetic flow becomes weak. With the right hand spiralrules to determine a relationship can be self-adhesive coils magnetic lines of force direction and current direction. Will the right hand holding the wire,thumb unbend, if the thumb represents the direction of the current, the magnetic field around the direction of bending fingers represent.
Here has been discussed along the loop current in one direction, but the sound is the audio signal, positive and negative pressure corresponding to theoriginal sound waves in the direction reverses many times per second.Therefore, self-adhesive coil magnetic field of cycles per second will beoverturned many times. In fact, according to the theory of electromagnetic field, it is constantly changing magnetic flux to make the pickup coil perception,occurrence of an audio current.
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