Knowledge of speaker's voice coil

The voice coil is the core part of the loudspeaker vibration system, the power, which has become an electromagnet and permanent magnet effect along the axial direction before and after motion driven diaphragms. The stroke length, power and speed of the voice coil will affect the sound quality.

From the basic voice coil bobbin [], coil wire coil, and wire lead and lead on a paper. In the voice coil work, there will be part of the electric energy conversion into heat, the temperature of the voice coil can reach a very hot degree. Therefore, the material of the winding pipe is required, must be heat resistant. Usually used is aluminum foil, aluminum foil itself can also be used for cooling. There are also used heat resistant plastic, fire paper.

The wire is not bare, it must cover the surface of insulating material. The coil is also a factor in the size of the speaker's power, the "burning trumpet" in fact is the voice coil, because the voice coil wire burn through the insulation layer and can not work. Insulation material can withstand the higher the temperature, voice coil can carry the function of the larger, so the insulation layer becomes one of the key points to improve the power, some of the speakers of the use of the XXX high temperature resistant coating, refers to the high temperature of the insulation layer.

The voice coil is suspended in the magnetic gap, and the air is a bad conductor, and the carrying capacity of the voice coil is increased, and the magnetic fluid can increase the cooling efficiency. Of course, the role of the magnetic fluid is not only heat dissipation, it can also increase the damping, the response speed of the voice coil and the sensitivity of the speakers have an impact.

It is the most simple, but the efficiency of the circle is not the highest, and the circular line can be used to make a lot of space, which means more powerful force and reaction force, which means more powerful force and reaction force can be improved. But the cost is very high, because the flat wire is difficult to process.

Depending on the speaker design, the length of the coil can be high. In many of the speakers and speakers, we often hear a word - long stroke design. Long stroke design and suspension system, but also with the voice coil, if the coil is not long enough, long stroke motion, the coil will be out of the magnetic gap, and reduce the force of the permanent magnet, resulting in a decrease in speaker control. Long stroke sound coils are usually used in the design of small and medium sized bass speakers. Larger strokes push the larger volume of air, so that low frequency is more abundant.

There are also differences in wire winding. Sound circle can be wound into a single layer, double layer, 4 layer or even multi layer, the method of winding and even around the two kinds, different winding will lead to different electromagnetic conversion efficiency, inductance will also be different, the total length of the wire will have an impact on the weight of the voice coil. It's just a simple mention, there is interest, please refer to the professional information.

Conductor materials are also different, commonly used are copper and aluminum, aluminum low density, high efficiency, but it is difficult to weld aluminum, hence the copper clad aluminum, copper wire covering film on the surface of the copper clad aluminum better balance the relationship between processing and weight material. Many manufacturers are not willing to tell everyone what is the copper clad aluminum, but mention a "CCAW", is actually the same, just CCAW look more western style some. Copper clad aluminum wire is designed on the headset speaker are used, because these speakers are very sensitive to the voice coil weight.