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本帖最后由 shjkl 于 2022-9-20 08:58 编辑
另外,既然提到马达,我没记错的话,马达也是线圈经过电流产生磁场产生的运动。属于电流驱动和用电压驱动器驱动根本就不是一个概念。
再回到喇叭看看这段话
“Today, all commercially available audio amplifier and loudspeaker equipment works on voltage drive principle without significant exceptions. This means that the amplifier acts as a voltage source and therefore exhibits low output impedance. Thus, the amplifier as though forces the voltage across the load terminals to follow the applied signal without any regard to what the current through the load will be.
However, both technical aspects and listening experiences plainly indicate that voltage drive is the wrong choice if sound quality is of any importance. The fundamental reason is that the vague electromotive forces (EMF), that are generated by both the motion of the voice coil and its inductance, seriously impair the critical voltage-to-current conversion, that in the voltage drive principle is left as the job of the loudspeaker.
The driving force (F), that sets the diaphragm in motion, is proportional to the current (i) flowing through the voice coil according to the formula
F = Bli
where the product Bl is called force factor (B = magnetic flux density; l = wire length in the magnetic field). B is the flux density that exists when the current is zero. (The current always causes its own magnetic field, that may react with adjacent iron, but the effect is not related to this equation.) This force, then, determines the acceleration (a) of the diaphragm, that in the main operation area is given by the Newtonian law F = ma and which determines the pressure radiated.
The most remarkable thing here, regarding loudspeakers, is that the voltage between the ends of the wire does not appear anywhere in these equations. That is, a speaker driver obeys only and solely current, not minding what the voltage across the terminals happens to be.”
电流驱动器件用电压驱动来驱动,那是需要转换的,也就是电压转电流(响应的是电流而不是电压),再由电流转运动,目前普遍生产的扬声器都是以电压驱动下测得曲线结果,但这是经过转换所得结果,那有没有专门以电压驱动下测得结果的扬声器,据我从外文了解到是有的,但是并没有流行起来。 |
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