The electric speaker is also called a dynamic coil speaker; it is an electro-acoustic transducer using the electric principle; it is the most widely used and widely used speaker. There are three main reasons for this:
1. The electric speaker has a simple structure, is easy to produce, and does not require a large space itself, resulting in a low price and can be widely popularized.
2. This type of speaker can achieve excellent performance and obtain a uniform frequency response in the mid-band.
3． In the continuous improvement of this type of speaker, the decades of speaker development history is the history of continuous improvement in speaker design, technology, and materials, as well as the history of performance advancing with the times.
Electric speakers are mostly cone-shaped and dome-shaped; the structure of cone speaker.
The structure of the cone speaker can be divided into three parts:
1.Vibration system includes diaphragm, voice coil, centering support, dust cover, etc.
2. Magnetic circuit system includes magnetically permeable upper plate, magnetically conductive post, magnetically permeable lower plate, magnet, etc.
3. Auxiliary system includes basin stand, blank holder, terminal block, and phase plug.
According to Faraday's law, when a current-carrying conductor passes through a magnetic field, it receives an electromotive force in a direction consistent with Fleming's left-hand rule. The direction of force and current and magnetic field are perpendicular to each other. Directly proportional. When an alternating audio current is input to the voice coil, the voice coil is subjected to an alternating driving force to generate an alternating motion, which drives the paper cone to vibrate and repeatedly push the air to make a sound.