Working principle of electric speaker: The electrodynamic speaker is also called dynamic coil speaker; it is an electroacoustic transducing device applying electrodynamic principle; it is currently the most widely used and most widely used speaker. There are three main reasons: 1. The electric speaker has a simple structure, is easy to produce, and does not need a large space itself, resulting in a cheap price and can be widely popularized. 2. This type of speaker can achieve excellent performance, and can obtain a uniform frequency response in the middle frequency band. 3. The continuous improvement of this type of speaker, the history of decades of speaker development, is the history of continuous improvement of speaker design, process, and material, and the history of performance with the times. The shape of electrodynamic speakers is mostly tapered and dome-shaped; the structure of cone speakers. The structure of the cone speaker can be divided into three parts: 1> Vibration system includes diaphragm, voice coil, centering piece, dust cover, etc .; 2> Magnetic circuit system includes magnetically conductive upper plate, magnetically conductive column, magnetically conductive lower plate, magnet, etc .; 3> Auxiliary systems include basin racks, blank holders, wiring racks, and phase plugs. According to Faraday's law, when a current-carrying conductor passes through a magnetic field, it will receive an electric force. Its direction is in accordance with Fleming's left-hand rule. The force is perpendicular to the direction of the current and the magnetic field. Proportional. When an alternating audio current is input to the voice coil, the voice coil is subjected to an alternating driving force to produce an alternating motion, which causes the paper cone to vibrate and repeatedly push the air to sound. The force that vibrates the diaphragm of the electric speaker is the force of the magnetic field on the current-carrying conductor. This effect is called the force effect of the electric transducer. Its size is specified by the following formula: F = BL i In the formula: B is the magnetic induction density (strength) in the magnetic gap, and its unit is N / (Am) <Newton / (Amp. Meter)>, also known as Tesla (T) L is the length of the voice coil wire, unit: meter i is the current flowing through the voice coil, unit: ampere F is the force of the magnetic field on the voice coil, unit: Newton However, when the energized voice coil is forced to move, it will cut the magnetic force lines in the magnetic gap to generate an induced electromotive force in the voice coil. This effect is called the electric effect of the electric transducer. The magnitude of the induced electromotive force is : е = Вiν Where: v is the vibration speed of the voice coil, the unit is: m / s е is the induced electromotive force in the voice coil, the unit is: volt The force effect and electric effect of the electrodynamic loudspeaker exist at the same time and accompany each other. Working principle of other speakers: <1> Magnetic speaker: Also known as "reed speaker", its structure is shown in Figure 4, there is a movable iron core electromagnet between the two poles of the permanent magnet, when there is no current in the coil of the solenoid, the movable iron core Attracted by the phase attraction of the two poles of the permanent magnet, it stays still in the center; when current flows in the coil, the movable core is magnetized and becomes a bar magnet. As the direction of the current changes, the polarity of the bar magnet also changes accordingly, so that the movable core rotates around the fulcrum, and the vibration of the movable core is transmitted from the cantilever to the diaphragm (paper cone) to promote the thermal vibration of the air. <2> Electrostatic speaker: It is a speaker that works by using the electrostatic force applied to the polar plate of the capacitor. In terms of its structure, it is also called a capacitive speaker because the positive and negative electrodes face each other to form a capacitor. As shown in the figure, there are two thick and hard materials as fixed plates, which can transmit sound, and the middle plate uses a thin and light material as a diaphragm (such as an aluminum film). Fix and tighten the periphery of the diaphragm to maintain a considerable distance from the fixed pole. Even on the large diaphragm, it will not touch the fixed pole. The original DC voltage between two electrodes (called bias). If the audio voltage output by the amplifier is added between the two electrodes, it overlaps with the original output voltage to form an alternating pulsating voltage. This pulsating voltage is generated by the change in the attractive force of the gap between the two poles, and the diaphragm vibrates and sounds. The advantages of electrostatic speakers are that the entire diaphragm vibrates in phase, the diaphragm is light, and the distortion is small. It can reproduce extremely crisp sound, with good resolution, clear details, and realistic sound. Its shortcomings are low efficiency, high-voltage DC power supply is required, easy to vacuum, the increase of the diaphragm distortion will also increase, not suitable for listening to rock, heavy metal music, the price is relatively expensive. <3> Piezoelectric speakers: Speakers that use the inverse piezoelectric effect of piezoelectric materials are called piezoelectric speakers. The dielectric (such as quartz, potassium sodium tartrate and other crystals) is polarized under the pressure to cause a potential difference between the surfaces of the two ends, which is called the "piezoelectric effect." Its inverse effect, that is, the dielectric placed in the electric field will elastically deform, is called "reverse piezoelectric effect" or "electrostriction". Compared with electrodynamic speakers, piezoelectric speakers do not require a magnetic circuit, and do not require bias voltage compared with electrostatic speakers. The structure is simple and the price is low. The disadvantage is that the distortion is large and the operation is unstable. <4> Ionic speakers: Under normal conditions, the molecular weight of air is neutral and uncharged. But after high voltage discharge, it becomes charged particles, this phenomenon is called dissociation. The vibration of the ionized air with audio voltage generates sound waves. This is the principle of ion speakers. In order to ionize, it is necessary to add a high-frequency voltage of 20MHz, and the audio signal piezoelectric is superimposed on it. It can be seen that the ion speaker is composed of a high-frequency oscillation part, an audio signal modulation part, a discharge cavity and a horn. In the discharge chamber, a quartz rod with a diameter of 8 mm is opened in the center to form a quartz tube, and one electrode is inserted into it. The other electrode is shown as a cylindrical sleeve outside the quartz tube. Due to the silent discharge form, only the center The needle electrode is worn, and the center electrode can be replaced regularly. The difference between ion speakers and other speakers is that they have no diaphragm, so the transient characteristics and high-frequency characteristics are very good, but the structure is too complicated. <5> Flame speaker: When the flame of air and gas burning passes through the electrode, DC voltage and high frequency signal are added to the electrode, and the flame is modulated by the audio signal to sound. The flame has almost no quality and the sound dynamics are excellent. But it has fatal disadvantages: unsafe and inconvenient. <6> Airflow modulation speaker: also known as airflow speaker. It is a loudspeaker that uses compressed air as an energy source and uses audio current to modulate airflow. It consists of air chamber, modulation valve, horn and magnetic circuit. The compressed air flow passes from the air chamber through the valve and is modulated by the external audio signal, so that the fluctuation of the air flow changes according to the external audio signal. At the same time, the modulated air flow is coupled through the horn to improve the efficiency of the system. It is mainly used as a sound source for high-intensity noise environmental tests or long-distance broadcasting. 〈VII〉 Magnetic distortion speaker. This is a special strong magnet, which can vibrate and sound under the action of a magnetic field.
Washing machines are very common in every family. Banshen washing machines, with high quality, good design and best service. Many products have been sold to over 30 countries. After many years of developing, banshen washing machines are getting better and better.
Our well-equipped facilities and excellent quality control throughout all stages of production enable us to guarantee total customer satisfaction. Besides, we have received CE, CB, RoHS and CCC certifications.
As a result of our high quality products and outstanding customer service, we have gained a global sales network reaching America, Asia, Europe, Africa, the Middle East and other countries and regions.
If you are interested in any of our products or would like to discuss a custom order, please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future.
3Kg Washing Machine,Mini Washing Machine,Mini Portable Washing Machine,Mini Washing Machine With Dryer Ningbo Banshen Electric Appliance Co., Ltd , https://www.banshendq.com