Neodymium Iron Boron Magnetic Steel in 3C Consumer Electronics Products
http://www.magnet-forever.comWhere will neodymium iron boron magnetic steel be used in these products? What is the principle used? What are the requirements for magnets? Today, the editor will take you to answer these questions together.
There are three main modules in consumer electronics that use magnets, namely acoustic module, motor module, and magnetic attraction module.
1. Acoustic module
As the name suggests, an acoustic module is a sound unit, commonly known as a speaker. The performance of speakers has a significant impact on sound quality.
A magnetic field is generated in the electrified wire. When an AC audio current passes through the coil of the speaker (i.e. the voice coil), a corresponding magnetic field is generated in the voice coil. This magnetic field interacts with the magnetic field generated by the magnet on the speaker, and this force causes the voice coil to vibrate with the audio current in the permanent magnet magnetic field on the speaker. The diaphragm and voice coil of the speaker are connected together. When the voice coil vibrates together with the diaphragm of the speaker, it pushes the surrounding air to vibrate, and the speaker produces sound. As shown in the figure below, this is the principle of the horn.
The requirements for neodymium iron boron magnetic steel in acoustic modules of different 3C products are also different
IPhone and other mobile phone products are used frequently and have certain requirements for the weight of the phone, so high-performance (54SH) and small-sized magnetic steel are needed to achieve lightweight goals. On Mac or iPad and other computers, on the one hand, sound quality needs to be considered, and on the other hand, their volume is larger than that of mobile phones, which can utilize more space. Therefore, magnetic steel Watch with slightly lower performance (52SH) and larger volume and more diversified shapes will be used. Watch products with small volume and user demand for sound quality are generally not high, so magnetic steel with lower performance (50H) and smaller volume will be used
2. Motor module: VCM voice coil motor and linear vibration motor
The VCM voice coil motor is an important component of the AF (Auto Focus) autofocus camera module. It can drag the lens up and down to switch between near and far focus, making photography clearer. Similar to the principle of a speaker, magnetic steel provides a permanent magnetic field in the camera module, and the energized coil is subjected to force in the magnetic field, thereby dragging the lens forward and backward. Different lenses have different functions, and the shape and performance of the magnetic steel inside vary greatly.
Linear vibration motor is the main component for mobile phone products to achieve vibration function. The energized coil is subjected to an Ampere force in a magnetic field (provided by neodymium iron boron magnet), which drives the motor to vibrate. Among them, linear resonance actuator (LRA) is a type of motor widely used in smartphones, providing tactile feedback through tactile effects. The performance of LRAs directly affects the tactile experience of users. LRA is driven by alternating current, which can generate instantaneous high voltage, making the motor start and stop very quickly, and the vibration sensation follows the hand. By changing the frequency of alternating current, different vibrations can be achieved to match various mobile phone usage scenarios. The shape and performance of magnetic steel vary completely depending on the type of motor
3. Magnetic module
Magnetic attraction is the most easily understood property, which utilizes the attractive force of magnets on ferromagnetic materials. It is mainly used in various types of accessories, such as wireless charging accessories, mobile phones and watches, as well as in the closure of computer screens and the support of tablets, where magnets play a role in attracting them. These suction accessories are customized according to actual needs based on their different shapes and performance in different end products.