1. What is magnetic fluid
Magnetic fluid (also known as ferrofluid or ferrofluid) is a brown-black liquid magnet formed by uniformly suspending magnetic particles about 10 nanometers in diameter in a synthetic oil carrier.
2. A Brief History of Magnetic Fluids
Magnetic fluid came out with a mysterious color. It had been classified as highly classified. In order to solve the problem of liquid rocket fuel flow and control in the weightless state of the space program, the ferrofluid technology was developed. Magnetic-fluid technology was lifted after solid-fuel rocket technology matured and replaced liquid rockets. After more than 30 years of development, ferrofluid has been widely used in PA loudspeaker manufacturing, stepping motors, large power transformers, audio and video tape manufacturing, computer hard disk and floppy disk manufacturing, etc.
3. The effect of magnetic fluid
Adding ferrofluid to the gap formed by the speaker T iron and Weiss will significantly increase the bearing capacity of the speaker and prolong the life of the speaker. Generally speaking, the bearing capacity of a loudspeaker is limited by the heat resistance of the voice coil. The greater the power, the greater the heat generated, causing the voice coil temperature to rise sharply. The voice coil will burn out. However, the thermal conductivity of the magnetic fluid is much greater than that of the air, and the thermal energy can be dissipated into the air through the T iron, filigree, and basin frame, thereby preventing the voice coil from being burned, delaying the aging of the voice coil material and adhesive, thereby prolonging the life of the speaker.
Improved frequency response characteristics and reduced distortion. Magnetic fluid has damping properties, and the speaker has a peak on the frequency response curve near its resonant frequency (f0), which is distorted due to the excessive amplitude of the diaphragm. This is a flaw that manufacturers of speakers hope to overcome. The frequency response curve of the loudspeaker at f0 can be smoothed by using the damping effect of the magnetic fluid with appropriate viscosity on the movement of the voice coil. Therefore, the frequency response characteristics are improved, and the design of the frequency divider circuit is facilitated. The magnetic fluid has a centering function, which can prevent the voice coil from rubbing a lot.
