Sharing Of Good Performance Of DC Fans

Nowadays, most DC fans are DC brushless motors, which can eliminate the Slip ring and brush for excitation, and optimize the structure. While improving the technology of the motor, it also strengthens the mechanical reliability of the motor operation, and extends the use time of the DC fan. Moreover, it significantly improves the air gap magnetic density, achieving optimal motor design, reducing motor volume, and reducing weight. In addition, it has good control performance for other motors. This is due to the high performance of permanent magnet materials, which significantly improves the torque constant, torque inertia ratio, power density, etc. of the motor; The design of permanent magnet circuit is relatively perfect, and the Coercivity is high, so the ability of permanent magnet motor to resist armature reaction and demagnetization is greatly enhanced, and the influence of external disturbance on motor control parameters is also reduced.
Characteristics of DC fans:
1. Low loss and high efficiency. Due to the use of permanent magnet excitation, the losses caused by the excitation current of the induction motor are eliminated; Moreover, the synchronous operation mode of permanent magnet brushless DC motor can eliminate the frequency loss of the induction motor rotor core.
2. High power factor. Due to the absence of reactive current from the grid, its power factor is greater than that of induction motors, which can operate at a power factor of 1, which is very advantageous for small power motors.
3. Good speed regulation performance. Simple control. Compared with the variable frequency speed control of induction motors, the speed control of DC fans not only is simple, but also has better speed control performance.