What Is A High-speed Fan?

We may not know much about the fan, but its application in our daily life is very extensive, especially the high-speed fan that is popular with consumers. Its remarkable features are praised by all of us, so we simply follow Let's talk about high-speed fans.

High-speed fans mostly use high-speed brushless motors. Brushless motors eliminate the need for collector rings and brushes for excitation. The structure is greatly simplified, which not only improves the manufacturability of the motor, but also enhances the mechanical reliability of operation and the service life. increase. At present, there are many ways to adjust the air volume of large-capacity fans using frequency conversion speed regulation. This type of frequency converter mainly relies on imports and is expensive. Fans with a power level below 1kw, especially those of household air conditioners, have been driven by permanent magnet brushless motors, and the speed and air volume adjustment method is adopted. Fans with a power range of 1~10kw have a huge amount of consumption. They are basically driven by induction motors, and the air volume is adjusted by adjusting the opening of the air outlet. For fans in this power range, the use of permanent magnet brushless motor drive to replace the original induction motor drive has great advantages.

High-speed fans have the following advantages:

Low loss and high efficiency: Because of the use of permanent magnet excitation, the loss caused by the excitation current of the induction motor is eliminated; at the same time, the permanent magnet brushless DC motor works in a synchronous operation mode, eliminating the frequency loss of the rotor core of the induction motor. These two aspects make the operating efficiency of the permanent magnet brushless DC motor much higher than that of the induction motor, and the efficiency improvement of the small-capacity motor is more obvious.

High power factor: Since the excitation magnetic field of the high-speed fan does not require the reactive current of the grid, its power factor is much higher than that of the induction motor. Compared with the induction motor, the brushless motor has higher efficiency and power factor at the rated load. It is more advantageous at light loads. Compared with the variable frequency speed regulation of the induction motor, the speed regulation control of the brushless DC motor is not only simple, but also has better speed regulation performance.

Low inverter capacity: high-speed fans require rectangular wave current, and the current rating of the inverter when it runs continuously refers to the peak value of this rectangular wave. Induction motors require a sine wave current, and the current rating of the inverter during continuous operation generally refers to the rms value of this sine wave. In order to maintain the control ability of the inverter to the motor current, there should be a sufficient difference between the DC voltage of the inverter and the induced electromotive force of the motor. Therefore, the peak values of the trapezoidal wave induced electromotive force of the brushless DC motor and the sine wave induced electromotive force of the induction motor are both limited by the DC voltage of the inverter.

To sum up, we can see that the high-speed fan is characterized by low loss, high efficiency and high power factor, especially its low inverter capacity, which is different from other fans. Overall, the high-speed fan is a very good product now, it is worth We buy with confidence.