Variable-frequency axial flow fan

Abstract

The invention relates to a variable-frequency axial flow fan. The variable-frequency axial flow fan is composed of a fan frame, a middle cover frame, a fan impeller, a solenoid, a PCB (Printed CircuitBoard), an ARM chip, a support skeleton, an iron core body and a permanent magnet. The variable-frequency axial flow fan is characterized in that an axial flow fan body, a permanent magnet brushlessdirect current motor and a controller are integrated, the phase angle of the motor is detected by four Hall position sensors which form 90-degree angles with each other, the pulse frequency is adjusted by the ARM chip, different duty ratios of PWM (Pulse-Width Modulation) are controlled, and mechanical and electronic integration is realized by the middle cover frame, the fan impeller, the PCB andthe support skeleton. The variable-frequency axial flow fan has the advantages of reasonable, fine and simple structural design and convenience in large-scale production, and the performance and reliability of the variable-frequency axial flow fan are greatly improved. The variable-frequency axial flow fan can be widely applied to cooling high-power electronic equipment, central processing units (CPU) or power heaters.

Description

technical field [0001] The invention relates to a fan product, in particular to a mechanical and electrical integrated frequency conversion axial flow fan. Background technique [0002] Axial flow fan is a kind of fan whose gas flows parallel to the rotation axis of the fan. Its main feature is that it does not change the flow direction of the air medium. It is usually used in occasions with large air volume and low resistance, such as high-power electronic equipment and central processing unit CPU. Or heat dissipation and cooling of power heating devices. [0003] The driving source of traditional axial flow fans usually adopts AC and DC dual-purpose series-excited motors. Due to the internal brushes and mechanical commutator mechanism of this type of motor, it is inherently deficient, and it is particularly easy to be damaged by carbon deposits. Therefore, the brushes must be replaced and maintained regularly. ; In terms of energy saving and consumption reduction, the ser...

AI Technical Summary

Problems solved by technology

[0005] However, there are still some obstacles in the permanent magnet brushless DC motor driving the axial flow fan. First, the permanent magnet brushless DC motor cannot work by itself and needs an external controller to operate. Technically, it is divided into the air supply mechanism of the axial flow fan. (also known as the axial flow fan body), permanent magnet brushless DC motor and controller, the installation and wiring are very complicated, especially how to miniaturize and flatten it, which makes engineers hesitate; secondly The permanent magnet brushless DC motor often drives the fan blades by rotating the shaft. This output structure is popular, resulting in limited topological space.

Images