This section provides overview, applications, and principles of dc fan motors. Also, please take a look at the list of 42 dc fan motor manufacturers and their company rankings.
A DC fan motor is a motor that rotates a fan and is driven by a DC current.
They are broadly classified into propeller fans, blowers, cross-flow fans, and other types according to their structure. But they all have one thing in common, they blow air.
All DC fan motors have different sizes, airflow rates, and characteristics, so it is necessary to check the catalog specifications to determine which one to use according to the application and purpose. The most common fan motor type is a propeller fan, so it is safe to choose a propeller fan if you are unsure which one to choose.
DC fan motors are used to cool the inside of electronic equipment such as home appliances and office automation equipment by blowing and convecting air through the rotation of the fan.
Cooling by DC fan motors can be done in two ways: by discharging internal heat to the outside or by allowing external heat to flow into the inside. Since cooling by DC fan motors is based on air convection, the most efficient method must be selected in consideration of the structure and temperature of the equipment.
The structure of a DC fan motor can be roughly divided into a casing for the structural components, a fan or runner for airflow, and a DC motor for turning the fan or runner.
In the case of a propeller fan, the direction of airflow is the same as the axis of rotation, resulting in a small size, large air volume, and relatively quiet rotation. In contrast, a blower is perpendicular to the axis of rotation, and the outlet of the airflow is narrowed to concentrate the airflow and obtain high static pressure.
In the case of cooling by a fan, airflow resistance is generated, so it is necessary to select the performance of the fan in consideration of the pressure loss due to the internal structure. In addition, when multiple fans are used to obtain the required air volume and static pressure, it is necessary to consider whether it is most efficient to use them in series or parallel. Generally, using fans in parallel increases airflow, and using them in series increases static pressure.
A typical fan structure consists of an impeller, casing, main shaft, bearings, and a shaft seal.
The impeller is the part that produces airflow and is the heart of the fan. Various types of impellers depend on the application, environment, and other factors related to the efficiency of airflow. The casing is the part that forms the outer frame of the fan itself and the inner airflow path and is the part that forms the inlet and outlet sections of the fan. The main shaft is the central axis of the fan and has the strength to support the impeller. The bearing is the part that receives the rotational motion of the spindle, smoothing and supporting its action. The bearing reduces friction and wear. If the quality of this part is poor, mechanical wear can lead to failure.
DC axial fans are DC-driven axial fans. An axial fan is a fan in which the direction of airflow is in the axial direction. It is widely used for cooling things that generate heat because the airflow is generated in the direction perpendicular to the direction of rotation of the blades that generate the airflow (axial direction). Axial fans are characterized by the fact that there is relatively little increase or decrease in airflow due to resistive objects.
In addition to axial fans, there are centrifugal fans and oblique flow fans with different airflow directions. Centrifugal fans are fans that generate airflow orthogonally to axial fans, and airflow is generated in the centrifugal direction. Also, a diagonal flow fan is a fan between an axial flow fan and a centrifugal fan. The shape of the blades cause air to be sucked in from the axial direction and pressure to be applied in the diagonal direction of the shaft, changing the exhaust direction and blowing the air. It is characterized by its small size and lightweight.
The typical fan motor for axial fans is a propeller fan. An airfoil-shaped propeller is placed inside the casing and rotated to generate airflow in the direction of the axis of rotation. Since the airflow is in the direction of the axis of rotation, it has a compact structure. A typical fan motor in a centrifugal fan is a blower. The centrifugal force of the forward-facing blades arranged in a cylindrical shape creates airflow in a direction almost perpendicular to the axis of rotation.
*Including some distributors, etc.
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