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Some common sense points to keep in mind when selecting a cooling fan.

Category:

Industry Trends

Release time:

2019-12-23

I. Selection and Purchase Cooling fan General common sense:
When purchasing a fan, you should generally be aware of the following information:
1. The size of the fan.
2. Determine whether the fan is DC or AC.
3. Fan power supply voltage values. For example: AC 220V, 110V, 380V; DC 5V, 12V, 24V, 36V, 48V.
4-fan, ball, or oil-bearing configuration.
The airflow and rotational speed of the fan—for example, how many cubic meters per minute, or how many cubic feet per minute.
6 Wind pressure value.
Second, regarding bearings:
Sliding bearing
In the conventional design of DC brushless fan motors, the fan blade rotor (hereafter referred to as the rotor) and its shaft pass through oil-lubricated bearings and sleeve bearings, respectively. These bearings are pivotally mounted at the center of the motor stator, ensuring an appropriate air gap between the rotor and the stator. Of course, there must be a clearance between the shaft and the bearings to prevent the shaft from becoming jammed and rendering the motor inoperable. After power is applied, the stator—part of the motor’s structural assembly (hereafter referred to as the stator)—generates induced magnetic flux lines between the rotor and the stator. The control circuit then drives the motor to operate. Thus, the conventional fan motor structure comprises only one fan blade rotor, one motor stator, and one drive circuit, all interconnected via a pivotal connection between the shaft and the bearings, enabling operation through magnetic field induction.
1. Advantages: Oil-lubricated bearing
A. Resistant to external impacts, with minimal damage during transportation;
B. Low price (the price differs significantly compared to ball bearings).
2. Disadvantage: Oil-lubricated bearing
A. Due to the operation of the fan motor, dust in the air will be drawn into the motor’s iron core and mixed with the lubricating oil stored around the bearings, forming sludge. This will increase operating noise and may even cause the motor to jam.
The bearing inner diameter is prone to wear, resulting in a short service life.
C. Cannot be used on portable products;
D. The bearing has a small clearance with the shaft core, resulting in poor motor starting performance.
E. During motor operation, the high-temperature gases generated by friction between the shaft core and the bearings are blocked by oil rings and washers at both ends of the bearings, preventing their removal and leading to the formation of nitrides. These nitrides tend to become trapped in the gap between the shaft core and the bearings, thereby hindering the smooth operation of the motor.
Ball bearing
1. Advantages of using ball bearings
A. The metal beads operate via a single point of contact, making activation easy;
Portable products that can be operated and used at different angles and orientations (but must be protected against dropping or falling);
C. Has a long service life (compared to oil-lubricated bearings).
2. Disadvantage: Equipped with ball bearings
A. The bearing structure is quite fragile and cannot withstand external impact forces;
(b) When the motor rotates, the rolling of the metal beads produces greater noise;
C. The price is high and cannot compete with the cost of oil-containing products;
D. Source and quantity requirements for ball bearings, as well as their difficult-to-control nature;
E. The ball bearings are positioned due to the elasticity of the spring, and the spring exhibits greater elasticity during assembly.

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