DC Fan Manufacturer states that a DC fan is a heat dissipation device that uses direct current to drive the fan blades to rotate, and is widely used in fields such as electronic equipment, computers, industrial machinery and household appliances.

Its core usually adopts a DC brushless motor, which converts electrical energy into mechanical energy through the principle of electromagnetic induction.

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I. Structural Classification (By Bearing Type)
Sleeve Bearing
Low cost, low noise; short service life, abnormal noise after long-term use, oil leakage
Suitable for: Low-cost, short-time operation equipment
2 Ball Bearing (Commonly Used in Industrial Scenarios)
High temperature resistance, high rotating speed, ultra-long service life, vibration resistance
Suitable for: Industrial control, server cabinets, outdoor scenarios, 24/7 continuous operation
Hydraulic / Magnetic Levitation Bearing
Ultra-low noise, medium to long service life; applied in high-end household appliances and medical equipment
II. Common Faults & Causes
1. Failed to start / Difficult to start
Insufficient power supply, broken wiring, burnt driver board, bearing jammed by dust, locked rotor caused by long-term dust accumulation
2. Abnormal noise, buzzing sound, severe vibration
Dry lubrication of sleeve bearing, dust ingress, deformed fan blade, resonance caused by insecure installation
3. Unstable rotating speed (sudden speed up and down)
Abnormal PWM signal, voltage fluctuation, faulty temperature control probe
4. Reduced airflow, poor heat dissipation performance
Airflow blockage caused by dust accumulated on fan blades, bearing wear and slipping