Start-up voltage and dead angle problem

Know the fan startup voltage:

What factors affect the starting voltage? The starting voltage means the minimum operating voltage of the fan, which is a characteristic of comparing the advantages and disadvantages of the fan. Usually, the fan with a lower net friction coefficient and a Hall IC with a lower working voltage can start the fan at a lower voltage.

Factors that affect the fan start-up voltage include:

1. Whether the winding design is appropriate. 2. The size of the hysteresis loss of the silicon steel sheet. 3. The minimum operating voltage of the Hall IC.

4. Magnetizing strength of rubber magnet. 5. The weight of the fan blade. 6. The friction coefficient of the bearing is high or low.

7. Whether there is a reverse protection diode. 8. Transistor magnification level. 9. Transistor saturation voltage level.

Recognize the dead end of the fan:

What factors cause the fan dead angle? The so-called fan dead angle means that the fan cannot be started according to the specified voltage when it is placed at a certain angle. The test method is to adjust the poles of the fan in sequence before the Hall IC, and then slowly increase the voltage until it starts. If each pole starts before the voltage value is less than the specified value, it means it is qualified. If there is a difference in height, the starting voltage exceeds the specified value. , called the dead angle.

Factors that affect the fan start-up voltage include:

1. The magnetization of each pole of the rubber magnet is uneven. 2. The sensitivity of Hall IC is too poor. 3. The magnetizing magnetic field of the rubber magnet is too weak.