What's wrong with the high-temperature ring mirror cooling fan not rotating

Heat dissipation fans are often used in high temperature environments to reduce product temperature rise and maintain stable product performance. In high temperature environments, heat dissipation fans are also easy to stop running. What is the reason for this? There are several main reasons for this
The cooling fan uses oil bearing to operate at high speed in a high-temperature environment. The oil dries up quickly, and the accumulated dust blocks the inner hole of the bearing, making the cooling fan unable to rotate
The temperature is too high, and the cooling fan chip is damaged, making it impossible to drive the motor to run
For high-temperature products, Jingyangda Technology suggests that customers adopt a dual ball bearing+high-temperature chip design, which will improve their high-temperature resistance to a certain extent