What type of motor is generally used to run a computer case fan?

Could anybody that deals with computers a lot tell me what type of motor is most popular for computer case fans?





I have seen DC brushless on a couple different computers, but I want to know if that is generally the case. Also, if you could give me a reason why a certain type of motor is used, that would be a bonus.





Thanks!

What type of motor is generally used to run a computer case fan?
DC brushless is the most common type used. It is quiet, and has no tendencies to produce noise signals that could interfere with the computer's operation.
Reply:In the 1980s and 1990s, PC cooling fans used a 2-phase motor because the area available for the motor in fan designs was larger and the cost of the control circuits was minimal. The first 1-phase fans were introduced in the late 1990s. The 1-phase motor is actually a 2-phase motor driven by a full bridge.


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