[TriEmbed] laptop fan motor control question

[John Vaughters]

Yup I am wrong. You can reduce voltage and modify the speed it seems, but you just have to jolt the motor to get the motor started, then adjust the speed. Then I noticed several options for some PC fan motor controllers for both 2 & 3 wire. The 4 wire are easy, they already give you a speed pwm pin.

John Vaughters






On Tuesday, February 2, 2021, 01:43:23 PM EST, John Vaughters <jvaughters04 at yahoo.com> wrote: 






Computer fans are almost always brush-less, actually never seen a brushed one. Because the electrical noise is too high. She 3 pin motors are simply two power pins plus one tachometer pin, which you generally only want to determine if the fan is failing. I could be wrong about this part, but I expect that they are single voltage and reducing the voltage may or may not affect the speed much and possibly could damage the fan over long use. However, I seem to remember some schemes to make 3 wire fans speed controlled. it's worth a look online I suppose.

John Vaughters