Dc fan precise speed control

ivan

Other Parts Discussed in Thread: DRV10866

Hello,

What would be the best way to precisely hold a dc fan (5v pc fan brushless motor) speed locked at a set speed? The speed would be controlled with a arm development board (Teensey).

I need to blow air at 3 m/s (118 in /s) into 2 tubes - U tube (diameter 12mm (0.5 inch)). Any help, product recommendation would be greatly appreciated

over 8 years ago

0 Blake TI Community over 8 years ago

TI__Guru* 92935 points

I believe this question will be better served if I move it to the Motor drivers forum.

0 Nicholas Oborny over 8 years ago

TI__Mastermind 21305 points

Hi,

You would need to implement some sort of speed sensor on the brushed dc motor and then close the loop with some sort of controller that would regulate voltage in response to speed.

Sensors include hall sensors, encoders, resolves, etc.

0 Nicholas Oborny over 8 years ago in reply to Nicholas Oborny

TI__Mastermind 21305 points

Sorry, read that as brushed DC motor, not brushless DC.

For a brushless DC motor there are drivers that can be used for speed control.

The DRV10866 is an example. It outputs an FG signal from the back-emf of the motor that can be used by an external controller to setup a speed control loop.

0 ivan over 7 years ago in reply to Nicholas Oborny

Prodigy 40 points

Ty for the response,

I was planing on using a DC PC fan with 3 wires, measuring the RPM with the tacho output , puting in a pid control loop and then controlling the speed trought a mosfet.

I'm interested do you have a chip that would hold the fan at a stable rpm, with as little as possible fluctuation. Or something that would hold the fan at a set rpm programmed by either a chip (i'm using an arm development board for now) or some other way.