PWM Frequency for brushless motor??

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hameeds01

Joined: 23 Aug 2005
Posts: 308
Helped: 15
Location: NUST Islamabad

31 Oct 2009 18:54 PWM Frequency ??

hello guys
I'm using PWM to control the speed of a DC 12v Brushless 0.5A fan, I need a linear behavior so how much PWM frequency should I select ??

Prototyp_V1.0

Joined: 03 Apr 2007
Posts: 156
Helped: 23
Location: Norway

31 Oct 2009 20:12 Re: PWM Frequency ??

hameeds01 wrote:

hello guys
I'm using PWM to control the speed of a DC 12v Brushless 0.5A fan, I need a linear behavior so how much PWM frequency should I select ??

Everything between 1kHz to 20kHz should work fine. But you need to filter the output foltage because of brushless fans have built in electronics to drive the motor.
However some fans supports pmw input, but you shouldn't count on that

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saeed_pk

Joined: 20 May 2006
Posts: 199
Helped: 5
Location: Islamabad, Pakistan

01 Nov 2009 8:21 PWM Frequency ??

the frequency should be given on Fan's specification if not do not drive on high frequency it may generate harmonics and that will be physically derate the motor