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Old 07-07-2018, 11:49 AM   #3270 (permalink)
thingstodo
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Quote:
Originally Posted by ale0502 View Post
Hi,
I understand that the pwm frecuency must be 10KHz, but on my board is about 3KHz.
My crystal is 8MHz.
What could be wrong?
Thanks
The AC Controller had an upgrade a while ago that changed the PWM frequency from constant to a sort of 'white noise' signal that makes a 'SHHHH' sound. I think the frequency varies from 2 KHz to 10 KHz to do that. But I don't know what triggers the change in PWM frequency.

Why do you think that 3 Khz is wrong? Is it not working? The PWM frequency has some effect on efficiency and motor speed control ... but as far as moving your car it should make no difference at all.

Is the noise bothering you? Does it stay at 3 KHz while you drive?

And, is it connected to a motor and driving your car, or are you still testing and it is on your work bench?
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