PWM in Cooling

[BigBoss]

Greetings all!

I wanted to know if some one heavily knowledged in Pulse Width Modulation control can explain how it works, especially in the application of, say, a FSAE coolant pump.

We currently run a PWM pump for our cooling system, and I always stumble at the concept.

Thanks!

[Loz]

Longer pulse > higher duty cycle > higher current/duty cycle > faster spinning motor > more water pumped.
In terms of DC motor control, it is very very simple...

[jlangholzj]

Originally posted by Loz:
Longer pulse > higher duty cycle > higher current/duty cycle > faster spinning motor > more water pumped.
In terms of DC motor control, it is very very simple...

if you take this concept a little bit further and apply a low pass filter to the PWM signal, you could think of the result as an average. As stated, a higher duty cycle would result in more current flow and a higher spinning motor. This of course is for a DC motor.

[TMichaels]

I can not really see any thing about PWM that is not answered by this article:
https://en.wikipedia.org/wiki/Pulse-width_modulation

[BigBoss]

Thanks TMichaels,

Didn't even consider. But I probably would have needed a different angle from wiki. Now, it makes more sense.