STM32F4 Sine wave

[phuocnguyenhuu96]

Does anyone already have been generate three sine wave using stm32f4?

[Tesla DeLorean · Accepted solution]

Only has two DACs

[T J]

use an external Quad DAC,

the easiest interface I ever did

only took 10 minutes before it worked.

[T J]

use an external Quad DAC,

the easiest interface I ever did

only took 10 minutes before it worked.

[T J]

use an external Quad DAC,

the easiest interface I ever did

only took 10 minutes before it worked.

[phuocnguyenhuu96]

Thank you. But as I understand your answers, we just could generate TWO sine wave with TWO DACs? I need THREE sine wave for control 3 phase AC motor.

[T J]

what speed do you need in RPM ?

You need 3 Dacs for 3 sinewaves...

[phuocnguyenhuu96]

Thank you for your reply. I need about 3000rpm. So can I use 3 DACs for generate sinewave? In addition, can I generate 3 sinewave use DACs with PHASE SHIFT (120 degrees).

[T J]

Yes of course.

so you need a Sine wave in Flash, and feed it to the DAC at the right time

if your sine wave hast 8 steps, ( which is not much of a sine wave)

how many poles does the motor have ?

3000 x 60 x Poles x 8 points(in Sinewave)

guessing 2 or 3 poles...

that's a feed rate of 2.8MHz per channel... if you want 16 bit, double that.

that is going to be difficult for a veteran.

This seems a stretch from being practicable.

there are other methods of driving motors, maybe some more research is needed.

[phuocnguyenhuu96]

Thank you TJ. Your information really useful for me. And yes, there's difference method of driving AC motors, but I want to practice the simple method, is Vf control or Scalar control. I already have been made that with dsp kit of TI, but for ARM, the problem is I don't know how to generate 3 phase sine wave. That's why I post it to this forum.

Again thank you for your share.