I can not move the brushless motor with 50 Hz

Zek_De · Joined: 13 Aug 2016 Posts: 100

Hey friends,
I'm giving 50 Hz Pwm on ESC and no move. I just get periodic bip sound.
If I change PWM first bip stop and then again return bip.
What is wrong? PWM frequency ? My ESC is from Aliexpress.

https://tr.aliexpress.com/item/4x-2212-1000KV-Outrunner-Motor-4x-HP-30A-ESC-4x-1045-propeller-Black-Quad-Rotor/1983175325.html?spm=2114.13010608.0.0.oOAPJM

Mike Walne · Joined: 19 Feb 2004 Posts: 1785 Location: Boston Spa UK

We need a little bit more information.

For starters:-

What sort of drive does the motor require?
Which PIC/compiler are you using?
Can you show us your code?
What does your power drive look like?

I've had quick look at your link, tells me nothing.

Mike

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Are you using a PIC ? Or are you using Arduino ARM Cortex ?
I suspect the ARM. In that case, you should look at Arduino forums, etc.:
https://dronesandrovs.wordpress.com/2012/11/24/how-to-control-a-brushless-motor-esc-with-arduino/

https://forum.arduino.cc/index.php?topic=270309.0

Zek_De · Joined: 13 Aug 2016 Posts: 100

I'm using ARM stm32f4.
this is github

https://github.com/ZekDe/STM32F4xx

I m trying with PID output ,50 Hz .I didnt send codes because so long but if you want I will ...

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Zek_De · Joined: 13 Aug 2016 Posts: 100

Yes but this is general question ,but I got it ,my mistake is 50 Hz (20 ms) but ESC works 1ms and 2ms okay thanks again

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

It's not a general electronics forum. General electronic questions are
normally off-topic, but are OK if they are related to a CCS compiler
project, using a Microchip PIC microcontroller. ARM is off topic.

nailuy · Joined: 21 Sep 2010 Posts: 159

mabe is to late now, but mabe it help somewone.
you cannot make and electric engine (asincroic engine) to work in simple square wave at 50Hz. You must generate alternating sinusoid, by PWM of one microcontroller... to be apropiate to ideal sinusoid to alternate magnetic flux to create rotating copule to turn the rotor. If you heave simple square wave you will have simple magnetic change, without or less changing magnetic flux, In fast way without power to push the rotor.
This is simple to understand difference of square wave (simple digital) or sinusoid wave (PWM).

gaugeguy · Joined: 05 Apr 2011 Posts: 288

You must have missed in all of these very old postings that the OP was using an ESC (Electronic Speed Control) and not direct driving a motor.

Ttelmah · Joined: 11 Mar 2010 Posts: 19215

Problem is of course that if this ESC takes a RC servo type signal he want's
a much finer resolution than a PWM will normally give. On the PIC better
to use a CCP to do this. Otherwise the resolution will be awful.