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Motor Control / Re: BLDC sine wave using a L298n
« Last post by orion_pt on January 05, 2018, 12:02:24 PM »
I'm doing exactly the same and having the same problem as you. I also increased number of steps and it improved. The 10 bit resolution makes it worse but reducing the pwm speed makes it better but you get the frequency noise. I think the 298 is having problems with pwm signal creating noise in the output. Could it be necessary to have DAC between arduino and the 298 or a different driver would be a better choice?
Motor Control / BLDC sine wave using a L298n
« Last post by navanod on January 03, 2018, 04:05:26 PM »
Hi all and greetings.

I have been working on a BLDC project for a while trying to use the sine wave tables to generate like it was shown in the stroboscope project.  I do get movement but it is certainly not as smooth as I would like,  I have tried more steps and this helped a little but still not great.

I am wondering id this is really not the fault of the l298n?

Ive got one dev kit from TI here for a fancy fan controller and at 7 hz the same motor is silky smooth.

love to hear your thoughts on the old L298n for slow speed bldc control.

Electronics Repairs / Re: List of Seagate firmware terminal commands
« Last post by SALIM on December 16, 2017, 10:30:04 AM »
Hi to all

i need help for LEVEL 2 and LEVEL 7

Level 2 'I': Rev 0011.0001, Overlay, DisplayModifyAdaptiveParm, I,[GroupId]

Level 7 'I': Rev 0011.0001, Overlay, DisplayModifyAdaptiveParm, I,[GroupId]

Please few words,  how to use this CAPITAL I


Electronic Parts / want to connect my Arduino UNO
« Last post by mishmalik on July 11, 2017, 05:07:13 AM »
Hello !

I want to connect my Arduino UNO to a One Relay Switch Board.
I also want to connect relay to a Fan, TubeLight etc

Relay connections :  POLE, NO, NC,

Please can any one explain me the connections Please.
Electronic Parts / want to buy arduino
« Last post by mishmalik on July 11, 2017, 04:41:56 AM »
Please help me in buying an Arduino starter kit. I am new to Arduino, and I am looking for Arduino starter kit. I found this starter kit via google
General Discussion / Brushless Motor Theory
« Last post by Phebex on May 24, 2016, 05:20:58 AM »
i think it's fine om posting here.

i found interesting site
Check this site this site talk about Electrik Motor.
Even You can calculated here Winding Calculator.

From that site i found my brushless(14 magnet pole and 12 cogs) has Direction AabBCcaABbcC and AbCaBc

12P9C Brushless | Direction : A-B-C-A-B-C

14P12C Brushless | Direction : AabBCcaABbcC or A-b-C-a-B-c-

from here i'm confuse how to make diagram like you do. if I had to make a table size 12x6 (due in accordance with the number of his COG) or a 7x6. I do not know how to determine the level. I also attach a file containing the tables.

one more ask, in that site you can found winding animation.

fig. 01

when you click it there is any step for windings

fig. 02
Please tell me, that is step if i'll make a winding isn't?! not steps like you do in Driving a three-phase brushless DC motor with Arduino – Part 1. Theory

*My Attachment : Google Drive
Member Introductions / Re: Try to study here ;)
« Last post by Phebex on May 23, 2016, 01:49:03 AM »
That fine if you are busy now.

My Brushless is
MARSPOWER 220880T Brushless Gimbal Motor, you can google it, but hard to find datasheet.
there is 14 pole and 12 cogs.
Yes, after I tried to understand the theory of brushless (trigonometry). I also suspect that. there may be a step is missed.

Sorry if it makes you misunderstood. im not using h-bridge at a trial, This trial temporarily halted, because I'm ordering the item.
Member Introductions / Re: Try to study here ;)
« Last post by ElectroNick on May 22, 2016, 02:59:53 PM »
Hello Phebex,

Thanks for stopping by my blog/site.

I have to admit, it's been 5 years since I've done the original post you are referring to, and some of the finer details of the software would not be immediately apparent to me now. At least until a careful review, for which I have to admit I don't have a lot of time now. But I will try to at least validate some of your own concerns.

You are absolutely right - the phases of a 14-pole/?? cogs motor will be different than 12-pole/9cogs . You would need to modify the software to have more (I assume more - depends on the # of cogs) PWM steps. Otherwise the rotor will be skipping some of the positions which can lead to uncertain movements - sometimes the next    step in the software would result in the back step rotation of the physical rotor. Which is, I think is what you are experiencing.

I am not so sure how you can make it work at all without using an H-bridge. Arduino's  40mA outputs are not strong enough to drive anything in the physical world (maybe except for the tiniest of the stepper motors). Certainly not any gymbal BLDC I've ever seen. Perhaps you meant "no integrated H-bridge circuit", which would mean that you are using an H-brdge on discrete transistors? I don't know what you mean but if you did not, you should really look into employing one kind of an H-bridge circuit or another. Otherwise you will either fry your Arduino or it simply won't work.

Good luck!
Member Introductions / Try to study here ;)
« Last post by Phebex on May 20, 2016, 02:13:19 PM »
Hello, I'm a newbie here. I came here for 2 weeks ago.
First I want try to make Gimbal for steady cam. But I have nothing. I see many people have same interests with this.
So I'm hunt what I need to build one. Some people managed to make it by using arduino.
So, first think must I have is :
Arduino uno
Mpu6050 (gy521)
Brushless Gimbal motor

I have no knowledge at all about this. Find out anything about arduino code to make brushless rotate, googling about it.
Find your post ( this awesome.

Try your code, but my brushless only shake. Do not know what was wrong at first. Keep reading your articles about Brushless. It makes me more and more insight. I known about pwm, sinusoidal, and etcetera. The Most important is know how brushless work.
For now I assume why my brushless didn't work with your code it's because my brushless using 14 pole magnet. Try with pwmsine for 8 bit make spinning/rotate then stop later. And I not using H bridge.

That's introduced by me.
Motor Control / Re: Updated schematics for a BLDC motor controller
« Last post by ElectroNick on March 31, 2016, 09:39:05 PM »
Jannat, see if you can increase the stepDelay value so the phases are changing slower, and perhaps the pattern may be more clear . One other think I would suggest - comment out the serial communication code around line 71 in the code and re-compile and upload into Arduino again. That serial comm is too slow for the winding phase change and does mess up the normal motor operation. It was there for debugging, I don't know why I didn't take it out of the final code. It's been a couple of years since, I don't remember finer details of the project all that clear now.
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