: Wednesday, October 6, 2021 9:43 PM
To: Carl Nobile
Cc: TriEmbed
Subject: Re: [TriEmbed] Designing a brushless motor controller during the chip
shortage
@Pete:
When you were working on it, did the motor you were using have hall effect
sensors in it? That's about all that makes me willing t
Is there any reason you don't purchase an in-stock BLDC motor driver
such as:
https://www.mouser.com/ProductDetail/Texas-Instruments/DRV10983SQPWPRQ1?qs=%2Fha2pyFadujPwfH%2FXzivpU8AHrIO6U7ALudxKfjNJze3U2dD%2F68jly3tmYweXSYm
Mouser shows 66 in stock, and at $4.61 each.
I'm only showing the o
Charlie,
You can commutate the motor phase from a rotary encoder. No need for Hall
effect sensors. Just phase lock to a zero point and know (measure) the 120
degree phase angles.
I did much open loop motor control at IBM. It wasn't difficult and we did
it with very simple controllers. It does pay
@Pete:
When you were working on it, did the motor you were using have hall effect
sensors in it? That's about all that makes me willing to try this. In the
worse case, I should be able to fall back to trapezoidal control based off
of the hall effect sensors without any sort of fancy estimation.
So my bad, I read Charlie's email and missed the brushless part. I must
have brushes in my mind.
So brushless DC motors are actually 3 phase synchronous AC motors, So three
different PWM modulators are needed for each motor. Each PWM is 120
degrees out of sync with the others. and there can be abs
I once got the idea I could control a brushless motor by being "clever"
controlling set of drivers. I was mistaken. Without some means of
sensing the behavior of the motor, whether it be back EMF or some other
feedback it's about 99% of hopeless. Which is to say I was too stubborn
to give up an
Carl, Charles is looking for a brushless controller, not just a DC motor
driver. Brushless motors are closer to a stepper motor than a regular DC
motor, but the 'steps' are controlled by sensing hall effect sensors to
know when to step to keep the motor running smoothly.
They are great as they hav
Charly,
There are a few solutions to the controller problem. I designed an analog
PWM circuit using op-amps and comparators that works great. You would also
need an H-Bridge you would then need just one MCU board to control the PWM
circuits then then control the H-Bridge circuits.
My design is at:
Hello all!
For the past 5 years or so, I've been working on a open source low cost
sidewalk delivery robot. The current draft (prototype picture:
http://goodbot.ai/lib/exe/fetch.php?media=mk3draft1.jpg) has 4 hoverboard
style motors in a skid steer arrangement. Each robot will need 4 motor
contr
