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« on: February 15, 2018, 07:34:23 PM »
Chiragthelegend12
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I was Just Surfing the net and came across Sensored brushless systems.
So what does that mean?
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« Reply #1 on: February 15, 2018, 08:21:38 PM »
Aravind298
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I'd think of two systems.

One is rotary encoder, like a servo.

The other is a hall-effect sensor in a brushless dc motor, that determines the position of the rotor w.r.t the stator, so that the appropriate signals could be triggered.
But instead, the principle of 'back emf' is used in the modern BLDC motors and ESCs.
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« Reply #2 on: February 15, 2018, 08:22:48 PM »
Aravind298
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Watch them all and you'll know.
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« Reply #3 on: February 15, 2018, 08:23:14 PM »
Aravind298
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I guess the second video has what you need to know.
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« Reply #4 on: February 15, 2018, 10:07:30 PM »
Chiragthelegend12
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Thanks!
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E-revo Brushless Edition with mxl 6s.
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« Reply #5 on: February 15, 2018, 11:37:07 PM »
rishabhbarma
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Sensored for on, sensorless for off-road.
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« Reply #6 on: February 16, 2018, 12:11:50 AM »
rcrcnitesh
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There's a lot more to it than on road and off road. It's really beautiful, all that tech if you learn more about it.
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« Reply #7 on: February 16, 2018, 06:32:38 AM »
Aravind298
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Sensored for on, sensorless for off-road.

Could you explain it Rishabh? Not able to figure out.
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« Reply #8 on: February 16, 2018, 09:51:40 AM »
Balakrishna Reddy
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Sensored BL motor : This motor is equipped with hall sensors which will detect the magnetic pole it is subjected to. This will help ESC to perfectly calculate the number of phase rotations as well as to switch the phases of motor.

Sensorless BL motor : Since these do not have sensors do detect the ESCs use separate algorithm to detect zero crossing of the motor. http://ww1.microchip.com/downloads/en/AppNotes/00857B.pdf
More info about zero crossing detection etc in the above link. 
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« Reply #9 on: February 16, 2018, 09:58:00 AM »
Aravind298
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So, is it using a timer or something like that Bala? The AN857 user manual is pretty long to read Grin

Definitely I'll read it, but for right now, do me a favor & clear my doubt. Thanks Smiley
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« Reply #10 on: February 16, 2018, 10:10:51 AM »
Balakrishna Reddy
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This is the good video to get you started.


They use timers to commute but not for zero crossing detection as zero crossing is not controlled by ESC rather it will happen inside the motor only which will be captured by ESC. This is also some times termed as back emf detection.

If someone is interested in building one ESC. You can check out this link.
https://github.com/bluerobotics/BlueESC
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« Reply #11 on: February 16, 2018, 10:30:23 AM »
Aravind298
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That was exactly what I was talking about Grin


But instead, the principle of 'back emf' is used in the modern BLDC motors and ESCs.

Anyways, thanks for the links. Looking forward to make an ESC in the coming weeks.

Hats Off
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« Reply #12 on: February 16, 2018, 01:37:57 PM »
rishabhbarma
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@aravind,

Wrt rc cars, sensored systems are smoother at low speeds.. Hence for on road/crawling, it's preferred over sensorless. It performs better at lower rpm.

At higher speeds/off road- there isn't any difference, except sensored being less efficient. Hence sensorless.
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« Reply #13 on: February 16, 2018, 01:59:37 PM »
Aravind298
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So, the sensors are situated inside the motors? And how are they inefficient? Thanks Smiley
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« Reply #14 on: February 16, 2018, 06:55:52 PM »
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Sensors motors have hall sensor or also called as hall effect sensor which are used to detect position of stator which is then fed to speed controller. In sensor less motor as specified there are no sensor the position of stator if identified by using back emf also known as counter emf generated due to coils of motor as due to load (prop or gear). When there is no load on motor for full throttle motor draw less current as back emf is lessand at specified load it draw specified current at full throttle as back emf is greater.
This all done by ESC. In case is sensors motors hall sensor which is known as brain of ESC detect stator and this ESC works.
It is not point to discuss which is efficeient or better but i think hall sensor me get damage due to long terminado usage. This is what i know. Please correct me if I'm wrong. Thank you . Have a nice day.
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