I followed a YouTube Electronics Video and Regret it! (Debunking a 500k video)
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Date: 2022-09-04
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Comments and reviews: 14
Rubab
After watching the diagram, I initially thought it works like a crude RING oscillator created by 3 mosfet and 3 coils with a star point. This is awful. Cause not all inductor or mosfets are ideally same and won t start the motor due to insufficient current draw from star point to Lets say coil 1. It totally depends on high frequency oscillation, so you really don't have much room adjusting the frequency value. Some might add capacitor to control over frequency making the circuit worse and unstable. Also the total load is not equally distributed as you showed in last, it works with star point less motors too - prooving that only two transistor oscillating as multivibrator but in this case creating alternating current due to the nature of inductor to store and pull over the current. last but not least, the freaking spikes will definitely kill a Mosfet in the long run no matter how good they are.
Designer of this circuit must be on weed while designing such bs.
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After watching the diagram, I initially thought it works like a crude RING oscillator created by 3 mosfet and 3 coils with a star point. This is awful. Cause not all inductor or mosfets are ideally same and won t start the motor due to insufficient current draw from star point to Lets say coil 1. It totally depends on high frequency oscillation, so you really don't have much room adjusting the frequency value. Some might add capacitor to control over frequency making the circuit worse and unstable. Also the total load is not equally distributed as you showed in last, it works with star point less motors too - prooving that only two transistor oscillating as multivibrator but in this case creating alternating current due to the nature of inductor to store and pull over the current. last but not least, the freaking spikes will definitely kill a Mosfet in the long run no matter how good they are.
Designer of this circuit must be on weed while designing such bs.
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Luk
Hey,
I really enjoy your content.
Do you still take video requests? I'm trying to design a circuit that heats a resistive wire (4 Ohm. Basically I have an Arduino, that I want to use to drive a P-MOSFET that connects the wire to 24V source. Between the Arduino and MOSFET I'm trying to design a totem pole (push-pull) driver but I'm still unsuccessful. I'm trying to control the voltage for the wire, basically trying to do buck converter.
I'm trying to learn everywhere I can but I'm currently stuck with this problem. I don't fully understand the calculation, like how much current is going to the gate of the MOSFET when it's charging and if its charging properly. I saw your videos, but you're using an gate driver IC.
If you would feel like doing something like this with a little calculation I would be greateful.
Thanks and keep up the great work!
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Hey,
I really enjoy your content.
Do you still take video requests? I'm trying to design a circuit that heats a resistive wire (4 Ohm. Basically I have an Arduino, that I want to use to drive a P-MOSFET that connects the wire to 24V source. Between the Arduino and MOSFET I'm trying to design a totem pole (push-pull) driver but I'm still unsuccessful. I'm trying to control the voltage for the wire, basically trying to do buck converter.
I'm trying to learn everywhere I can but I'm currently stuck with this problem. I don't fully understand the calculation, like how much current is going to the gate of the MOSFET when it's charging and if its charging properly. I saw your videos, but you're using an gate driver IC.
If you would feel like doing something like this with a little calculation I would be greateful.
Thanks and keep up the great work!
reply
anuradha
Even though it's not a reliable way to drive a BLDC, I find it's still impressive that it somehow able to spin the motor. I wonder if there is a possibility to overcome the issues you highlighted with this design with few more analog components ( op amps, transistots etc. BLDCs are quite cheap these days yet escs are bloody expensive than the motor. If there is a way to build a simple esc for a lower price, I think this type of controllers too can have some niche applications.
Also I don't agree with the title debunking. It's certainly a working design, only it's not really good for anything at this stage.
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Even though it's not a reliable way to drive a BLDC, I find it's still impressive that it somehow able to spin the motor. I wonder if there is a possibility to overcome the issues you highlighted with this design with few more analog components ( op amps, transistots etc. BLDCs are quite cheap these days yet escs are bloody expensive than the motor. If there is a way to build a simple esc for a lower price, I think this type of controllers too can have some niche applications.
Also I don't agree with the title debunking. It's certainly a working design, only it's not really good for anything at this stage.
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hyoenmadan
I see tons of smarties arguing with what's the point if chinese controllers are sooo cheap! (tm. Let me say this. This dependency on microcontrollers, specially the cheap ones made in certain place. For even powering DC motors will get us f ck d sooner or later. Do you think the actual semiconductor scarcity is terrible? Just let the real wargames to start. Then you smarty will understand why older people says war is a good method to make people creative again. .
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I see tons of smarties arguing with what's the point if chinese controllers are sooo cheap! (tm. Let me say this. This dependency on microcontrollers, specially the cheap ones made in certain place. For even powering DC motors will get us f ck d sooner or later. Do you think the actual semiconductor scarcity is terrible? Just let the real wargames to start. Then you smarty will understand why older people says war is a good method to make people creative again. .
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Coastal
Haha welcome to my shoes!
As someone who is relatively inexperienced with electronics I used to spend a lot of hours watching and trying to recreate projects which always half-worked.
Even with trustable sources a 100% recreation is just not possible because even you will agree, a lot of the times you have to work through loop holes due to unavoidable reasons (component not available etc)
Every outing is a learning experience nonetheless
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Haha welcome to my shoes!
As someone who is relatively inexperienced with electronics I used to spend a lot of hours watching and trying to recreate projects which always half-worked.
Even with trustable sources a 100% recreation is just not possible because even you will agree, a lot of the times you have to work through loop holes due to unavoidable reasons (component not available etc)
Every outing is a learning experience nonetheless
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grodiosp
Hello guys, iam a 19 years old hobbiest, i tried getting into electronics more than once but failed. I have mulitmeter and some lithuim ion batteries a lot n lots of electric components. I feel like i cant make any circut board and No matter how much i tried understanding each basic component i fail. I bought breadboard but still not able to make any basic circut board.
Any tips? Iam really passionate about it please inform me
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Hello guys, iam a 19 years old hobbiest, i tried getting into electronics more than once but failed. I have mulitmeter and some lithuim ion batteries a lot n lots of electric components. I feel like i cant make any circut board and No matter how much i tried understanding each basic component i fail. I bought breadboard but still not able to make any basic circut board.
Any tips? Iam really passionate about it please inform me
reply
Treeline
While it's not in any way an Electronic Speed Control as it doesn't offer any speed control, it's an interesting bench toy BLDC driver topology. Wouldn't call it a hoax or fake, it's just not that useful. With some tweaking though I wouldn't be surprised if this topology showed up in some cheapified China export motorized toy.
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While it's not in any way an Electronic Speed Control as it doesn't offer any speed control, it's an interesting bench toy BLDC driver topology. Wouldn't call it a hoax or fake, it's just not that useful. With some tweaking though I wouldn't be surprised if this topology showed up in some cheapified China export motorized toy.
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USSR
Can you drive a bldc motor with pc
I mean is there any way to control speed of bldc motor and drive them using your motherboard somehow
I asked because motherboard can generate pwm signals for pwm controllable fans in pc to control speed rgb etc, signal comes through motherboard 4 pin or 3 pin header
So can you?
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Can you drive a bldc motor with pc
I mean is there any way to control speed of bldc motor and drive them using your motherboard somehow
I asked because motherboard can generate pwm signals for pwm controllable fans in pc to control speed rgb etc, signal comes through motherboard 4 pin or 3 pin header
So can you?
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d m
These are synchronous motors, they can spin only on the current's frequency. So when you want to start the motor, you have to increase the frequency from zero to the desired, otherwise they won't start. So if the circuit not supports the soft start, it's not wierd if you have to spin up the rotor by hand.
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These are synchronous motors, they can spin only on the current's frequency. So when you want to start the motor, you have to increase the frequency from zero to the desired, otherwise they won't start. So if the circuit not supports the soft start, it's not wierd if you have to spin up the rotor by hand.
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309Electronics
I got a cheap 30a esc from ali for 6 euro, dirt cheap! Why make this useless circuit? Just save the mosfets for your next big project i also disliked all those esc vids you can make a esc at home but with 2 mosfets for each motor connection and a cheap atmega 328 pu mcu
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I got a cheap 30a esc from ali for 6 euro, dirt cheap! Why make this useless circuit? Just save the mosfets for your next big project i also disliked all those esc vids you can make a esc at home but with 2 mosfets for each motor connection and a cheap atmega 328 pu mcu
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EightOneGulf
Please don't hold a motor with a prop mounted to it in your hand and power it. The motor you used may seem like a toy to some, but it's perfectly capable of doing some damage. think shredded plane episode from MythBusters but with your fingers instead of a plane.
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Please don't hold a motor with a prop mounted to it in your hand and power it. The motor you used may seem like a toy to some, but it's perfectly capable of doing some damage. think shredded plane episode from MythBusters but with your fingers instead of a plane.
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Rocky
I wonder what would happen if capacitors were to be used in with the circuit. (delta configuration to star configured windings) I mean ZVS is a simple circuit but it work fine.
so rather than finding downfalls we should try to find ways to improve it somehow.
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I wonder what would happen if capacitors were to be used in with the circuit. (delta configuration to star configured windings) I mean ZVS is a simple circuit but it work fine.
so rather than finding downfalls we should try to find ways to improve it somehow.
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Ramog1000
I kinda still like that circuit, it shows that there are simple principles at work theoretically but you need a more complex system to work out the issues. Wouldn't use it ofc but its good to know that this theoretically is all thats needed to get it to spin.
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I kinda still like that circuit, it shows that there are simple principles at work theoretically but you need a more complex system to work out the issues. Wouldn't use it ofc but its good to know that this theoretically is all thats needed to get it to spin.
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Tim
I don't know why they're still called that (Brushless DC motor. The ones in stuff like a PC fan, it's the motor and control stuff in one area. But just having like an RC motor, it's not a DC motor. It's a 3 phase permanent magnet motor.
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I don't know why they're still called that (Brushless DC motor. The ones in stuff like a PC fan, it's the motor and control stuff in one area. But just having like an RC motor, it's not a DC motor. It's a 3 phase permanent magnet motor.
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