Induction motors + strobe light RPM measurement

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Explaining how an induction AC motor works (synchronous / asynchronous). Measuring the speed of some asynchronous motors using a strobe light method. Connecting and LED to a function generator and a frequency meter to create an accurate RPM meter.
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25 янв 2024

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Комментарии : 104

@iamdarkyoshi 5 месяцев назад

I love your ability to explain stuff with simple drawings on paper. They're so much easier to understand

@saalkz.a.9715 5 месяцев назад

Shush... That's not a paper drawing it's "AI generated CGI".

@nudebaboon4874 5 месяцев назад

The knowledge this man has is incredible!👌👍

@dimitarnikolov3527 5 месяцев назад

It's worth mentioning that, as soon as the single phase motor starts spinning it doesn't need the phase shifting elements any more and could potentially work without them. The motor could even start by itself, due to vibrations and imperfections, but it would start at a random direction each time. That's how microwaves spin their table at a different direction (almost) every time.

@acoustic61 5 месяцев назад

I always wondered about the microwave carousel.

@Basement-Science 5 месяцев назад

It's also possible to use a gearbox that prevents running in the other direction mechanically while stopping the rotor in a position where it can build up enough inertia the other way from a stand still. I think these turntable motors instead have some slack before they drive the output (and thus the heavy plate) in a different direction, which means they run with no load at first and thus have enough torque to start in a single AC half-cycle.

@rsaj-cq6ne 4 месяца назад

I do not agree. In a single fase asynchronous motor even already running the magnetic field has to rotated and be ahead the rotor spin to do a positive work. Due to secondary effects it could still produce some torque but would not be able to hold the nominal torque required. To proof my point try a capacitive run motor under load and try to remove his capacitor while running. The motor will stop.

@dimitarnikolov3527 4 месяца назад

@@rsaj-cq6ne Yes, if a motor is designed to work with a capacitor and you remove it, that would change the characteristics of the motor. I did not meant to imply that every single motor can operate normally in this mode. I just wanted to say that a motor could keep spinning without the capacitor (at least when unloaded) and some motors are even designed to run that way.

@lukasmauer230 4 месяца назад

Well, actualy, the table spining motor is synchronous. I disassembled one and it has tiny magnet (and it can be the reason of random direction.

@UpLateGeek 5 месяцев назад

You should expect a visit from the police soon, because that line "artificial intelligence 3D computer simulation" absolutely killed me! I laughed for about a minute straight, to the point where my face and chest were hurting from laughing so hard I was unable to breathe! I'm still chuckling just thinking about it.

@yoeribolderdijk1257 5 месяцев назад

I love your advanced AI explanation 👍

@piconano 5 месяцев назад

Knowledge is true power. That makes you a powerful man. Thank you for sharing your power with others.

@edgeeffect 5 месяцев назад

That's excellent! At the start, I saw your washing machine motor and was sad because in the UK all (?) of our washing machines have universal motors and I'll "never" find an induction motor to play with. But then your second demonstration made me look closer at my microwave fan motors and they ARE induction motors. So thank you for making me look closer at my own junk. Same as always, your AI 3D computer simulations are excellent!

@DiodeGoneWild 5 месяцев назад

This motor is from a bread maker. Washing machines switched from induction motors to universal motors probably in the 1990s to give them a high speed (and adjustable speed) spinning ability. Before this, they used to have a 2-speed induction motor with 2 sets of windinds. The motor I saw from the 1980s - 1990s washing machine had one set for washing (16 poles, about 340 RPM), one set for spinning (2 poles, about 2900 RPM). Each set was made of 2 windings, one connected via a capacitor, one directly. So in total 4 windings.

@edgeeffect 5 месяцев назад

@@DiodeGoneWild I want to see that 16/2 winding motor now. :)

@Satyaprakash81102 5 месяцев назад

I am from India and here we can buy washing machines with an induction motor. Washing machines available here in India are of 2 types top loading and front loading. Top loading types can be sub categorised as automatic and semi- automatic type. The semi automatic type has two induction motors. One is for wash agitator. It's a 6 pole or 8 pole PSC type induction motor and speed is reduced by pully and gear reduction mechanism to ~200- 300 rpm for agitator. The spin motor is 4 pole PSC type motor spinning the spin drum at ~1100 -1400 rpm depending on the load. It's surprising that Europe markets don't have semi automatic washing machines!!!!!!!!!!!!!!!!!!!!

@nayakacreativity3639 5 месяцев назад

Here in indonesia a lot of washing machine top loading that use induction motor, at the scrap yard also we can find a lot of scrap washing machine induction motor

@marcse7en 5 месяцев назад

LG Direct Drive Washing Machines don't use Universal Motors, and there are machines that employ induction motors (Indesit?).

@user-tz3fd8hm4q 5 месяцев назад

A good and pretty precise way to measure the RPM of motors. I've also measured the RPM of some of my DC motors with this technique. Thanks for your work!

@HomelabExtreme 5 месяцев назад

Great opportunity to build a DIY 3-phase motor driver for synchronous and asynchronous motors :D I have been wanting to do this for years.

@techtinkerin 4 месяца назад

When I was a kid I had a big two turntable dj box thing. I wanted to change the speed of the records playing so I took it apart hoping to add a variable resistor to the motors. I found that it had AC motors inside it and that it didn't seem possible to achieve what I wanted. Your vid helps me understand how they worked. Thanks! 🙂👍

@bluerizlagirl 5 месяцев назад

Shaded pole motors used to be found in cheap record players -- often with a secondary winding on a separate bobbin section, using the laminated steel core of the motor as the core of a transformer to supply power to an amplifier. The motor runs all the time to power the amplifier, and the turntable is started and stopped by moving a rubber wheel into or out of contact between a stepped cone on the motor (which gives the different speeds by moving the wheel up and down) and the inside of the turntable rim.

@RODALCO2007 5 месяцев назад

Great explanation of the workings of these motors. Your drawings are of exceptional quality. Keep up the good work.

@Kris_M 5 месяцев назад

Some seriously impressive 3D simulations!

@saalkz.a.9715 5 месяцев назад

Your "AI generated CGI" explanation style reminds me of that "old" tv serial made by Tim Hunkin (&Co.) "The Secret Life Of....". 🖖

@felixcat4346 5 месяцев назад

Wow what a great explanation and your graphics were awesome.

@jp040759 5 месяцев назад

WOW Great demonstration tool. Good Job

@MANDINGOBlackPanther-lo1gm 5 месяцев назад

💙Abi Ben tam 3 yıl boyunca elektrikli motor fabrikasında çalıştım fakat bana hiçbir şey öğretmediler hiçbir şey bana aktarımlar sadece bir işçi gözüyle baktılar Ama sen böyle bir şeye bize öğrettiğin için sana Teşekkür ederim Türkiye🇹🇷'den sana selamlarımı gönderiyorum.

@essas.coisas 5 месяцев назад

3D AI LOL that was huge

@amkp40technology 5 месяцев назад

*Thank you for this video ❤❤❤*

@essas.coisas 5 месяцев назад

you rock ! learning so much

@Alexelectricalengineering 5 месяцев назад

Nicely explained!! 👍

@johndevires5911 5 месяцев назад

Excellent, keep it coming.😉👍

@ishakmohammed9827 Месяц назад

excellent explanation. thank you.

@tazgoth23 5 месяцев назад

Induction motor has low startup torque but when it speed up in some time torque increases significantly, so we can say that it is very slowed down by the load if it does not exit the operating mode.

@somewaresim 5 месяцев назад

Very interesting video. Thanks!

@A-Migos 5 месяцев назад

Man he knows a lot. 💯

@Edmorbus 5 месяцев назад

Excellent Thanks for sharing

@wolfrobben6914 5 месяцев назад

I love your AI supported computer simulated explanatory drawings. 😇

@DiodeGoneWild 5 месяцев назад

Thank you for your support and appreciation ;)

@mojoblues66 4 месяца назад

5:05 the phenomenon is called **aliasing**, and the theory behind it is the **Nyquist-Shannon Sampling Theorem**: en.wikipedia.org/wiki/Nyquist-Shannon_sampling_theorem

@MiamiMillionaire 5 месяцев назад

Very interesting 💡👍

@VC-oz5fi 5 месяцев назад

Next : how electromechanical kWh meter works PS: Your AI 3D simulation is excellent. Please keep it

@shakeit995 5 месяцев назад

EEVblog has a video (#1446) on analogue energy meters if you want to find out more about them

@sebastian19745 5 месяцев назад

I remember building a strobe light to precisely adjust the rotation speed of my turntable (it was a Ziphona). Later, I modified it to check the speed of my reel to reel tape recorder (I had an Maiak and after it, an Kashtan at the time).

@tajtrlik1111 5 месяцев назад

Opäť ti chcem poďakovať za vynikajúce video, stroboskopický efekt poznám, len mi unikali nejaké detaily okolo toho, s tvojím vysvetlením je to jasnejšie a v teórii motorov mám obrovské medzery, takže vysvetlenie princípu činnosti asynchrónneho motora som taktiež uvítal.

@ahmedm9788 5 месяцев назад

Hello, very nice video. IT'S A NICE ENGINE. Alright. Explain, I wish you a good day.

@janpolanton5574 5 месяцев назад

Bravo Picasso!

@andymouse 5 месяцев назад

I was blown away by your 3D work, to me it looked like the centre of your diagram was actualy rotating. Blender ?......cheers.

@DrHouse-zs9eb 5 месяцев назад

It's a shame more and more professional Tools use cheap universal motors instead of this type like back then. I wanted a new mitre saw - but All of them are very loud. The old one of my dad is super silent and long live.

@DrHouse-zs9eb 5 месяцев назад

Even a lot of New bench drills dont use this type of Motor anymore

@RunLineMusic 5 месяцев назад

You are right. Like the Bosch pdb 40 - no induction motor.

@MegaSunRise3 5 месяцев назад

The new gen of brushless tools have induction motors

@Basement-Science 5 месяцев назад

One big reason in favor of universal motors is that they can cheaply be speed-controlled with triac circuits, unlike induction motors which would need gearboxes (oldschool) or a Full Bridge motor controller which is still relatively expensive since it needs big IGBTs, rectifiers and control ICs. Even for single speed, an induction motor realistically needs a big capacitor OR additional starter windings and rotation switch.

@DrHouse-zs9eb 4 месяца назад

@@MegaSunRise3no, only the battery powered. Show me a mitre saw without brushes. There are only old models.

@heno_3098 4 месяца назад

Pri pozeraní tohoto videa som si spomenul na podobnú konštrukciu motora ako je na začiatku videa, ktorý sa dá použiť na výrobu tretej fázy. Keďže striedavý prívod má oba vývody otočené voči sebe o 180° je možné vhodnou odbočkou vytvoriť tretiu fázu 90° posunutú voči jednému aj druhému vývodu. Príklad, kde sa to stále používa sú lokomotívy na 25kV 50Hz, kde sa výroba tretej fázy na pohon 3 fázových striedavých pomocných pohonov ako sú čerpadlá trafo oleja na chladenie trakčného transformátora, pohon kompresorov, prípadne na chladenie usmerňovačov a trakčných motorov. Videl som to vo videu o sovietskej lokomotíve VL60 (N60), kde sa používali ešte riadené usmerňovače (ignitróny) zase principiálne podobné ortuťovým výbojkám a od roku 1964 boli postupne nahradzované neriadenými usmerňovačmi na báze kremíkových diód. Viď čas 53:12 až 55:33, ale celkovo vo videu je kopa informácii, ktoré môžu byť zaujímavé nielen pre mňa ako dávno zabudnuté a znova objavené: "ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xDJWw2DG8CM.html".

@luislopez-pf5fi 5 месяцев назад

epic!

@Pascal666... 5 месяцев назад

Can you make a more detailed Video about the motor in minute 7 . For me it always looks like one block of metal 😅

@wbrenne 5 месяцев назад

Yes, support this request. These motors are like black magic to me.

@wbrenne 5 месяцев назад

Yes, support this request. These motors are like black magic to me.

@piconano 5 месяцев назад

If it wasn't for super genius Tesla, I'd be people watching from my porch, rather than watching RU-vid videos and learning many things new every single day. "The present is yours, the future is mine". -abbreviated by me because hard work is implied. ~Nikola Tesla So true and well put.

@videolabguy 5 месяцев назад

Tesla was 1% pure genius and 99% lunatic. Worship not false idols. Especially other human beings. This will lead you to waste a lot of time chasing dead ends. Just some advice from an old man who has done just that. (Me.) Tesla married a pigeon. Look it up.

@fouazhdib6813 4 месяца назад

👏👏👏

@VoidElectronics 5 месяцев назад

Nice! Especially the AI 3D computer simulation.🤣🤣🤣

@worroSfOretsevraH 5 месяцев назад

buenos noches!

@hugoegon8148 5 месяцев назад

Cool idea to measure RPM! 👍 But I didn't get how the rotor can be slower than the rotating field in the stator coils. If mains is 25Hz, how could the rotor rotate at 24Hz. Wouldn't they loose the "connection"? 🤔

@HomelabExtreme 5 месяцев назад

This would happen on a synchronous motor, as it uses permanent magnets, so it has to be 100% in phase all the time. However, an asynchronous motor allows slipping, it works like eddy currents, if you ever tried to drag a magnet across a piece og copper or aluminum, you know how it resists being dragged. And that is basically how the field of the stator affects the rotor.

@hugoegon8148 5 месяцев назад

@@HomelabExtreme Ah, I see. So this 1Hz slip is a small rotation of the magnetic field (backwards) within the rotor itself?

@shakeit995 5 месяцев назад

@@hugoegon8148 yes, the magnetic field produced by the squirrel cage rotor is keeping up with the stator field, but the rotor is not synchronised to the magnetic field. The rotor field is induced by the cage "rods" moving through an alternating field. If the rotor was synchronised to the stator field, no current would be induced and no force or torque would be exerted on the rotor.

@Clancydaenlightened 5 месяцев назад

how you checked your engine timing before odb and can bus

@nikiamz6501 5 месяцев назад

Can you make thermometer with wireless probe which measures the outside and inside elements and shows them

@DiodeGoneWild 5 месяцев назад

I've built this and put it on my website a long time ago: danyk.cz/avr_btep_en.html

@CMarxChako 5 месяцев назад

3:12 Now that was some unexpected 'advancements'. "...And now let's do some artificial intelligence 3D computer simulation of what's happening in it..." The words have nothing to do with each other in this set up but somehow it works. 🤣🤣🤣🤣🤣 I AM DEAD!! DEAD I SAY..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣

@LawpickingLocksmith 5 месяцев назад

OMG you for got your beautiful cat. Btw: Japan is divided between 60Hz in the south and 50Hz in the north. Let us know which frequency you think is more efficient.

@DiodeGoneWild 5 месяцев назад

Lower frequencies are better for big machinery (big generators, big industrial motors, long power lines). Higher frequencies are better for smaller appliances. The first mains frequencies used were around 25Hz only, it worked better for all the big things. But lights flickered and lower power transformers were bigger and less efficient. They also tried 133Hz, which made transformers much smaller, but it was too fast for motors. So they went to 50 or 60Hz as a compromise.

@publicmail2 4 месяца назад

How many Poles does it take to turn this motor?

@ronishbarakoti4371 5 месяцев назад

Hello, I have 808nm 200mw IR laser diode but I don't know how to make driver board circuit for this laser diode.can you give me suggestions or tutorial for this laser diode and it can burn matchstick from 1 meter distance with in second.

@xDR1TeK 5 месяцев назад

So when the slip happens regularly, does it trip back when the phases overlap again? What happens when the shaft is stallled?

@Basement-Science 5 месяцев назад

in an async. motor the rotor doesnt have a polarity by itself, it only gets one from induction. So the slip angle will stay the same unless the load changes. If you mean in a Synchronous motor though, it WILL basically get "overtaken" by the stator field and lose all its torque if it is loaded too heavily. It always needs some way to synchronize for startup, and if it ever stalls, it needs to be resynchronized. Depending on the motor, stalling or improper startup can also cause permanent damage though.

@xDR1TeK 5 месяцев назад

@@Basement-Science thanks man. ❤️

@andiback 5 месяцев назад

Great video! But I do not understand how is the small induction motor able to initial start even from every angle with two magnetic poles only? Imagine the two pedals of a bicycle: There's this exact angle position of pedals, one showing to ground, the other to sky, at that exact point I do not have any force momentum with my feet/legs to get my bicyle to move!

@DiodeGoneWild 5 месяцев назад

In the shaded pole motor, the short turns create another 2 poles with the ac magnetic field delayed (lagging). That's why the magnetic field is rotating, not just pulsing.

@andiback 4 месяца назад

@@DiodeGoneWild Thank you, wow didn't even know that such a simple single phase AC motor running without a capacitor does exist, from an environmental waste aspect of view this motor uses hardly any rare earth elements which is very good in my opinion!

@TheEmbeddedHobbyist 5 месяцев назад

which is why you should not have fluorescent lights in a room with rotating machinery. they can look to be stationary when they are still rotating and just waiting to rip your hand off. Nowadays I expect that you need to be just as careful with LED lamps as they can be flashing just as bad as fluorescent ones.

@DiodeGoneWild 5 месяцев назад

This is partially a myth, because no source of light designed for illumination actually produces something like 1% duty cycle flicker, which would produce a sharp stationary image. In reality, it's at least 50% duty cycle in the worst LEDs with no smoothing. Fluorescent and discharge lamps only barely touch zero light output during current zero crossing. Of course rotating machines can appear stationary or moving much slower in such light, but the image is very blurry, which can hardly make you believe the machine is off.

@TheEmbeddedHobbyist 5 месяцев назад

It maybe a myth, but I'm sure in the UK any lamp that can flash should not be used near rotating machinery. I'll have to check what the Health and safety requirements. I remember being shown a lath that looked stationary due to a overhead light at the health and safety executives (HSE) black museum in London during the late 70's. Quote from the HSE "Lighting at work" Stroboscopic effects "28 Lamps that operate from an alternating electrical supply may produce oscillations in light output. When the magnitude of these oscillations is great, machinery will appear to be stationary or moving in a different manner. This is called the stroboscopic effect. It is not common with modern lighting systems, but where it does occur it can be dangerous; so appropriate action should be taken to avoid it. "

@andymouse 5 месяцев назад

Squeak !!@@TheEmbeddedHobbyist

@TheEmbeddedHobbyist 5 месяцев назад

Eek, Hi Mr Squeak@@andymouse

@PatrikFormanek1 5 месяцев назад

Nice. Super video a super obsah :-) Diky

@laughingoreilly1334 4 месяца назад

I've found a centrifugal switch in some motors

@widyahong 5 месяцев назад

How 1 phase motor can have 3 speed?

@user-wv8uk5fd9t 5 месяцев назад

Brother I have a dought on a RU-vid video can you debunk it

@tiagoferreira086 5 месяцев назад

Shaded pole motors are kinda black magic... I do understand how they work nowadays, but they got me thinking many years

@anonhollmuller4032 4 месяца назад

You need to take a different gear Ratio. The generator Must be Turned faster You have to mention rhe magnetic Slip twice ;). And i would use a capacitor for each "generator" windig ;). good luck!