Why not a hall sensor?

That's some very useful information, that made me switch from reed switches to hall effect sensors.

Unfortunately, the balance on the radius was not done. I naively thought that magnets were ideal in weight, but this is not so. In addition, their placement is also far from perfect, it's handmade, without any machines. If I had made an imbalance along the radius, the effect would have been much higher.

Can u place a coil around the disc to have it work without power source?

That’s absolutely normal Any body can do that

Yes, there is no wobble, but there is an imbalance of the disk along the radius. I would achieve more speed and less noise if I did at least a little work on it. The magnets are not ideal in terms of weight and placement, I didn't take this into account and they are on the edge of the disk. Now I understand this after I corrected the imbalance of my grindstone and completely removed its vibration. Video here - kzfaq.info/get/bejne/fJmWicqU29PJqGg.html

Thanks, but my motor is actually making a lot of noise because I didn't balance the rotor. The shapes of the cutouts for the magnets are not ideally made by hand, but the magnets give more imbalance, their weight is also not equal. Too bad I was too late to realize the value of correcting an imbalance after doing it on my grindstone - kzfaq.info/get/bejne/fJmWicqU29PJqGg.html

it sounds more akin to the civic that used to blast by my house at 3AM

bot

That's good advice. Though I'd imagine in this use there is very little arcing or power dissipation at the switch transitions. I also heard they are wetted with mercury or other liquid metal, although that may not be usually the case, especially in modern times.

The reed is only conducting a weak control current to the mosfet gate !

@@paulanthonybridge5741 whats the purpose of 10k resistor

@@romsaymwiti9387 To shut down the Mosfet gate properly after pulses. Without this mosfets can "lock up" in the "on" state sometimes.

@@romsaymwiti9387 для закрытия транзистора

There are even simpler designs for an e-motor. However, no one would use such simple motors since efficiency is very poor.

Do you think DC motor inverter fan really saves power or is a gimmick?

@@dinozaurpickupline4221 Vendors say that power consumption drops to 70%. This might be a bit overrated, but power savings are real. Modern brushless DC motors are more efficient than one-phase AC motors, and this outweighs the small losses of the AC/DC conversion. Also speed regulation is simpler and more effective with DC motors. That's why DC motor driven fans have more steps for the speed. A power comparison should be possible by looking at the technical specifications, but I never delved in this myself, I don't live in a hot country. 🙂

@@heinzpg with clamp meter on AC wire the draw is reported for speed 2 is 36w & for speed 1 the draw is 65w which is quite less than AC Fan 100w,some civil engineers advised me that dc motor isn't as long lasting,lol well I need two,so I'll probably put in

@@heinzpg this is India here

No. The RPM is clocked by the tacho every time it detects the reflection from the white tape on the disc, i.e. once per rev.

Патологоанатом может сгодиться!

Вполне достаточно, но нет предела совершенству. 😄 Обращайтесь, всегда отвечу. Желаю творческих успехов! 👍

In this motor design, all magnets and all coils point in the same direction. In this case, electromagnets can work both at attraction and repulsion. The only advice (I didn't do this) is to balance the disk after attaching the magnets. To do this, you need to easily fix the disk on the axle so that it rotates freely and then pick up the weights on the lighter part. First, select the desired counterweight with plasticine, then weigh the plasticine and replace it with a screw, bolt or other of the same weight. And place it in the hole of the disk in the same place where the plasticine was. I hope I explained clearly (I am writing through a translator). This way you can greatly reduce vibration and increase rotation speed.

0.4-0.5 mm diameter

Геркон, на то и геркон, внутри вакуум и не должно быть искрения.

​@@user-bk1ft2be9ulol

Of course, instead of a reed switch, you can use a Hall sensor. I did it in this video - kzfaq.info/get/bejne/buCEiMpqu7iugXU.htmlsi=A_vW1ZaNYAN2xg0M The video shows a 4-stroke engine. One phase is shown in this diagram - ibb.co/YRHk9BN

@@grain8314 But that video does not contain a circuit diagram. Thank you.

Of course there's a reason. I can't definitively tell you it, but there is one. Lol

No, the stepper motor has a different principle, there is impulse control.

Did you get it working yet Taiye? If not, I would try removing the rotor, then at lower voltage, activate the coils and hold a magnet up to each coil individually to see if they both attract or both repel the magnet. It could be as simple as reversing the wires on one of the coils. Also, the alignment of the magnets on the rotor need to be as close as possible to being equally divided up around the rotor, with each magnet having the same polarity facing outward. The positioning of the reed switch is also fairly critical. I also would like to build one of these but lack only the magnet wire. I really like this channel. He is very talented and makes this look easy. You will get it working if not already. Let me know what you find was wrong. It might help me if I decide to build it. One other thing, if you get it working be extremely careful at these high speeds on a homemade motor. The magnets could fly off and cause an injury.

Постоянный, конечно.

I made the coils myself. Here is the way - kzfaq.info/get/bejne/gdhhnbR80tbGc6M.html

@@grain8314 thanks!