Let's build a 3-pole DC motor that's self-starting (Motors #2)

[@tinyau4842]

I only come across your channel and it is brilliant to see your simple experiment which helps easily understand how two pole and three pole work and the effect to the torque of the motor

[@johnyeap7133]

I am NUS freshman. I like a lot.

[@JimTheZombieHunter]

This is the kind of thing that I dreamed of building half a century ago .. with the Alfred P. Morgan text ("The Boy Electrician" .. yes, my favorite book then) at hand. This is an excellent video .. I have subscribed .. and looking forward to watching the rest - past and future. I don't know if you'll find a following in 2022 willing to step back from the idiot screen long enough to wind 600 turns of 28 AWG.. but hey .. I'm your first "I think I you rock" here comment .. (And I've done that ... winding coils. Solenoid.. RF.). This is proper video. and you and I both know that in the ultimate aftermath .. we will make the power go. We will be kings. Hyperbole perhaps .. or not. just going oe'r the top saying I love this content.

[@michaeljenner]

Great videoseries on dc motors! The best I've seen! Could you maybe elaborate a little on the updated magnet holder which spreads out the magnetic field? If the material is magnetic, doesn't it form a magnetic circuit above the rotor core, and hence just reduce the magnetic field seen by the rotor significantly?

[@adanner]

The uniformity of the stator field (not just its strength) makes a difference. In a more symmetric rotor with many poles this isn't usually a problem because the forces balance well - but here with three rotor poles, one of the three at any given time will be passing rather close to a stator magnet. If the stator field is too concentrated at that point, as it could be without the spreader, the attraction of the rotor core metal to the stator magnet can then be too strong for the motor's torque to overcome.

[@sajza1728]

Thanks very informative! Is it possible to build a dc motor with higher torque than speed?

[@juff89]

I always though the armature core shouldn’t touch the shaft because that would just make the shaft an electromagnet?

[@DeltaSigma16]

Good

[@sajza1728]

Thanks for the video! Please cold you inform me with a proper source that I could learn how to build my own dc motor or could you make a video and teach us step by step on how to build a desired dc motor. For instance, I’m aiming to build a dc motor that could run by 24v and 10A and has a 10Nm torque. To do this, how should I start and what are all the steps that I need to take to achieve that goal? It’d be deeply appreciated if you could either reference me to a proper/right source or if you could make a video or a series of videos reaching us that. Many thanks!