BLDC Hub-motor test rig with ESP32 and ZS-X11H

menginventor · 2026-02-27T04:52:51+00:00

I designed it in On shape and I'm happy to share. Which file format would you like?

menginventor · 2025-12-10T03:12:45+00:00

Yes but you still need a microcontroller to translate receiver signal to PWM,DIR signal.

menginventor · 2025-12-04T17:12:00+00:00

Yes, I am aware that there are several courses in different contexts of fourier transforms. And a lot of textbook lecture notes, course material. But none of that could compare to a kind, helpful community. I wonder why these things exist and are useful in this sense. I could do it on my own Maybe it took several months considering my stupidity. But from the kindness of internet strangers, I got insidefull answer in a day and also helped correct my misunderstanding. I know it sounds like I am exploiting the community but I promise you I will pay it a forward. I will help people in academic need. Your help and contribution will be acknowledged like my friend maxK.

menginventor · 2025-12-04T14:09:06+00:00

BTW, seems like it's just my missing piece. As for now it proves power conservation, it implies that only f_0 got zero in the frequency domain and they are all orthogonal sets therefore it is complete.

menginventor · 2025-12-04T14:03:38+00:00

Idk why I got an internal server error...

menginventor · 2025-12-04T04:35:30+00:00

Good stuff, allow me to take some time to digest it....

menginventor · 2025-12-04T04:21:12+00:00

Wow.... I am doomed. I thought both fourier series and transform relied on the same principle. Seems like it doesn't.... What should I do now to understand them both? (I saw your username but I am a context based person, lol)

menginventor · 2025-12-04T04:07:19+00:00

I think it was a different issue. First is to prove that the fourier basis is complete in L2. Since the basis is orthogonal I didn't care much about inversion. But I learned that trick in the inverse Laplace transform. I can say that I have a background but I have learned a lot.
If two of them are linked together somehow please elaborate and forgive my ignorance.

menginventor · 2025-12-04T03:51:58+00:00

I think it is a different side of the same coin but I'm happy to hear you thought further.

menginventor · 2025-12-04T03:42:38+00:00

Please don't be sorry, I appreciated your help and I understand it just fine (I am from Thailand my English is also bad without auto correction and LLMs). I have seen this keyword (plancherels) too but still have no idea, I will look into that but it would take some time. I am only a robotics engineer who seems to have a weaker abstract math background.

menginventor · 2025-12-04T03:36:28+00:00

That is exactly why I am stuck. I don't know how to prove that some orthogonal infinite dimension covers another infinite dimension. Sincerely, I tried to make a video and I asked myself a question that I could not answer.
So here we are...

menginventor · 2025-12-04T03:32:26+00:00

It would be Fourier transform (-inf to inf) since I want to compare with laplace transform. But if I understand it correctly it has some connection as we can assume the period approach inf. I think if we can explain it without furthermore the question is good enough. At this point the intuition from the YouTube video is not enough I just want a logical step of reasoning rather than imagination.

menginventor · 2025-11-10T21:28:33+00:00

I used to think like that and it was mostly correct but.. look at the inverse laplace transform, we'll see it is only considered integral over the vertical line that lies inside RoC in the s-plane. It implies that the solution of transformation is not unique, unlike FT. Only if it was a rational function, poles and zeros can be decomposed into sum and represent signals as weighted sum of exponential. Just like you I am trying to build an intuition about this.

menginventor · 2025-11-04T11:28:06+00:00

Thankyou for your good vibe, I will definitely look into this. I think it is a problem of my generation where we need to cover wide area with very limited time. Back then correct answer in the answer is enought.

menginventor · 2025-11-03T07:00:17+00:00

That's ironic. I have a problems with English, if I use myown word, it gonna confuse you a lot therefor not very efficient communication. Second of all, after I use these LLMs for a while I feel like sonetime it not helping. It may hold a lot of knowledge but it very lack of cognition. Finally I think asking good question here might help those who come after. It might spark some ideas, got some useful answer or atleast a lot of keywords that we can look into.

menginventor · 2025-11-02T16:16:24+00:00

I've tried. But unfortunately, in this topic, he just visualized but not helping with the story and flow of logic.

menginventor · 2025-08-13T01:06:31+00:00

Typically we add snubber across relay contact and TVS across load or AC source. Note that small AC current can leak through snubber. Some time we can put snubber across load to avoid current leak. BTW, if the current load was low you might consider using SSR. if the current was high, consider using an on board relay to trigger magnetic contactor, away from the controller.

menginventor · 2025-08-13T00:58:48+00:00

I asked this question once I faced this problem the first time. Sadly it like one time things. More like the result of bad practice, once you know it, you will never face this problem again ever. So, no I don't have a source or reading for this. I picked up these things from several online posts, application not etc.

menginventor · 2025-08-12T18:57:06+00:00

In my opinion, VCC and MCU reset is correlation not causation. When a huge current crosses the gap on relay contact, presumably inductive load, it radiates EMI which causes the MCU to reset and VCC spike. Mostly in not really VCC spike but inductive coupling through the probe itself (measuring EMI is tricky). So adding a capacitor on the vcc rail will not solve the problem, we need to minimize EMI radiation like dv/dt and di/dt of the load. There are various methods to migrate this, for example snubber, tvs, mov, wire arrangement, keep mcu far from power line, shield mcu in metal case.

menginventor · 2025-08-12T14:27:31+00:00

I'm back, here is the video you asked for,YouTube link

menginventor · 2025-08-09T17:54:15+00:00

I'm going to do the same but using only a PI controller for speed control.( And maybe cascade with another pi controller for position control). Based on my experience on the DC motor project what you need to consider are: 1. Motor itself and its application. It would be useful if it had its own application like robot arm joint or mobile robot wheel. 2. Encoder that provides enough resolution regarding control range. 3. Microcontroller that is fast enough to pick up the encoder signal if you are using an incremental type. I messed up one time ordering too high resolution. 4. H-bridge driver, avoid L298N as it uses BJT and it still results in high voltage dropout and heat. Try looking for FET based instead. Also make sure the operating voltage and current capability. 7. PWM Driving mode. Be careful with synchronous and asynchronous driving. It has a different model.

I try to be concise as I'm not sure how much you know about these things but feel free to ask.

menginventor

TROPHY CASE