Available kilometers for traveling: indication of the energy available in the battery and estimation of available Kms for traveling. I want to make a controller because I have some needs, like: I do wish you luck on the controller design-I never got to a working unit with mine, built around the MC3303x chips. There is a specific thread about motor learning resources, too, in the technical section.Īs for Lebowski's controller, you might want to go look at his threads about it. There are quite a few threads around here discussing it, though it will take a while to find them and read thru the various parts of the thread. You'll want to do more reading on how to deal with that, especially. If the controller doesn't know the relative positions of stator windings and rotor magnets, things don't work like they should. Hall (or other ) sensors are often used for a reason, at least on startup of motors under load. This will also answer your question about how to sync when there isn't enough BEMF. I am no expert by any means, and only know the very basics (if even that), but I have a feeling you do not quite know those yet. This is one of the things that blows up controllers when they lose sync, in applications like using sensorless RC motors and controllers on ebikes.Ĭlick to expand.I think you need to learn how BLDC motors work and are controlled, before you continue, because I don't think you are understanding what I already said about the sync. Without that, it is basically just outputting currents in a fixed sequence, and the magnets on the rotor will try to follow that-if anything (like a load) interferes with that, it falls out of sync, and BEMF is now induced in conflicting patterns to the controller-induced currents, resulting in nearly random fluctuations in current thru the FETs, and voltage spikes as the currents coincide or conflict. It's pretty important that the controller know where the magnets are in relation to the stator poles, so that it can output the correct sequence and timing of currents to cause the right magnetic fields at the right times. I don't doubt that if you ran that on a power supply capable of much higher currents that you would have blown up the FETs already. Regarding not having any position feedback, that would certainly cause very high currents, and noise, vibration, etc. Even if they did, they have no reason to give it away. So they probably can't give you the code cuz they don't have it. AFAICT, most of the Chinese vendors claim to design and make their own stuff, but I really doubt they do-much much easier and cheaper to buy and "rebrand" (if they even bother with that) stuff made by just one or two of the few places that actually do design them, and resell it. I highly doubt that they make anything there-based on sales patterns and item availability (or lack thereof) and the delays filling orders (sometimes filling them with items notably different from what was supposed to be shipped), they are almost certainly just a handful of people finding and reselling various items.
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