Recent content by krumpi

You are 1year younger then I am! :o I thought about the principle of field weakening used in that patent - compare BEMF and referent value, and if difference is small, field will be weakened, but if difference isn't so small, field will be increased to gain required torque.

Last night (on work :D ) I've found interesting patent related to automatic field weakening, using discrete electronic parts (it's from 1980.!). Think that widodo is using something similar, but with processor.

At 48V, field connected to separate 12V bat, my setup draws 3.05A. Axle braked with pliers over leather glove (to protect surface) draws not more than 8A, I can't stop it no matter how hard I press. Well, it's on bare axle, 17mm, I know that torque is directly proportional to radius. I have to...

I did some "research", too. Seams that advancing does the same thing as field weakening, but all of them suggest that field weakening or advancing should be done to reach speed above nameplate value, if maximal torque isn't needed. The principle of advancing is - it increases "opposite" BEMF...

I've used simple, experimental method to determine hall position- first manually switched phase sequence to determine "electric degrees" though it was already calculated. Then I've marked static positions of rotor in corresponding stator sequence, and positioned hall sensors according to...

Slight advancing halls is a way to make motor to achieve higher speeds, but current rises, and running in reverse is problematic, because phase shifting comes too late. Advancing is used on rc models, running in one direction, but I think it's not for us on ev. I've used dremel-like tool to...

Yes, dimensions is the right word. :oops: Black hole in my mind is bigger and bigger :roll: :D Interesting, when I write in English, I think in English too, but when it comes to that thing that I can't find the right word, I have a picture in mind, without corresponding word, not in English...

Yes, it isn't smaller than alternator used in my current car, and it's rated 75A, and the one I've converted is 42A. Gabarites (LxWxH) is not right word? Or not too often used? Sorry, in every post I have to check my spelling, and my vocabulary is short, although I read English texts a few hours...

Good morning! :D It's a small alternator, it was running on a two-stroker. Small in power, not in gabarites. Here are my pictures :

It has 12 fets, but ICs are not from any of controllers seen on forum. I've ordered it 2008., and it was sitting unused till last summer, when I used it for my alternator conversion and experimenting with it. I know it is too weak to drive alternator powered bike or scooter, so it must be moded...

Hello! This is my first post, and I am not trying to steel your thread. I've converted small alternator last summer, but it's still on the table, I have no time to build a vehicle for it. If I saw correct, your (Mr Widodo) hall-sensors are in the "claws" of the stator. My sensors are between...