Recent content by Mihai_F

Well the duty mode was just incrementing/decrementing Vq thru a time constant buffer (no PID). The sensored observer at startup just gives 6 angles, one for each middle sector (like 6 step commutation), but now i working on implementing to get real angles from it. I tried (sensorless after...

here are a few more photos, the development controller, a small high speed test brushless motor , and other stuff. last pic is keyway broaching on manual lathe about 100 passes (0.040 each) for a 4mm keyway, diy tool also.

Hy there, I bought 5000mAh hobby king cells to replace the 2 dead cells from the battery. I chose the same cells again, because I have 2 packs 3s and 4s that are 9yrs old (same batch as my ultralight plane batt) and i abused the heck out of them on my rc car and plane the past 3-4 yrs they...

Hy there, I will present here my electric drift trike build, with details for mechanical and electrical parts. It all started after i decided to migrate my projects to STM32, then started to make my FOC code and controller, here is the FOC thread FOC questions So i needed a "vehicle" to test my...

I only plan to use sensor for start up, to know the initial angle, i did some test and it works, but i'm having trouble with sensorless switchover. It starts with halls, great torque, kinda jerky, then (at about 100rpm) transitions to sensorless witch works good, even down to verry low RPM. One...

That is very similar how i implemented it in my 300A EPS aircaft controller, but BLDC tarp waveform, with adaptive timing advance. There was a lot of filtering needed for checking hall input fi valid or not because of noise...lots of "PITA", in the end works nice, now i plan to migrate it to FOC.

Hy, thanks for you last response, that cleared the things a bit. Now, can you explain a bit the hall sensor implementation (principle) in MESC software, how do you get from hall pulses to rotor angle? I seen that you measure the time tick (pwm cycles between hall states), but i'm a bit lost in...

the cells that would use are made by LG chem lithium NMC/ NCM712,- pouch rectangular, and will be ider individual or from vw id batt module, a pack with about 100 to 120Ah 50 to 64 kg 22 or 24s in order to have about 80-90 min flight time. I found some sources here in europe that have LG chem...

Hi there, I managed this weekend to get one more flight (30min) out of my battery (21s left), it held 14 to 12kw for 4minutes, then 7kw for almost the rest of the flight. All monitored parameters ware in spec, and about toward the end of flight, all cells reached 3,3v to 3,4v about the same...

Hy guys, I have some questios regarding FOC operating modes, speed, duty, torque. So far in my implementation PID controlled the Vd comand in order to keep Id at 0. Vq directly controlled by throttle input gives duty mode. I tried Vq thru PID and it worked like torque mode, throttle input...

updated prices

A bit of an update. Battery degradation after 9years, stored at 20degC and at 3,8V/cell most of its life, it had a total of 10 cycles on it. One year ago it started to die, first 2 cells at once went to 0v over a time of 1 month (at that time i was doing batt measurements in storage once a...

Hello Guys! Due to some personal reasons i have to sell my project, all its contents. https://endless-sphere.com/sphere/threads/selling-22kw-motor.123123/

Hello Guys! Due to some personal reasons i have to sell my project, all its contents. This is my project: 20Kw motor and 300A ESC (ultralight aircraft propulsion system) Here is what i'm asking for my propulsion system, detailed description is in the upper link on the first pages. BLDC...

Here i found a good explanation for some winding "type" decisions. These guys know they're business well. Also a very good explanation of skin effect in conductors. Enjoy.