Endless Sphere

Say it like it is, The only thing more impressive than getting this to work is that it's only taken you a few days to code and it's literally a few weeks since I was first making comments on your schematic. Really impressive. It took me a bit longer, but I started from complete scratch (with no exa...

You have roughly 40 times more samples and 1 extra bit, which equates to only 22 dB or 3.5 bit better performance than the ADC I use. The analog amplification and filtering will get you way more than that. With analog you can really bring down the main motor powering signals and have a lot of amplif...

For the 0 or 180 determination, I did not want to assume the rotor could actually move. What if it is locked solid with no movement, but you still want to generate a force in the coreect direction ? The 2nd order signal needs quite some current to see, though proper complex analog filtering (so one ...

The paper had quite a bit of math in it that I didn't fully understand. However, I understood enough of it to implement an improved sensorless FOC algorithm that could reliably determine the motor's position, including the leading 180 degrees, from standstill. Instead of varying the PWM amplitude o...

Sorry, I am not adding any new code. The whole reason for publishing the source code is that I dont need to continue with it. I broke down my hobby table where I did all my development, so cannot run any tests anymore. Its my home office table now...

I got some time to play with motor settings some more. So i figured something that is quite obvious, but it diddnt occure to me before. Lebowski inverter has option to save hall sensor position in case of errors and ovrcurrent events. Also manual position saving is performed for sensor calibration....

Chalo wrote: ↑

Nov 23 2020 9:10pm

E-HP wrote: ↑

Nov 23 2020 9:01pm

Welcome back!

Thanks!

Welcome !!!

If you make the winding basically a big circle around the axle, wont you induce eddy currents and losses in the axle iron ?

Right, RS232 can go down to -15V, and requires at least -3V for logic high. What I'm wondering is why the signals are called RS232 in the schematic. They look to me like just 0 to 5V signals, albeit inverted with NPN inverters. Old school 9 pin RS232 give out inverted signals wrt the microcontrolle...

In a hypothetical situation the motor could always rotate faster during one part of the electrical cycle and slower during the other. Then v_alpha would not necessarily integrate to zero. But I think the observer would still work because of the additional terms in the update equation. Not the case....

What you want is as much power into the recipient of this power with minimum losses. This means that for the recipient the voltage and current vector have to be in phase (cos phi = 1). When powering the motor this means FOC, or, the current vector must line up with the BEMF vector. In regen this mea...

Maybe you can convince Justin to talk yo ASI to change the regen mode ?

Simply put, for highest efficiency cos(phi) has to be 1 for the device receiving the power. So during accelleration this means FOC (as the motor receives the power) and during regen it has to be SOC (as the battery receives the power). The (now open source) Lebowski controller has FOC for powering a...

good chance that the regen is not implemented correctly for max efficiency... regen should be done with Stator Oriented Control for max energy recuperation, not with Field Oriented Control.

Have you guys seen the first few episodes of 'the long way up' ?

McGregor and Boorman are travelling on 2 HD lifewires from Ushuaia to LA. They are supported by Revian EV pickups.

And a diesel generator



P.s. bought a HD a few days ago, can post pictures if anyone interested.

I started something like this in 2016 but stopped for 2 reasons. First one was that it was a project to work on while I was unemployed, once I found a new job it got benched. And then I never restarted because, well, I have no use for a 1kA motor controller and was more interested in Sensorless From...

With the rotation in the error signals you have the 45 degree rotation in the control loop (giving you the stability) but not in the wanted Id and Iq (so you remain FOC). I have this 45 degree rotation in the error signals for both sensored and sensorless modes Lebowski, are you saying the 45 deg r...

To explain the 45 degree thing further, controlling real and imaginary current at the same time is basically a 2 dimensional control problem. To reach the steady state your updates need to 'walk' straight to the steady state point. However, the information telling your in which direction to walk is ...

Does it now run good, also with the fieldweakening etc ? Did you try at higher speeds ?

Cars are Greek to me .... but looks like something a setting in the controller will not fix

I have a 10kW hubmotor with no hub but with holes and threads for a disk brake lying around. An me602 I believe. I also have a 8kW Honda Wave 110 scooter in which the motor is not a load bearing member... replacing the 110cc unit with the hubmotor and a sprocket (attached using the threaded holes) c...

How about using fieldweakening, where the motor inductors kind of perform the job of the boost inductors ?

I still have rubbering shakes when i drive at speed. I tried to rebuild my speedo sensor and it is now out of the way of magnet collar. Feeling is kind of like you would drive on tiles. But when i investigated further it seems this only happens when i have the steering wheel centered or to the righ...

And, if I say so myself, the Lebowski setup has good field weakening.

You can run a SRM sensorless from start with full torque... the tech is what I uploaded here on ES. With a SRM everything is based on the wire inductances varying a lot with the rotor angle. The most difficult bit about a 5 phase controller is finding the appropriate micro processor, one that has 5 ...