Endless Sphere

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 ...

john61ct wrote: ↑

May 12 2020 9:32am

Also, any clarification as to how "true FOC" can work in a sensorless setup would be greatly appreciated.

You can read the explanation of my stuff here :
viewtopic.php?f=30&t=104895#p1533225

I used caps per schematic... 1nf if I recall correctly. Should I use less? I dont use any 4K7 pullups since sensors provide push pull signal of their own. I will remove hall assisted setting and test again. BR I think the advanced chip you use is sensitive to the magnet being exactly centered above...

I would not use hall assisted sensorless, then try again. It sounds like the halls cant keep up with the higher motor speed or you have too much caps on the hall lines. Sensorless should be fine.

Just saw the post on your leafdriveblog about backing out and throttle being twitchy. What you can do is in the throttle menu, change coefficients from1,0,0 (which is linear throttle, so .5 throttle gives you .5 torque) to 0,1,0 which is quadratic throttle (so 0.5 throttle gives 0.25 torque). This s...

i have not worked a lot with IPM motors. a little with axial flux. but mostly SPM and separately excited. so this whole salience thing, the details of making it ACTUALLY work is mostly new to me. we were using a fixed 45deg angle just for quick test and got really good results, better than was expe...

Arlo1 wrote: ↑

May 06 2020 9:12am

45 deg rotation in the error signals but not 45 deg in the NON ERROR signals?

I don't know if it is clear what I do, but I posted an explanation here :
viewtopic.php?f=30&t=104895&p=1553063#p1553063