Search found 3321 matches

by Lebowski
Nov 24 2020 11:02am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD issue with 48v battery
Replies: 7
Views: 223

Re: BBSHD issue with 48v battery

Chalo wrote:
Nov 23 2020 9:10pm
E-HP wrote:
Nov 23 2020 9:01pm
Welcome back!
Thanks!
Welcome !!!
by Lebowski
Nov 17 2020 5:04am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1318
Views: 118945

Re: APL's DIY axial-flux motor

If you make the winding basically a big circle around the axle, wont you induce eddy currents and losses in the axle iron ?
by Lebowski
Nov 17 2020 1:54am
Forum: Motor Technology
Topic: Another SMD lebowski PCB
Replies: 144
Views: 20411

Re: Another SMD lebowski PCB

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...
by Lebowski
Nov 15 2020 2:21pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 69
Views: 4327

Re: True FOC: definition and examples

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....
by Lebowski
Oct 08 2020 10:31am
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 53484

Re: Analysis of regen on an ebike

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...
by Lebowski
Oct 06 2020 2:13am
Forum: Motor Technology
Topic: FOC for power and SOC (Stator Oriented Control) for regen?
Replies: 6
Views: 568

Re: FOC for power and SOC (Stator Oriented Control) for regen?

Maybe you can convince Justin to talk yo ASI to change the regen mode ?
by Lebowski
Oct 05 2020 2:29pm
Forum: Motor Technology
Topic: FOC for power and SOC (Stator Oriented Control) for regen?
Replies: 6
Views: 568

Re: FOC for power and SOC (Stator Oriented Control) for regen?

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...
by Lebowski
Sep 24 2020 1:21pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 53484

Re: Analysis of regen on an ebike

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.
by Lebowski
Sep 22 2020 3:14pm
Forum: EV Business World
Topic: EV's on The Long Way Up
Replies: 14
Views: 817

EV's on The Long Way Up

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.
by Lebowski
Aug 11 2020 9:28am
Forum: Motor Technology
Topic: I'm looking for developers/engineers interested in high current (+1kA) controller development
Replies: 11
Views: 871

Re: I'm looking for developers/engineers interested in high current (+1kA) controller development

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...
by Lebowski
Jun 13 2020 2:32am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 482
Views: 111549

Re: Axiom: a 100kW+ motor controller

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...
by Lebowski
Jun 13 2020 2:31am
Forum: Motor Technology
Topic: Lebowski controller IC 2.B0 source code and (short) explanation
Replies: 36
Views: 3112

Re: Lebowski controller IC 2.B0 source code and (short) explanation

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 ...
by Lebowski
May 24 2020 12:53am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 151
Views: 13336

Re: Ampera/Volt inverter with Lebowski brain

Does it now run good, also with the fieldweakening etc ? Did you try at higher speeds ?
by Lebowski
May 23 2020 2:11pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 151
Views: 13336

Re: Ampera/Volt inverter with Lebowski brain

Cars are Greek to me .... but looks like something a setting in the controller will not fix :roll:
by Lebowski
May 20 2020 2:43pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: What Strange Build do YOU have Bubbling inside?
Replies: 12
Views: 819

Re: What Strange Build do YOU have Bubbling inside?

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...
by Lebowski
May 17 2020 3:19pm
Forum: E-Bike General Discussion
Topic: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER
Replies: 12
Views: 532

Re: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER

How about using fieldweakening, where the motor inductors kind of perform the job of the boost inductors ?
by Lebowski
May 16 2020 11:34pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 151
Views: 13336

Re: Ampera/Volt inverter with Lebowski brain

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...
by Lebowski
May 15 2020 12:33pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50KW controller with field weakening
Replies: 10
Views: 501

Re: 50KW controller with field weakening

And, if I say so myself, the Lebowski setup has good field weakening. :wink:
by Lebowski
May 13 2020 1:41pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1318
Views: 118945

Re: APL's DIY axial-flux motor

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 ...
by Lebowski
May 12 2020 10:00am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 69
Views: 4327

Re: True FOC: definition and examples

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
by Lebowski
May 09 2020 1:31pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 151
Views: 13336

Re: Ampera/Volt inverter with Lebowski brain

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...
by Lebowski
May 09 2020 11:39am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 151
Views: 13336

Re: Ampera/Volt inverter with Lebowski brain

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.
by Lebowski
May 07 2020 1:44pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 151
Views: 13336

Re: Ampera/Volt inverter with Lebowski brain

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...
by Lebowski
May 07 2020 7:52am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 482
Views: 111549

Re: Axiom: a 100kW+ motor controller

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...
by Lebowski
May 06 2020 10:34am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 482
Views: 111549

Re: Axiom: a 100kW+ motor controller

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