Search found 3328 matches
- Feb 24 2021 2:46pm
- Forum: Motor Technology
- Topic: Another attempt at building a motor controller
- Replies: 92
- Views: 2171
Re: Another attempt at building a motor controller
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...
- Feb 23 2021 4:05pm
- Forum: Motor Technology
- Topic: Another attempt at building a motor controller
- Replies: 92
- Views: 2171
Re: Another attempt at building a motor controller
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...
- Feb 23 2021 4:07am
- Forum: Motor Technology
- Topic: Another attempt at building a motor controller
- Replies: 92
- Views: 2171
Re: Another attempt at building a motor controller
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 ...
- Feb 22 2021 3:12pm
- Forum: Motor Technology
- Topic: Another attempt at building a motor controller
- Replies: 92
- Views: 2171
Re: Another attempt at building a motor controller
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...
- Jan 09 2021 3:10pm
- Forum: Motor Technology
- Topic: Lebowski controller IC 2.B0 source code and (short) explanation
- Replies: 48
- Views: 4250
Re: Lebowski controller IC 2.B0 source code and (short) explanation
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...
- Dec 16 2020 11:43am
- Forum: Motor Technology
- Topic: Ampera/Volt inverter with Lebowski brain
- Replies: 157
- Views: 14546
Re: Ampera/Volt inverter with Lebowski brain
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....
- Nov 24 2020 11:02am
- Forum: EBike Non-hub Motor Drives
- Topic: BBSHD issue with 48v battery
- Replies: 8
- Views: 427
- Nov 17 2020 5:04am
- Forum: Motor Technology
- Topic: APL's DIY axial-flux motor
- Replies: 1427
- Views: 126402
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 ?
- Nov 17 2020 1:54am
- Forum: Motor Technology
- Topic: Another SMD lebowski PCB
- Replies: 150
- Views: 21562
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...
- Nov 15 2020 2:21pm
- Forum: Motor Technology
- Topic: True FOC: definition and examples
- Replies: 77
- Views: 5562
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....
- Oct 08 2020 10:31am
- Forum: EBike Technical
- Topic: Analysis of regen on an ebike
- Replies: 151
- Views: 54971
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...
- Oct 06 2020 2:13am
- Forum: Motor Technology
- Topic: FOC for power and SOC (Stator Oriented Control) for regen?
- Replies: 6
- Views: 607
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 ?
- Oct 05 2020 2:29pm
- Forum: Motor Technology
- Topic: FOC for power and SOC (Stator Oriented Control) for regen?
- Replies: 6
- Views: 607
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...
- Sep 24 2020 1:21pm
- Forum: EBike Technical
- Topic: Analysis of regen on an ebike
- Replies: 151
- Views: 54971
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.
- Sep 22 2020 3:14pm
- Forum: EV Business World
- Topic: EV's on The Long Way Up
- Replies: 14
- Views: 1004
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.
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.
- Aug 11 2020 9:28am
- Forum: Motor Technology
- Topic: I'm looking for developers/engineers interested in high current (+1kA) controller development
- Replies: 13
- Views: 1136
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...
- Jun 13 2020 2:32am
- Forum: Motor Technology
- Topic: Axiom: a 100kW+ motor controller
- Replies: 483
- Views: 116156
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...
- Jun 13 2020 2:31am
- Forum: Motor Technology
- Topic: Lebowski controller IC 2.B0 source code and (short) explanation
- Replies: 48
- Views: 4250
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 ...
- May 24 2020 12:53am
- Forum: Motor Technology
- Topic: Ampera/Volt inverter with Lebowski brain
- Replies: 157
- Views: 14546
Re: Ampera/Volt inverter with Lebowski brain
Does it now run good, also with the fieldweakening etc ? Did you try at higher speeds ?
- May 23 2020 2:11pm
- Forum: Motor Technology
- Topic: Ampera/Volt inverter with Lebowski brain
- Replies: 157
- Views: 14546
Re: Ampera/Volt inverter with Lebowski brain
Cars are Greek to me .... but looks like something a setting in the controller will not fix 

- May 20 2020 2:43pm
- Forum: E-Scooter and Motorcycle General Discussion
- Topic: What Strange Build do YOU have Bubbling inside?
- Replies: 12
- Views: 844
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...
- May 17 2020 3:19pm
- Forum: EBike General Discussion
- Topic: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER
- Replies: 12
- Views: 601
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 ?
- May 16 2020 11:34pm
- Forum: Motor Technology
- Topic: Ampera/Volt inverter with Lebowski brain
- Replies: 157
- Views: 14546
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...
- May 15 2020 12:33pm
- Forum: E-Scooter and Motorcycle General Discussion
- Topic: 50KW controller with field weakening
- Replies: 10
- Views: 549
Re: 50KW controller with field weakening
And, if I say so myself, the Lebowski setup has good field weakening. 

- May 13 2020 1:41pm
- Forum: Motor Technology
- Topic: APL's DIY axial-flux motor
- Replies: 1427
- Views: 126402
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 ...