Search found 3121 matches

by Lebowski
Apr 17, 2018 1:04 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Yep, R18-23 for 4468's should be 4.7 Ohm, R12-17 should be 15 Ohm. R1, I dont know the value of this one yet, it is a filter resistor for the processor board supply. Ive been using 100 Ohm so far, but shorting it out should be ok too. Plan is to drop around 5V across this resistor, assuming the powe...
by Lebowski
Apr 14, 2018 12:32 pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1653
Views: 151867

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Busy with some extremely interesting stuff. DSC02111-800x800.jpg I've started programming on a different chip, one of the 33EV types. Goal is to have sensorless start with full torque at standstill. Relative (sensorless) position at standstill is quite easy, but to get absolute phase information req...
by Lebowski
Apr 14, 2018 11:54 am
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Did you just solder them ? You should be getting the correct values... did you add the pull up resistor ?
by Lebowski
Apr 14, 2018 5:55 am
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Did the chip correctly find two temp sensors ? Does it display the two identification codes ?

P.s. and its recommended to update the firmware to 2.A1
by Lebowski
Apr 13, 2018 4:04 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Just be meticulous and building the board should pose no problems. I would however add copper wire to the high current traces. Solder basically has about 10 times the resistance of the equivalent area of copper. So you need 10mm^2 of solder (a 2 mm thick layer on 5 mm wide traces) to get the equival...
by Lebowski
Apr 13, 2018 9:52 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Make sure you get the correct gate resistors for the Fet you are using.

Also, leave some room between Fets and PCB, this make it easier to replace a broken FET and for fattening uo the traces.
by Lebowski
Apr 10, 2018 9:50 am
Forum: Motor Technology
Topic: Arlo1 Inverter build for Emrax 268
Replies: 17
Views: 1032

Re: Arlo1 Inverter build for Emrax 268

Something that will help reduce the noise in drive_3 is to reduce this coefficient: n) immediate motor phase step: 48 in the control loop coefficients menu. You can set this coefficient all the way down to 0, but it may (or not) cause instability. I am not 100% sure this coefficient is absolutely ne...
by Lebowski
Apr 08, 2018 8:14 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki RF400E, now with Enertrac MHM602
Replies: 117
Views: 43414

Re: Suzuki RF400E, now with Enertrac MHM602

Looking at the slides your speed is voltage limited to 100kmh. I assume the Kelly controller does not have field weakening ?
by Lebowski
Apr 07, 2018 8:14 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

TI has it (and is the only one I think) but as far as I know has not published how it works... plus figuring out for myself is more fun :D
by Lebowski
Apr 07, 2018 5:05 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

This might become the next generation... depends on whether I get sensorless full torque at standstill working...

The power pcb makes for a nice development platform, only need to build a new processor board and can use the power pcbs output stage and current sensors.
by Lebowski
Apr 02, 2018 2:31 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

and this is where I keep assorted lengths of wire...
DSC02110-800x800.jpg
DSC02110-800x800.jpg (128.37 KiB) Viewed 391 times
by Lebowski
Mar 28, 2018 3:35 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

LLC ACS770ECB-200B-PFF-T (620-1538-5-ND) instead of LLC ACS770KCB-150B-PFF-T (620-1540-5-ND) Bas should we upgrade to this sensor since we look to all be opting for the 4468 fets and this gives us a bit of head room. Please check my comparison i think this is the direct equivalent upgrade, i dont w...
by Lebowski
Mar 22, 2018 8:22 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Just a warning regarding the ITXH180, they are limited to 75A by the max allowed leg current... They can probably do 180A pulses or something but only 75A RMS, so at low motor speed (maybe motor stuck ?) they are limited to 75A phase current.

Thanks emmgee for pointing this out to me :)
by Lebowski
Mar 20, 2018 3:06 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Any suggestions for replacing, it's out of Digikey stock: supply cap 270uF 3 565-4018-ND ? Is ripple current important or are the basic parameters enough (capacitance, voltage and dimensions)? BTW, ACS770-150B is pretty hard to find from other shops (Digikey stocks 2+k) I would just make a list at ...
by Lebowski
Mar 13, 2018 12:47 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 119
Views: 4630

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

For those thinking about stacking multiple power boards, there is a nice application note here on how to combine the outputs of current sensors. https://www.google.ru/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjAodrlsO7YAhULiywKHfOQBygQFggwMAE&url=http%3A%2F%2Fwww.allegromicro.com%2F~%2Fme...
by Lebowski
Mar 09, 2018 5:26 am
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 147
Views: 3958

Re: Specific heat absorption capacity of disc brakes

I have good regen :mrgreen: just not on this bike. This one is a non-ebike which I use 2-3 times a week to climb the local 350 m high hills. Then on the descent I am lightly on the brakes to keep speed around 40 kmh. I am happy that I didnt do a strong brake action, pushing through the rim locking t...
by Lebowski
Mar 09, 2018 3:16 am
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 147
Views: 3958

Re: Specific heat absorption capacity of disc brakes

I agree with Chalo about rim brakes... I mean disc brakes are getting larger and larger diameter, only a few more years till the disks are as large as the rims.... at which point everyone will realise rim brakes are basically disc brakes with the biggest disk possible. :shock: just went through the...
by Lebowski
Mar 07, 2018 3:47 am
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Would there be interest in an explanaition of how I look at an IPM motor ? It will involve lots of vectors and some math (trigonometry) but on a rather basic highschool level (I am a simpel dude). But it explains the comment / questions from Kiwifiat and why some IPM's are better for fieldweakening....
by Lebowski
Mar 05, 2018 5:34 pm
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Also for an IPM you want Id (i had to look that one up because all throught my code I use different terms, i use real and imaginary like you have with complex number theory) to be 0. But it depends on motor design and phase difference between saliency and backemf.... The algo i use automatically goe...
by Lebowski
Mar 05, 2018 3:09 pm
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Another stupid question : Will this run an induction motor? Nope, it runs BLDC and IPM (my own private FOC algorithm I use actually runs the Switched Reluctance part of an IPM motor correctly (so at max efficiency)). It should also run an SR motor for as long as you don't remove the throttle curren...
by Lebowski
Mar 05, 2018 3:06 pm
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Great thanks. I'll do some more experiments. I'm keen to get a solution for using ev motor resolvers. Any plans for digitally interfacing a resolver to digital converter? At the moment not... all pins on the chip are in use so there's just nowhere to connect to. I am thinking about switching over t...
by Lebowski
Mar 05, 2018 5:32 am
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Great thanks. I'll do some more experiments. I'm keen to get a solution for using ev motor resolvers. Any plans for digitally interfacing a resolver to digital converter? At the moment not... all pins on the chip are in use so there's just nowhere to connect to. I am thinking about switching over t...
by Lebowski
Mar 05, 2018 3:46 am
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Hex attached Some suggestions that should improve things: In the PWM menu you have a) PWM frequency: 8kHz b) deadtime: 1999ns c) dutycycle testsignal: 1748% d) toggle high side polarity, now active HIGH e) toggle low side polarity, now active HIGH f) test PWM signals g) autocomplete h) loop sample ...
by Lebowski
Mar 04, 2018 2:46 pm
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 376
Views: 41189

Re: build your very own Lebowski controller !

Braking current ?

Just curious, can you post the hex ?