Search found 3033 matches

by Lebowski
Dec 15, 2017 1:44 am
Forum: Motor Technology
Topic: Time for MORE POWER! 1400a 1200v IGBT controller build!
Replies: 54
Views: 1919

Re: Time for MORE POWER! 1400a 1200v IGBT controller build!

Man you got some cool stuff there ! :D
by Lebowski
Dec 14, 2017 7:56 am
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 40
Views: 772

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.
by Lebowski
Dec 13, 2017 3:04 pm
Forum: Motor Technology
Topic: Another SMD lebowski PCB
Replies: 100
Views: 4086

Re: Another SMD lebowski PCB

Try calculating their cost by weight... :shock:
by Lebowski
Dec 12, 2017 9:17 am
Forum: Motor Technology
Topic: Another SMD lebowski PCB
Replies: 100
Views: 4086

Re: Another SMD lebowski PCB

I once suggested a clothes iron for SMD soldering instead of an oven, Futterama had good results with this: https://endless-sphere.com/forums/viewtopic.php?f=30&t=57375&p=985232&hilit=iron#p985225 Basically back in my Research days they were curing plastic chips with simple clothes irons, as the (ol...
by Lebowski
Dec 10, 2017 2:27 pm
Forum: Motor Technology
Topic: Which controller?
Replies: 3
Views: 83

Re: Which controller?

Have a search on this forum for 'lebowski controller'
by Lebowski
Dec 09, 2017 3:34 pm
Forum: General Discussion
Topic: Worst Crashes/Accidents/Failures etc on E-bike: Bring pics
Replies: 133
Views: 15592

Re: Worst Crashes/Accidents/Failures etc on E-bike: Bring pics

Just saw this episode... apparently the car kept bursting into flames for days...

I recognised some of the road and scenery :D
by Lebowski
Dec 06, 2017 8:04 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38716

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

What you can do to improve the throttle is to add your own u-controller which takes in the analog throttle signals, process those till you have the behavior you want and send the info to the controller IC over CAN bus....
by Lebowski
Dec 05, 2017 2:56 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 12
Views: 347

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

One thing I also like about the 247's is that you can use normal screws to attach them to the heatsink as the hole though the package is non-conducting. You only need some Kapton tape or heat conducting pad or something for drain isolation, no plastic screws or fiddly plastic washers. Took a screens...
by Lebowski
Dec 04, 2017 9:24 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 12
Views: 347

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

I plan to use through hole resistors... I got a gazillion of those from when ST-Ericsson closed down here, makes it easy to experiment and find the correct values for the type of FETs. Another reason is that I do not have too much faith (for high currents) in PCB via's, I always try to switch PCB la...
by Lebowski
Dec 04, 2017 6:29 am
Forum: General Discussion
Topic: Where will You Work in a Few years?
Replies: 9
Views: 198

Re: Where will You Work in a Few years?

I will no longer work in a few years, except maybe the occasional short term contract when I feel like it. Already have enough stashed away to quit and buy a house in the sun. My girlfriend though wants to work for another year or two to put her kids through university, this is the only reason why I...
by Lebowski
Dec 01, 2017 4:53 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 12
Views: 347

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

3d mockup of lebowski proposed board2.png This is a mockup made by Whereswally606 showing the general idea. Based on the size of the power stage and gate drivers I will need to think what to do about the processor board. I can lay it flat above or below the PCB, or stand it up straight. I'm thinkin...
by Lebowski
Nov 30, 2017 1:53 am
Forum: Motor Technology
Topic: Another lebowski Controller
Replies: 3
Views: 173

Re: Another lebowski Controller

A handy tip for unknown components is to search for them at digikey.com . There the datasheet for the 6N137 shows that it actually contains some circuitry, a lot more than the simple transistor/diode from the symbol in your schematic. Ignoring the symbol, Zombiess schematic is correct. Pin 7 is an e...
by Lebowski
Nov 27, 2017 12:42 pm
Forum: Motor Technology
Topic: build your very own Lebowski controller !
Replies: 284
Views: 34250

Re: build your very own Lebowski controller !

I'm an analog mixed signal IC design engineer (22 years now). To give some examples, for work once I designed the receive ADC in a mobile phone. Also once build a complete audio path, digital 16bit in headphone out, over 103dB dynamic range, also for mobile phone. Since it is IC design, this means e...
by Lebowski
Nov 27, 2017 7:00 am
Forum: Motor Technology
Topic: Show off your lebowski controller
Replies: 20
Views: 622

Re: Show off your lebowski controller

I only have a 50W iron, temp regulated by a magnet in the tip. A bigger tip gets hotter for some reason, probably due to different magnetic properties. I do need to hold it for quite long, 10 to 20 seconds easy, for the big parts to heat up enough. Also, check your solder. I once by accident bought ...
by Lebowski
Nov 27, 2017 6:00 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 12
Views: 347

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

The basic setup I have in mind: DSC02006-800x800.jpg On the top left the orange square is PCB copper on both sides of the PCB. Black circles / blue squares are xxx uF and yyy nF caps, one leg going through the PCB soldered to the bottom copper and the other leg bend flat soldered on the top copper. ...
by Lebowski
Nov 27, 2017 5:51 am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 12
Views: 347

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

This thread is for a power section that is designed to work with the processor board described in this thread: https://endless-sphere.com/forums/viewtopic.php?f=30&t=87104 The basic idea is to have an easy to solder PCB with a connector for Bob's board. The power PCB will have a simple low inductanc...
by Lebowski
Nov 26, 2017 2:33 pm
Forum: Motor Technology
Topic: Another SMD lebowski PCB
Replies: 100
Views: 4086

Re: Another SMD lebowski PCB

I mean that looks all nice and advanced etc, but will be extremely hard for the average hobbyist to build at home. Me for instance I have a 1960s soldering iron, all this small SMT stuff is undoable. I am thinking about designing a simple all through-hole 6 FET powerboard to go with Bobc's processor...
by Lebowski
Nov 23, 2017 9:36 am
Forum: Motor Technology
Topic: Show off your lebowski controller
Replies: 20
Views: 622

Re: Show off your lebowski controller

And if I'm correct you're running a mid-drive MAC with field weakening and crazy high erpms ?
by Lebowski
Nov 21, 2017 1:23 pm
Forum: General Discussion
Topic: MUSIC thread
Replies: 136
Views: 8576

Re: MUSIC thread

Since nice ladies (especially the Victoria Secret ones) are all the rage and in the news : 3mCeEYExo_g Another video to recommend from this same group is 'was ist hier los', this one requires a stronger stomach: BGthmYzpGv0 The text is very good but, well, in German... (I mean who doesn't speak Germ...
by Lebowski
Nov 21, 2017 6:12 am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1649
Views: 131450

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

Yes, regen can be controlled via the CAN bus. As with the analog case, the CAN bus shares two throttle values which can independently be configured for power or regen (by choosing the sign of the throttle coefficients, negative for regen).
by Lebowski
Nov 20, 2017 3:45 pm
Forum: E-Bike Technical
Topic: MAC + Phaserunner + CA3, sometimes doesn't start
Replies: 12
Views: 331

Re: MAC + Phaserunner + CA3, sometimes doesn't start

Izeman now has good results with his mid-drive MAC and a Lebowski controller (built by Animalector)...
by Lebowski
Nov 18, 2017 5:30 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38716

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Yep very nice video :D thanks for posting this link !
by Lebowski
Nov 15, 2017 3:20 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38716

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp

Arlo1 wrote:Man I am really stuck on trying to figure out a video ripper. I found lots of them that work on youtube but nothing that works to rip that episode.

I will ask for a copy on a flash-drive like Drbass did.
Aren't there programs that just video-record your entire computer desktop ?
by Lebowski
Nov 14, 2017 2:09 pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38716

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp

'Not avaliable for viewing in your region'.... :(
by Lebowski
Nov 08, 2017 1:43 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38716

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp

The idea behind a spread spectrum clock is to not have a single strong (interference causing) frequency but to have many much smaller ones. 3503Fig03.gif The clock source driving the PWM (or the entire controller processor), standard you would have a single tone for your clock like the blue curve ab...