Search found 174 matches

by pelle242
Nov 16 2012 7:10am
Forum: Motor Technology
Topic: Field Oriented Control using dsPic33
Replies: 173
Views: 32523

Re: Field Oriented Control using dsPIC33

What type of probes do you guys use when scoping controller waveforms? Is it safe to use the ones that typically comes with the scope for ~100V ?
by pelle242
Nov 13 2012 7:26am
Forum: Alternative Energy
Topic: Bio-mass gasifier
Replies: 38
Views: 9572

Re: Bio-mass gasifier

Yes the fuel must be homogenious and in small chunks or chips but is it unreasonable that a woodchipper is part of the setup? The budget is the only limit. So a chipper would not be to of the question of the total cost was good. Is there a seller of those units? As dauntless pointed out that pictur...
by pelle242
Nov 12 2012 3:15pm
Forum: Alternative Energy
Topic: Bio-mass gasifier
Replies: 38
Views: 9572

Re: Bio-mass gasifier

This one looks like it could handle continious use to me:

Image

Yes the fuel must be homogenious and in small chunks or chips but is it unreasonable that a woodchipper is part of the setup?
by pelle242
Nov 11 2012 2:22pm
Forum: Alternative Energy
Topic: Bio-mass gasifier
Replies: 38
Views: 9572

Re: Bio-mass gasifier

Search for GEK gasifier. The have plans and kits. Also they use the woodgas to driver a genset for electrisity.
by pelle242
Oct 28 2012 9:52am
Forum: Motor Technology
Topic: Field Oriented Control development boards
Replies: 95
Views: 13730

Re: Field Oriented Control development boards

I dont know how familiar you are with embedded sw development but pretty much all mcu/dsp (except for rellay small ones) have a high speed serial interface called JTAG. Initial it was intended for board level testing but has evolved into also beeing used for sw debugging. It allows a developer to re...
by pelle242
Oct 28 2012 8:58am
Forum: Motor Technology
Topic: Field Oriented Control development boards
Replies: 95
Views: 13730

Re: Field Oriented Control development boards

The way the TI eval kits usually work is that it comes with a limited version of their eclips based Code Composer Studio IDE. The limitation is typicaly that it only connects to the USB JTAG interface that is on the evm. So if you just want to play around with the evm you are good. However if you wa...
by pelle242
Oct 27 2012 12:52pm
Forum: Motor Technology
Topic: Field Oriented Control development boards
Replies: 95
Views: 13730

Re: Field Oriented Control development boards

Its all about the ecosystem, the tools, sample code, libs, reference projects, forums and communities. And without a contest the strongest embedded ecosystem out there is Arduino. Period. Just days ago they released the ARM based Due, it has a AT91SAM3X8E with everything you need for FOC. http://ard...
by pelle242
Aug 01 2012 5:19am
Forum: E-Bike Technical
Topic: Most cost effective, timely method of matching 350 M1 cells.
Replies: 8
Views: 1447

Re: Most cost effective, timely method of matching 350 M1 ce

You can just charge them and match them after their resting voltage. Is supposed to be good enough according to several posts on ES.
by pelle242
Jun 23 2012 1:24pm
Forum: E-Bike General Discussion
Topic: New user looking for feedback
Replies: 7
Views: 666

Re: New user looking for feedback

My fairly modest setup does 53km/h on flat ground no pedling, clocked with both bike computer and GPS. It's a cellman mxus DD hub (9C clone, not sure what wind) in a 26" wheel, 12FET infineon controller and a 18S4P A123 M1 pack (not from cellman). The wattsup meter says 48 amps max . With 18S lipo a...
by pelle242
Jun 20 2012 10:07am
Forum: Battery Technology
Topic: Making a bulk charger.
Replies: 17
Views: 1507

Re: Making a bulk charger.

just note that bms tacks on heafty shipping $100+....
by pelle242
Jun 19 2012 6:50am
Forum: E-Bike Technical
Topic: USB Charging Port
Replies: 8
Views: 800

Re: USB Charging Port

"most" 120 to 240 volt AC switched power supplies will actually work with DC and lower voltages. So simply take a spare USB charger and hook it up to your battery and see what happens, chances are it will work just fine. Just to be safe check the output with a volt meter before you plug in your phone.
by pelle242
Jun 15 2012 1:45pm
Forum: EV Business World
Topic: Consortium to Buy Saab Automobile, nytimes
Replies: 4
Views: 2000

Re: Consortium to Buy Saab Automobile, nytimes

Its not 100% clear but i dont think they got the name. Saab was originaly part of a larger company doing heavy trucks and aero. When the cars wad sold to gm the name was licensed to them and is not part of the saab holdings.
by pelle242
Jun 15 2012 3:38am
Forum: EV Business World
Topic: Consortium to Buy Saab Automobile, nytimes
Replies: 4
Views: 2000

Re: Consortium to Buy Saab Automobile, nytimes

Swedish media is quite skeptic about this new owner, very few real answers on what they actually bring and if they really have the financial means to pull this trough. The short story is that they will build an all electric version of the Saab 9-3. There exists a prototype car with a 135Kw engine an...
by pelle242
Jun 10 2012 6:41am
Forum: Motor Technology
Topic: 29mm to 35mm to 50mm -> My evolution to the Cromotor
Replies: 198
Views: 24214

Re: 29mm to 35mm to 50mm -> My evolution to the Cromotor

What are you using to cut your own spokes? Hozan?
by pelle242
May 18 2012 2:34am
Forum: E-Bike General Discussion
Topic: Is this a deal or what ......
Replies: 54
Views: 5083

Re: Is this a deal or what ......

As before, if people have a problem report it to Aliexpress. They have a reputable escrow arrangement that I know works very well, and which offers similar levels of protection to that we are used to in the west. Can you elaborate on this? From what I have heard before and from a quick google the e...
by pelle242
Apr 28 2012 10:48am
Forum: E-Bike Technical
Topic: 24 MOSFET controller... is it worth it?
Replies: 10
Views: 516

Re: 24 MOSFET controller... is it worth it?

If they wont do paypal stay away...
by pelle242
Apr 19 2012 7:51am
Forum: E-Bike Technical
Topic: Volts vs range?
Replies: 6
Views: 483

Volts vs range?

Lets say I have a hypothetical ebike with a 12S4P battery and at full throttle I get a certain speed S and range R miles from it (lets say no hills).
Then if I reconfigure the battery to 24S2P instead, and drive at the same speed with less throttle(half?) how would the range be affected?
0.5R? 0.9R?
by pelle242
Apr 10 2012 12:48pm
Forum: E-Bike General Discussion
Topic: E-trike for disabled youth
Replies: 70
Views: 3878

Re: E-trike for disabled youth

Get her a kmx storm or cyclone, a small geard hub motor like a cute in the rear wheel and some lipo and she will own the neighborhood.....:)
by pelle242
Apr 03 2012 2:51pm
Forum: Motor Technology
Topic: Re: 5KW 72V Controller 36 #4410 FET's, $108 #4110's $154
Replies: 204
Views: 31152

Re: 5KW 72V Controller 36 #4410 FET's, $108 #4110's $154

I did some reasearch from the original Hua Tong thread and concluded that the MCU was a rather old NEC / Renesas part. It is a completely different one from the infineon and not likely any existing programing software will do any good.
by pelle242
Mar 29 2012 7:15am
Forum: Battery Technology
Topic: 63v bulk charger - what are my options
Replies: 22
Views: 1439

Re: 63v bulk charger - what are my options

Get a 12V meanwell and run in series would seem to be the logical step.
by pelle242
Mar 29 2012 2:31am
Forum: Battery Technology
Topic: Need help with ebay charger voltage adjust
Replies: 7
Views: 769

Re: Need help with ebay charger voltage adjust

Go buy a kingpan 5a or larger. You would have to turn that down lower than full charge to be safe. You spend the money on your cells so pay for a bulk charger. Where? The only place I found chargers was bmsbattery.com but their shipping to europe is insane. Also I am not sure how long I will stick ...