Search found 3147 matches

by Lebowski
Aug 15 2011 11:01am
Forum: Motor Technology
Topic: 2-phase motor / controller idea any good?
Replies: 8
Views: 889

Re: 2-phase motor / controller idea any good?

Building a custom motor is no problem :D I also build my current 3-phase motor from scratch. Am looking into AC induction type motor..... What is the whole idea behind sinusoidal PWM, isn't it fo have a constant phase current ? Wouldn't it be easier to measure the motor current with a high-bandwidth...
by Lebowski
Aug 15 2011 10:57am
Forum: General Discussion
Topic: China costs start to worry U.S. multinationals
Replies: 26
Views: 1986

Re: China costs start to worry U.S. multinationals

I rather have US's quality control is so superior. Lets not exaggerate OK :roll: to explain: I got a 1979 Harley FXS and a 1982 FXB.... Your old motorized jewelry may have a habit of falling apart. Beginning @ 2000 something like 50% of Harley parts are made in China. While touring on Goldwings, si...
by Lebowski
Aug 15 2011 6:31am
Forum: Motor Technology
Topic: 2-phase motor / controller idea any good?
Replies: 8
Views: 889

Re: 2-phase motor / controller idea any good?

You could debate what the best name for configuration you're describing is - 2 phase, 4 phase, or something else. However, to control that configuration you would need an H-bridge for each coil pair. That's 4 FET pairs as opposed to the 3 pairs you'd need for a regular 3-phase design. What's the ad...
by Lebowski
Aug 15 2011 3:29am
Forum: General Discussion
Topic: China costs start to worry U.S. multinationals
Replies: 26
Views: 1986

Re: China costs start to worry U.S. multinationals

chroot wrote:I rather have US's quality control is so superior.
Lets not exaggerate OK :roll:

to explain: I got a 1979 Harley FXS and a 1982 FXB....
by Lebowski
Aug 15 2011 2:23am
Forum: Motor Technology
Topic: Not simple BLDC controller It RUNS! :)
Replies: 574
Views: 52251

Re: Not simple BLDC controller

Just a quick post with the assembler and pinout of the 16F88 sensorless controller that is used in combination with the driver stage I posted earlier. pinout.JPG the assembler is plain ascii but I cannot post a .txt file, therefore changed extension to .doc (but can better be viewen in Notepad) nmos...
by Lebowski
Aug 14 2011 12:58pm
Forum: Motor Technology
Topic: Not simple BLDC controller It RUNS! :)
Replies: 574
Views: 52251

Re: Not simple BLDC controller

Well my setup is for a lame little girly bike :oops: 'cause the cops here in switzerland are not the little girlies they have in the USA :D so I want to keep stuff legal. Yeah, right... they dress up in poofy frocks and wanker hats and party with the poofter priests in the Vatican... :lol: poofters...
by Lebowski
Aug 14 2011 12:56pm
Forum: Motor Technology
Topic: Not simple BLDC controller It RUNS! :)
Replies: 574
Views: 52251

Re: Not simple BLDC controller

Ok so whats the best Chip we can look at for this it seems the dsPIC30F3010-30I/SO is pretty good. It would be nice to get one I don't have to solder so I can yank it from a blown board and move it to the next. Any other good PICs or dsPICs to look at other then what bigmoose pointed out? Maybe ano...
by Lebowski
Aug 13 2011 2:54am
Forum: Motor Technology
Topic: Not simple BLDC controller It RUNS! :)
Replies: 574
Views: 52251

Re: Not simple BLDC controller

Ahh, I see I'm not the only one using PMOS devices :). I'm developing an h-bridge for a 250W DC-brushed motor (some details in this post ) and used IRF4905 , the PMOS with the lowest RDSON (20mOhm) I could find and get. The current reading part of your schematics, is for alarm only or "continuous" ...
by Lebowski
Aug 12 2011 3:39pm
Forum: Motor Technology
Topic: Not simple BLDC controller It RUNS! :)
Replies: 574
Views: 52251

Re: Not simple BLDC controller

Well my setup is for a lame little girly bike :oops: 'cause the cops here in switzerland are not the little girlies they have in the USA :D so I want to keep stuff legal. But things like engine power and what voltage / current you want to run only depends on your output stage, not on the algorithm r...
by Lebowski
Aug 12 2011 11:42am
Forum: Motor Technology
Topic: Not simple BLDC controller It RUNS! :)
Replies: 574
Views: 52251

Re: Not simple BLDC controller

well if the budget is $150 then make it simple and get: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en537020 though programming will not be simple :? as it will be like taking your first swimming lesson in the middle of the Pacific.... very interesting: the a...
by Lebowski
Aug 12 2011 11:17am
Forum: Motor Technology
Topic: Simple BLDC controller
Replies: 407
Views: 56708

Re: Simple BLDC controller

if you really want to program PIC's on the cheap, google for parallel port PIC programmer.

Most of this stuff is old though (for one I don't have a parallel port anymore) and probably won't support your 18F2431
by Lebowski
Aug 12 2011 10:56am
Forum: Motor Technology
Topic: Simple BLDC controller
Replies: 407
Views: 56708

Re: Simple BLDC controller

Take a look at arduino too, it's cheap, and although it doesn't have any special hardware to deal with tri-phase motors but it has a simple C/C++ library and you'll find lots and lots of code and community support. Whats the chances we could use the arduino programing for the PIC18F2431? Trust me, ...
by Lebowski
Aug 12 2011 4:19am
Forum: Motor Technology
Topic: Need help in driving brushless C6374 KV170
Replies: 19
Views: 1474

Re: Need help in driving brushless C6374 KV170

With a Kv of 170 you will get 3824 rpm. Thank you! So, if I want to get 1000 RPM I need to make about 1:4 belt reduction drive. One thing than I worry about is belt speed. I read a book about belt reduction drives, and there was said that typical belt speed does not exceed dozens of m/s. But I'm no...
by Lebowski
Aug 12 2011 3:25am
Forum: Motor Technology
Topic: Need help in driving brushless C6374 KV170
Replies: 19
Views: 1474

Re: Need help in driving brushless C6374 KV170

Typicalle engine speed depends on the Kv and the effective motor voltage. The effective motor voltage is the power supply (battery) voltage minus the current times the motor resistance. At 600 W / 24 V your current will be 25 Amps. With the specified motor resistance of 56 mOhm your effective voltag...
by Lebowski
Aug 12 2011 2:22am
Forum: E-Bike Non-hub Motor Drives
Topic: Nuvinci developer kits for cheap
Replies: 501
Views: 55486

Re: Nuvinci developer kits for cheap

amberwolf wrote:But it won't likely be $150, either. :lol:
yeah but with the smaller actuater it's going to be lighter and cost less to ship :D
by Lebowski
Aug 12 2011 1:54am
Forum: E-Bike Non-hub Motor Drives
Topic: Nuvinci developer kits for cheap
Replies: 501
Views: 55486

Re: Nuvinci developer kits for cheap

I just got word that probably around the middle of next year a similar kit will be available for the N360 :D
Since this is an easier-shifing hub the shift-actuator is going to be a lot smaller
by Lebowski
Aug 12 2011 1:38am
Forum: Motor Technology
Topic: Simple BLDC controller
Replies: 407
Views: 56708

Re: Simple BLDC controller

LOL nope. I played around a bit with code for my megasquirt2 a couple years ago. But now its time to do the real lerning. I will read and download that all in the morning. I don't have a programer yet but.... Can we build it too? I maybe in over my head but I always find my way to the top. I am don...
by Lebowski
Aug 12 2011 1:08am
Forum: Motor Technology
Topic: Simple BLDC controller
Replies: 407
Views: 56708

Re: Simple BLDC controller

OK so who wants to hold my hand and help me through the steps of programing the PIC18F2431 I will have it soon and I think I have everything on order I should need. So now is the time for me to read about programing and writing code. One of the reasons I got into this ebike building stuff is that I...
by Lebowski
Aug 11 2011 6:55am
Forum: E-Bike General Discussion
Topic: Pretend gas was gone tomorrow -
Replies: 28
Views: 1119

Re: Pretend gas was gone tomorrow -

let's see, I would build what comes down to the Bosch ebike system. So basically a crank motor (because of best efficiency under all conditions), pedal assist only (so not a full on motorbike, I really love the 'superman' feeling a pedal assist give). Battery, probably NiMH as lifetime is much longe...
by Lebowski
Aug 11 2011 2:42am
Forum: E-Bike Non-hub Motor Drives
Topic: Nuvinci developer kits for cheap
Replies: 501
Views: 55486

Re: Nuvinci developer kits for cheap

I contacted Fallbrook about shipping cost for one of these kits to Europe...
$150 shipping costs ! Rediculous ! This would basically double the price to $300 and
then I haven't counted the import tax etc yet.

No way I'm paying this much... pity :( :( :( :cry:
by Lebowski
Aug 10 2011 3:06pm
Forum: Motor Technology
Topic: 2-phase motor / controller idea any good?
Replies: 8
Views: 889

Re: 2-phase motor / controller idea any good?

I'm thinking about a 4-pole 2 windings 90 degrees out of phase design, so the 4-phase you're talking about.. bit of confusion
about nr of connections versus nr of coil, sorry 'bout that
by Lebowski
Aug 10 2011 10:38am
Forum: Motor Technology
Topic: 2-phase motor / controller idea any good?
Replies: 8
Views: 889

2-phase motor / controller idea any good?

I've been wondering about a new motor/controller idea I have... Most (all?) of our BLDC motors are 3 phase motors. 3-phase is used in the mains power distribution network because you don't need a return wire for the ground, in essence the currents in the 3 phases cancel each other out such that no c...
by Lebowski
Aug 10 2011 7:46am
Forum: E-Bike General Discussion
Topic: perspex plastic vs ping battery ?
Replies: 13
Views: 1258

Re: perspex plastic vs ping battery ?

maybe it's easier to use Acryllic glass ? It has a high melting temp (190C, 375F) and is easier to saw / drill than perspex.
by Lebowski
Aug 08 2011 8:45am
Forum: Motor Technology
Topic: Re-wind of a turnigy 80/100 (Now-tutorial w/Video)
Replies: 421
Views: 73932

Re: Re-wind of a turnigy 80/100 (Now-tutorial w/Video)

Hello! I'm a first time poster here but have been reading this forum for quite a while now (and specially the non-hub and motor technology sub-fora) I was wondering if anyone had tried rewinding a turnigy with copper foil instead of wire. Something like 0.1mm thick and as close to 16mm wide as poss...
by Lebowski
Aug 04 2011 2:07am
Forum: Motor Technology
Topic: Inductance What is it what does it do? Collosus has 8uH!
Replies: 308
Views: 25856

Re: Inductance What is it what does it do? Collosus has 8uH!

IN fact I tell you what I will wind it in such a way that I test the same lengh of wire with 3 turns with one and two strands.... So I will still have the two peices of wire hooked to the meter with one set of turns or 2 parallel sets of turns. What I would do is make two measurements, both with th...