Search found 1861 matches

by rkosiorek
Jan 28, 2014 11:58 am
Forum: E-Bike Non-hub Motor Drives
Topic: Nuvinci developer kits for cheap
Replies: 501
Views: 47814

Re: Nuvinci developer kits for cheap

wow, they took down the link from their website. not only that but, their support forum is also down. all that's left is a splash screen telling you to email support. I should have a copy of it here somewhere. i'll post back as soon as i find it. first i have to find a flash light. i know it's here ...
by rkosiorek
Jan 03, 2014 7:28 pm
Forum: E-Bike General Discussion
Topic: Heavy Rain Malfunction
Replies: 19
Views: 1240

Re: Heavy Rain Malfunction

a generous dollop of dielectric grease or even regular Vaseline on the bit of exposed leads does wonders to keep water out of the hall sensors. it is also great for sealing connectors.

it may be a little messy but once it is sealed away it does not matter.

rick
by rkosiorek
Oct 07, 2013 12:41 pm
Forum: E-Bike Technical
Topic: Bottom bracket Torque sensor
Replies: 2
Views: 468

Re: Bottom bracket Torque sensor

ebikes.ca sells the THUN brand BB torque sensor.

rick
by rkosiorek
Oct 03, 2013 7:03 pm
Forum: E-Bike Technical
Topic: Different purpose for motor
Replies: 6
Views: 465

Re: Different purpose for motor

mechanically it is always engaged. but electrically the power can be turned on and off. switched off, there is very little drag. but when switched on the dynamo is doing work so it needs energy put in. the higher the electrical load, the higher the mechanical load as well. with a small alternator/dy...
by rkosiorek
Oct 03, 2013 11:51 am
Forum: E-Bike Technical
Topic: Different purpose for motor
Replies: 6
Views: 465

Re: Different purpose for motor

to really impress with techie mumbo jumbo, how about proposing a dynamo that uses eddy currents at the rim an has absolutely no physical contact with the wheel. Magnic produces such a light. http://www.magniclight.com/MagnicLight/index.php/en/startseite this video may be in German but it does explai...
by rkosiorek
Oct 02, 2013 6:41 pm
Forum: E-Bike Technical
Topic: Different purpose for motor
Replies: 6
Views: 465

Re: Different purpose for motor

sure you can use a motor to do that. but it is a huge energy waste using a large motor to do the work a small bicycle hub dynamo can do. Shimano and SRAM both make ones that output 6V AC @1.5W. pedaling a 300W or larger motor takes a lot more effort than a 1.5W dynamo. even without a load the 300W m...
by rkosiorek
Aug 09, 2013 11:21 am
Forum: Battery Technology
Topic: DIY Single Cell LiFePO4 Charger
Replies: 16
Views: 5025

Re: DIY Single Cell LiFePO4 Charger

It's over a year since anyone commented on this charger but the following point may be worthwhile. LiFEPO4 cells do not tolerate being floated at maximum charging voltage for long periods. If a charger "floats" cells and they are left in the charger in this mode for long periods it will substantial...
by rkosiorek
Jul 07, 2013 11:23 pm
Forum: General Discussion
Topic: If you're not into fast street cars, just skip this thread.
Replies: 57
Views: 6035

Re: If you're not into fast street cars, just skip this thre

Anyone here road race? Trackdays,nasa, scca? Anyone who thinks a 60mph ebike is fast should come for a 200mph ride in a street car. I don't have the skills to drive a car at those speeds. But i did find a solution. In Germany there is is thing called a "Nurburgring Taxi" this is a copilot experienc...
by rkosiorek
Jun 05, 2013 6:54 am
Forum: E-Vehicles General Discussion
Topic: Steering multiple controllers. Help!
Replies: 22
Views: 900

Re: Steering multiple controllers. Help!

4QD manufactures a multi throttle, multi controller interface board that buffers the pots. it is usually used to interface a joystick to a pair of controllers. but it can be configured to use a steer pot with a master throttle. in that configuration the steer pot will change the power to each wheel ...
by rkosiorek
May 25, 2013 7:31 pm
Forum: E-Bike Technical
Topic: Build your own CD battery tab welder for about $100.00+-
Replies: 987
Views: 173890

Re:

What about just charging a capacitor bank to the desired voltage, then disconnecting the charging supply. Fire the caps through a SCR and let the caps drain completely Yeah, that's one of my less than elegant solutions. I thought of using two foot switches, one to power the charger... Or maybe rig ...
by rkosiorek
Mar 18, 2013 2:12 pm
Forum: Motor Technology
Topic: Building a triple stator axial flux motor
Replies: 192
Views: 31385

Re: Building a triple stator axial flux motor

Really, REALLY, KEWL!!!

now just so I can be an unappreciative bastard.. How soon before you test it on a bike? The suspense is killing me.

but really that is an impressive display of what can be built with skilled hands and a few simple tools. excellent craftsmanship.

rick
by rkosiorek
Feb 20, 2013 12:07 pm
Forum: E-Bike Technical
Topic: fixing a Daymak Gatto and mods
Replies: 15
Views: 2159

Re: fixing a Daymak Gatto and mods

picture of the wire and diode? SAM_3914tn_.JPG I had a 48v 20a scooter in China that I liked, the controler was 32A, I picked up 2 Gattos with a new set of batteries for $300, I'll keep the batteries and I can buy a new controller or what ever I need. I see the contoller is 17A thanks for replies, ...
by rkosiorek
Feb 19, 2013 1:33 pm
Forum: E-Bike Technical
Topic: fixing a Daymak Gatto and mods
Replies: 15
Views: 2159

Re: fixing a Daymak Gatto and mods

If you haven't guessed already i really dislike these scooters calling themselves ebikes style contraptions. mostly because it confuses people as to what an ebike is. locally there is talk about banning ebikes on the bike paths because of the buffoons ridding these scooter on bike paths creating all...
by rkosiorek
Feb 19, 2013 12:09 pm
Forum: E-Bike Technical
Topic: fixing a Daymak Gatto and mods
Replies: 15
Views: 2159

Re: fixing a Daymak Gatto and mods

Firstly, that is not an eBike. it is an electric scooter. period. face it those pedals are purely decorative. do you even have them attached? or do you ride without. add to the the weight of the thing and you have an underpowered scooter. a hub motor does not have any advantage over a geared motor. ...
by rkosiorek
Feb 07, 2013 11:33 pm
Forum: General Discussion
Topic: non E-bike schematic mod help required
Replies: 13
Views: 477

Re: non E-bike schematic mod help required

i skimmed right over that part about 9V dropping out. so you are probably correct that using 9V at the battery input should work with the resistor changes you calculated. with those values the cutoff should be at a battery voltage of around 5.85V. but to be on the safe side you could temporarily dis...
by rkosiorek
Feb 07, 2013 2:56 pm
Forum: General Discussion
Topic: Converting an SX2 Mini Mill to CNC - build thread
Replies: 26
Views: 35713

Re: Converting an SX2 Mini Mill to CNC - build thread

weight means something but mass means much more. these are open loop stepper motors. there is no feedback mechanism or feedback loop to continuously adjust or correct any deviation from expected behavior or motion. the stepper motor is commanded to move but there is no guarantee that the table or he...
by rkosiorek
Feb 07, 2013 1:10 pm
Forum: General Discussion
Topic: Converting an SX2 Mini Mill to CNC - build thread
Replies: 26
Views: 35713

Re: Converting an SX2 Mini Mill to CNC - build thread

nice job. be interesting to see if there are any issues driving the "Z" axis. gravity helps the head going down and opposes the head going up. that means that the acceleration during "Z" axis contouring will be different depending on whether you are plunging or withdrawing the tool. that could affec...
by rkosiorek
Jan 27, 2013 10:28 pm
Forum: E-Bike Technical
Topic: Width for BMX rims with scooter tires?
Replies: 1
Views: 180

Re: Width for BMX rims with scooter tires?

general rule of thumb. rim should be 2/3rds width of tire or more.

rick
by rkosiorek
Jan 27, 2013 10:25 pm
Forum: E-Bike General Discussion
Topic: Hidden Brake Sensor Pin Out
Replies: 5
Views: 264

Re: Hidden Brake Sensor Pin Out

big discussion on this in the technical reference section. look for something about using reed switched for brakes. explains all.

rick
by rkosiorek
Jan 27, 2013 10:01 pm
Forum: General Discussion
Topic: non E-bike schematic mod help required
Replies: 13
Views: 477

Re: non E-bike schematic mod help required

the way i see it the LT1176 is used as a buck converter to guarantee 6V going into the MAX761. the Max761 is a boost type converter to step up the 6V input to the 12V required by the rest of the circuit. just plug your 9V battery into the input jack used for vehicle power. you don't need to change a...
by rkosiorek
Jan 24, 2013 12:58 am
Forum: E-Vehicles General Discussion
Topic: Hall effect sensor in throttle.
Replies: 5
Views: 1254

Re: Hall effect sensor in throttle.

no, you cannot use the same sensors inside of a motor. in a motor the sensor latches and is either a logic "0" or logic "1" and toggles between 0V and 5V. often the problem inside of the throttle is that the magnet comes loose and it no longer moves when the throttle is twisted. i'd pop the throttle...
by rkosiorek
Jan 12, 2013 1:43 pm
Forum: General Discussion
Topic: Any USA expatriates here?
Replies: 124
Views: 4892

Re: Any USA expatriates here?

wow, that site has some very scary statistics. according to them you yanks are 3X as likely to die by violence as the next closest competitor . and 9X for war. only 17 civilized countries are being compared here. no third world nations are listed. and it seems that the US leads or is close to the to...
by rkosiorek
Jan 03, 2013 1:03 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Cyclone controller died
Replies: 13
Views: 580

Re: Cyclone controller died

I'm tempted to scold you severely and swear up and down that no one else here has never, ever committed such an error. most especially not ME! good thing the internet is so anonymous. that means you can't actually see me trying to say that with a straight face. i usually console myself by saying tha...
by rkosiorek
Jan 03, 2013 12:50 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Nuvinci developer kits for cheap
Replies: 501
Views: 47814

Re: Nuvinci developer kits for cheap

How about a fitting which goes over the shaft, with 2 cables? kinda like the manual shifter, but connected to the shift motor? Would mean no extra turns, and no twist up. Would there be anything out there which can be adapted to this? i would think that it would not be too difficult to adapt the re...