Search found 2113 matches

by justin_le
May 29 2019 4:47am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 51
Views: 7681

Re: 2019 Motor Simulator, Mid-drives and other updates

One thing that you do notice from the normalized graph above is that the BBSHD has a slightly higher efficiency. This is because when we look at the motor core losses, the BBS02 has higher motor drag than the BBSHD at the the typical pedal cadence range. BBSxx No Load Losses.jpg They both have simil...
by justin_le
May 29 2019 4:15am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 51
Views: 7681

BBS02 and BBSHD

One of the steps to make this new simulator feature useful was getting the two most popular after market mid-drive systems modeled, namely the Bafang BBS02 and BBSHD drives. At our shop we don't deal much with mid-drives for the reasons outlined here but we were able to receive some sample units fro...
by justin_le
May 29 2019 3:26am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 51
Views: 7681

2019 Motor Simulator, Mid-drives and other updates

Sharp eyes may have noticed that we added a 'mid-drive' option to the online motor simulator last month and have been incrementally flushing out the details. I alluded to this plan earlier here https://endless-sphere.com/forums/viewtopic.php?f=2&t=89877&p=1386574#p1386574 and it's finally live now. ...
by justin_le
May 29 2019 3:03am
Forum: E-Bike General Discussion
Topic: Grin trip simulator core temp
Replies: 10
Views: 768

Re: Grin trip simulator core temp

Thanks amberwolf. I'm thinking that maybe the MAC is being modeled as a direct drive here - Correct conclusion! The trip simulator doesn't currently have any facility for modeling freewheeling motors, it treats it as though the motor is always engaged since that's a much more interesting scenario t...
by justin_le
May 29 2019 2:32am
Forum: E-Bike Build Threads / Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 342
Views: 55593

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

There must be an abundance of data form all those data Loggers. There IS an abundance of data, but just a shortage of time. I has one of our software co-op students working on parsing and organizing much of it (and also fixing/correcting a bunch of corruption that managed to make it into a lot of t...
by justin_le
May 29 2019 2:28am
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 21881

Re: Reference Tests, Tabbed Washers

Can you provide more clarity why the Bafang washer provides advantages? Seems to be that while the tab is further away from the centre of the axle, this advantage is exactly offset by the tab also being further out and producing greater leverage on the dropout arms? If the dropouts were actually sp...
by justin_le
May 28 2019 10:45pm
Forum: E-Bike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 174
Views: 33028

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

It's not, due to the freewheel/clutch. If you want to do regen in a geared motor, you can either buy a clutchless one (such as this ) or weld the clutch fixed in your G310. Actually, while that advice holds with most geared hub motors, it wouldn't be advisable on the G310 because of the helical cut...
by justin_le
Mar 16 2019 12:33am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396735

Re: Definitive Tests on the Heating and Cooling of Hub Motors

Hello, will such a thing work: the wings stretched between the spokes , directly near the hub , directed along the wheel ,deflecting air flow to the hub ? I would say in generally no. The air flow you get from the forwards velocity of the bike is much higher than the rotational component from the w...
by justin_le
Mar 16 2019 12:24am
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 21881

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Well,....It may be that the screws just aren't tight enough. Quite probably. Luckily for us the plate design has 12 threaded hole locations in it, so we were able to rotate the arm by 30 degrees so that the 6 arm holes now line up with the unused 6 threaded plate holes, and this let us tighten them...
by justin_le
Mar 15 2019 8:00am
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 21881

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

I wonder if the flat head taper causes the fastener to stretch and loosen given the back and forth torque creates a wedge lever. Yeah, I think there's a high chance that the countersink wasn't helping things at all and me and Robbie had talked about this. Unfortunately the design requires a flush m...
by justin_le
Mar 14 2019 8:00pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 21881

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Damn this cycle testing is taking its toll on things. We started having hiccups on the station just a few days after re-tightening the arm/plate screws with loctite, and noticed that all but two of the M3 bolts holding the motor housing to the lever arm that goes to the damper had sheared off! We us...
by justin_le
Feb 26 2019 4:19pm
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 2639

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

I'd like to see some more halbach array motors. Yes, they are more expensive because they are more complex to put together, but they are much lighter because you don't need a metal armature core, thus no laminations. So you could have very, very, light rotors. The weight would be mostly from the wi...
by justin_le
Feb 25 2019 8:07am
Forum: Stand-up E-scooters and E-skateboards
Topic: Grin's weight sensing electric longboards #4 and 5, and kit!
Replies: 27
Views: 6577

Re: Grin's weight sensing electric longboards #4 and 5, and kit!

Now you've got me really excited! I'd definitely be interested in what you can develop with this concept… In the end I didn't get the torsion tail since it means I can't install the avenue suspension trucks but would have to install strain gauges on the torsion tail piece. So I picked up the the sm...
by justin_le
Feb 25 2019 7:35am
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 2639

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

Hey cool and thanks for sharing that. This is a refreshing break from all "new battery" breakthroughs we're used to hearing about. There are several other aspects of the EV drivetrain that are all deserving of improvements and it's good to see permanent magnets getting some R&D love too! NP! what i...
by justin_le
Feb 25 2019 7:24am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1239
Views: 249818

Phaserunner Thermal Rollback Characterization in Wind Tunnel

Do post the results of this. I'm not sure when I'll get time to do the promised wind tunnel thermal dissipation tests so any data points here will be appreciated. It turns out the time came to pass in December 2018! Phaserunner in Wind Tunnel.jpg The setup was a fun. You can see the phaserunner zip...
by justin_le
Feb 25 2019 6:26am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1239
Views: 249818

Re: Compact Field Oriented Controller, ASI + Grin, limited run

What is the max current of the 5V line, the Phaserunner can safely provide at up to 90V? I will try to get a proper empirical answer to this soon, but suffice to say it's well above what any normal set of ebike accessories (PAS sensors, brake cutoffs, throttles etc) would draw. The 5V output is com...
by justin_le
Feb 14 2019 6:52pm
Forum: Electric Watercraft
Topic: Electric fishing canoe
Replies: 11
Views: 2671

Re: Electric fishing canoe

wow, amazing reduction in consumption. I'll conduct the experiment if you are kind enough to supply the gear - thanks ol'mate. OK glad to hear that you're game. Send me an email (info @ ebikes.ca) and we'll sort the details from there since I think this is firsthand info that would be of great inte...
by justin_le
Feb 14 2019 5:30am
Forum: Electric Watercraft
Topic: Electric fishing canoe
Replies: 11
Views: 2671

Re: Electric fishing canoe

I'll steal a CA off one of my bikes and test it next time I'm on the water. Sweet. Actually if you do that I'll be willing to donate to you a GPS analogger device so that we can log the actual consumption usage along with the GPS speed and position and such. Then so long as you're out in bodies of ...
by justin_le
Feb 14 2019 5:20am
Forum: Motor Technology
Topic: Optimal Hub Motor design? Break down of BionX D-Series
Replies: 97
Views: 20327

Re: Optimal Hub Motor design? Break down of BionX D-Series

It should still be any hot rodder's dream, If only they didn't use a permanent glue to seal the damn things shut! Is it glue, or ultrasonic welding? (probably doesn't matter) Well whatever it is it's a real PITA to separate the two halves apart in a way that it can be neatly put back together again...
by justin_le
Feb 14 2019 1:10am
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 2639

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

Hey cool and thanks for sharing that. This is a refreshing break from all "new battery" breakthroughs we're used to hearing about. There are several other aspects of the EV drivetrain that are all deserving of improvements and it's good to see permanent magnets getting some R&D love too!
by justin_le
Feb 14 2019 1:01am
Forum: Stand-up E-scooters and E-skateboards
Topic: Grin's weight sensing electric longboards #4 and 5, and kit!
Replies: 27
Views: 6577

Re: Grin's weight sensing electric longboards #4 and 5, and kit!

I love your concept and have been following it's development for many years. My dream board would be the skateboard equivalent of a pedelec - an electric assisted LDP setup. Check out http://pavedwave.org for the theory behind LDP. Mark at http://www.gbomblongboards.com has been hard at work over t...
by justin_le
Feb 14 2019 12:54am
Forum: Electric Watercraft
Topic: Electric fishing canoe
Replies: 11
Views: 2671

Re: Electric fishing canoe

I sure like the looks of this! Any mods done on the outboard motor (either with the prop or the motor controller) or is it complete stock? I'm also curious if you have a watt meter or amp-hour meter to get an idea of your consumption in Wh/km at different cruising speeds. We have lots of firsthand i...
by justin_le
Feb 13 2019 1:59pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 21881

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Just like the first iteration torque arm of the Rohloff hub! https://fernandoj.files.wordpress.com/2013/05/rohloffspeedbone.jpg Ha awesome, thanks for sharing that. Nice design convergence and it looks like the Germans take no chances on their torque arms either! I guess that a person standing and ...
by justin_le
Feb 13 2019 1:43pm
Forum: E-Bike Reviews & Testing
Topic: Cycle Analyst V3 preview and first beta release
Replies: 4561
Views: 818935

Re: Cycle Analyst V3 preview and first beta release

It's worth noting that the shunt resistance is explained in some detail in section 6.13 of the user manual https://www.ebikes.ca/documents/CycleAnalyst_V31_Web.pdf CA Shunt Explain.jpg A 300A 50mV (ie 0.1666 mOhm) shunt is really something I would only use in a vehicle that has 500A or so max draw m...
by justin_le
Feb 13 2019 12:47am
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 21881

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

I'm going to guess the aluminum rear triangle fatigues at the HAZ next to a weld and grows a crack until it can deform enough to trip the limit switches. Ha, not a bad theory but so far the aluminum frame appears to be holding fine. I will say that if the FRAME fails structurally before the torque ...