Search found 956 matches

by boostjuice
Nov 25 2014 5:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: E-bike project (RC mid drive system)
Replies: 101
Views: 23134

Re: E-bike project (RC mid drive system)

Absolutely gorgeous... engineering, fit & finish....
by boostjuice
Nov 02 2014 6:57am
Forum: Motor Technology
Topic: Guaging interest in irfp4468 and irfp4568 controllers.
Replies: 4
Views: 965

Re: Guaging interest in irfp4468 and irfp4568 controllers.

I have ordered batches of these before. Best price I could find was here. Not saying you cant find cheaper, but a benchmark to work from. http://component.iiic.cc/index.php?main_page=product_info&products_id=3731668 http://component.iiic.cc/index.php?main_page=product_info&cPath=17_178&products_id=1...
by boostjuice
Sep 16 2014 7:38am
Forum: E-Bike Non-hub Motor Drives
Topic: Internally geared hubs as mid-drive transmissions?
Replies: 8
Views: 2329

Re: Internally geared hubs as mid-drive transmissions?

...also i tried a red band 8speed nexus as the jackshaft with a few kw and it stripped gears (from rpm?) similar to others have found. http://endless-sphere.com/forums/viewtopic.php?f=28&t=52151&start=50#p830123 More good feedback re: the alfine IHG - we have used these for the last 3 years in the ...
by boostjuice
Sep 16 2014 1:27am
Forum: E-Bike Non-hub Motor Drives
Topic: Cyclone Cadence - gear up human speed?
Replies: 30
Views: 16899

Re: Cyclone Cadence - gear up human speed?

Hey Boostjuice I know this is an old thread but I was wondering why you chose the 219 sprocket that you did. It was a composite kevlar rather than aluminium, was this to make it quieter or lighter? Did it wear ok? Cheers Al Yes, quieter (less 'clackity' as the steel chain rollers slide onto the com...
by boostjuice
Sep 03 2014 4:03am
Forum: Battery Technology
Topic: New to soldering A123 LifePo4 packs
Replies: 17
Views: 2274

Re: New to soldering A123 LifePo4 packs

And if the 3.7V nominal didn't give it away, the tabs on opposing ends of the pouch and the lack of insignias guarantees they are not A123 cells either.
by boostjuice
Feb 19 2014 12:56am
Forum: Motor Technology
Topic: Adding snubber caps to 18FET
Replies: 30
Views: 3167

Re: Adding snubber caps to 18FET

'Sketchy Sky' needs to be introduced to the concepts of 'safety factor/headroom' and 'points of diminishing returns on investment'.
by boostjuice
Feb 16 2014 6:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: First Freewheel crank
Replies: 6
Views: 2131

Re: First Freewheel crank

Actually, front freewheel cranks started long before the new millennium. Shimano produced a 'FF system' in the 1970's that theoretically could be used in today's retrofitted e-bike mid-drive kits. Even using manufacturing design/methods from back then, the engineering of these archaic cranksets woul...
by boostjuice
Feb 10 2014 10:04pm
Forum: Motor Technology
Topic: Two Mech Speed Hubmotor
Replies: 5
Views: 809

Re: Two Mech Speed Hubmotor

This chinese toy looks as anaemic as the SRAM spark. Better off just going with a MAC/BMC IMHO.
by boostjuice
Feb 04 2014 7:16pm
Forum: E-Bike Non-hub Motor Drives
Topic: Strong freewheeling crankset
Replies: 340
Views: 63517

Re: Strong freewheeling crankset

Hey Boost...that's a cool and neat work...great. Would be interesting to see how the howitzer adapted splines will work... The HS BB is not known for the reliability of the non-outboard bearings, though.... Hi Jules. I'm confident in the integrity of the fitment of the force broached crank arm spli...
by boostjuice
Feb 04 2014 5:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: cyclone with nylon gears
Replies: 27
Views: 3485

Re: cyclone with nylon gears

I dont suppose you know the reduction needed for a decently close to peddaling cadence Miles ,it would be a bit of guess work for me right now :P You don't know the motor speed? umm no ,lazyness on my part i would asume ,little reserch prob wouldnt go a miss :oops: but i have 2x 1200w cyclones runn...
by boostjuice
Feb 04 2014 1:51am
Forum: E-Bike Non-hub Motor Drives
Topic: Strong freewheeling crankset
Replies: 340
Views: 63517

Indestructable! [well....hopefully] freewheel crankset

So, as I eluded to many posts back in this thread, having not been satisfied with the torque capability of ACS crossfire -and similar- freewheels, I knew that if I wanted a long service-factor pedal-torque reliable freewheel crankset I would have to engineer/fabricate something similar to fullthrott...
by boostjuice
Jan 30 2014 10:11pm
Forum: E-Bike Non-hub Motor Drives
Topic: Headline motor fried?
Replies: 10
Views: 1087

Re: Headline motor fried?

The throttle is most likely fine, so don't replace that before investigating the more likely suspect...the motor controller. The reason the throttle is giving the error signal is that it interrogates the motor controller via a tiny 8-pin PIC MCU, and indicates errors found via the throttle LED's. Th...
by boostjuice
Jan 22 2014 6:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: Active heatsink for cyclone motors. 5000w continuously.
Replies: 15
Views: 6965

Re: Active heatsink for cyclone motors. 5000w continuously.

Read my post attentively. I use the fan of 40 watts. It is superfluous. I reduce fan speed. Now the fan consume 10 watt. Cyclone efficiency at a power 5000w about 75%. Heatsink system needs quickly to lead out heat 750w. Any passive heat sink attached to an external wall of the stator isn't capable...
by boostjuice
Jan 21 2014 6:35pm
Forum: E-Bike Non-hub Motor Drives
Topic: Cyclone 3000W Mountain Bike
Replies: 17
Views: 5595

Re: Cyclone 3000W Mountain Bike

steelefist wrote:Are you happy with the motor?
Search my old posts... I've written about it.
by boostjuice
Jan 19 2014 9:08pm
Forum: E-Bike Non-hub Motor Drives
Topic: Cyclone 3000W Mountain Bike
Replies: 17
Views: 5595

Re: Cyclone 3000W Mountain Bike

Miles wrote:90Kg-cm is 8.8Nm

8.8Nm / 4.8kg gives 1.8Nm/kg

That's a bit more plausible..... :)
Yes that's correct (from personal experience engineering one of these motors to mate with a gearbox).
by boostjuice
Dec 18 2013 10:09pm
Forum: E-Bike Technical
Topic: Are hubmotors going to get lighter?
Replies: 43
Views: 3917

Re: Are hubmotors going to get lighter?

Seems to me that they could be made lighter by using a 2-stage planetary gear reducer with a smaller but higher revving motor. Don't those RC motors make lots of watts with less copper. Absolutely. I think this is the direction ex-China affordable hub motors will go to shave weight compared with cu...
by boostjuice
Dec 17 2013 7:00pm
Forum: E-Bike Technical
Topic: Are hubmotors going to get lighter?
Replies: 43
Views: 3917

Re: Are hubmotors going to get lighter?

As power/weight of electric motors is heavily influenced by the relative magnet/stator-tooth velocity, DD hub motor's are always going to be somewhat handicapped compared with gear reduced systems that have a lot more more scope for weight savings in the reduction systems. The way I see it, is that ...
by boostjuice
Dec 15 2013 1:26am
Forum: Motor Technology
Topic: Adding snubber caps to 18FET
Replies: 30
Views: 3167

Re: Adding snubber caps to 18FET

Edit: I soldered a bunch on them in parallel between the pads that phase wires are connected to and ground (with one cap on the right between + and - battery). Is this correct? Sorry to break it to you after you've soldered everything up, but there should be no caps between the phase terminals and ...
by boostjuice
Dec 13 2013 7:22pm
Forum: E-Bike Non-hub Motor Drives
Topic: backyard millyard....midmount....
Replies: 108
Views: 17080

Re: backyard millyard....midmount....

I'm immensely impressed Tri. You're a true dedicated craftsman with an engineer's mind for innovation. Particularly impressive is the amount of hand built form work you've achieved to such a high fit n' finish. Many beautiful CNC creations have been paraded on ES, but yourself and AussieJester as tw...
by boostjuice
Dec 12 2013 10:44pm
Forum: Motor Technology
Topic: Adding snubber caps to 18FET
Replies: 30
Views: 3167

Re: Adding snubber caps to 18FET

liveforphysics wrote:I didn't see ESL data, has anyone measured it?
Yeah, its a shame they don't list it. I would have measured it if I could have but I don't have the gear to do it.
by boostjuice
Dec 12 2013 9:47pm
Forum: E-Bike Non-hub Motor Drives
Topic: Is Cyclone output shaft easy to remove?
Replies: 3
Views: 482

Re: Is Cyclone output shaft easy to remove?

...It's a prick of a job. I tried myself, even using a big-ass bench vise I couldn't budge it, so I gave up on my ceramic bearing upgrade intentions in this area. Yes, the cir-clip was removed
by boostjuice
Dec 12 2013 6:41pm
Forum: Motor Technology
Topic: Adding snubber caps to 18FET
Replies: 30
Views: 3167

Re: Adding snubber caps to 18FET

Those box shaped caps are Metalized Polypropylene Film (MKP) type which are an excellent choice due to their typically low ESR and higher ripple current capability (relative to other cap types of similar size). Does the datasheet for those ones you've pictured list the ESR and/or ripple current valu...
by boostjuice
Dec 11 2013 7:19pm
Forum: Battery Technology
Topic: Toshiba SCiB 24V 4.2Ah performance
Replies: 13
Views: 3316

Re: Toshiba SCiB 24V 4.2Ah performance

Yeah, I noticed that error and swapped the labels back the right way just before you posted :lol: I'm aware of Battery University's dubious information credibility, but they were the only source I could find of those neat graphs in JPEG form (which they themselves referenced from BCG research's PDF ...