Search found 190 matches

by ARod1993
May 25 2020 9:31pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: SilentEnduro conversions
Replies: 48
Views: 7548

Re: SilentEnduro conversions

Thank you for replying, that does answer most of my confusions. For me, it makes it hard to compare motors when their ratings are inaccurate, even if it's for the better. After looking at the Vortex, it seems like somewhat of a hassle to mount a hub motor as a mid drive. The axle has to be very sec...
by ARod1993
May 22 2020 1:19pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: What Strange Build do YOU have Bubbling inside?
Replies: 12
Views: 618

Re: What Strange Build do YOU have Bubbling inside?

My problem is that the things I'm capable of building or fixing are cheap, but rather quickly it's no longer worth the time and money. I still have a few untouched Curries that I can't find a project for that motivates me. If I'd just ordered a few things from QS as I was getting the ideas for them...
by ARod1993
May 20 2020 3:47pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: What Strange Build do YOU have Bubbling inside?
Replies: 12
Views: 618

Re: What Strange Build do YOU have Bubbling inside?

. . . . a lightweight 15-20kW e-moped build bubbling inside for a long time, running a custom FPGA-based controller based on the Arty Z7 for the brain. . . . So when my career went into long term slowdown I was off to community college to learn to do just the sort of thing you're talking about. It ...
by ARod1993
May 20 2020 1:14pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: What Strange Build do YOU have Bubbling inside?
Replies: 12
Views: 618

Re: What Strange Build do YOU have Bubbling inside?

I've basically had a lightweight 15-20kW e-moped build bubbling inside for a long time, running a custom FPGA-based controller based on the Arty Z7 for the brain and a power stage like ZombieSS's driving a Neumotor 8057, with a 28s8p pack of Samsung 30T cells for juice.
by ARod1993
Mar 04 2020 10:22pm
Forum: E-Bike Non-hub Motor Drives
Topic: Rough draft of a MelonDrive
Replies: 6
Views: 840

Re: Rough draft of a MelonDrive

Thanks Its a nice model but since you are asking I see a few obvious areas of concern. Efficiency: Every reduction is another efficiency loss. You have more stuff creating friction and adding weight at every stage. Basically you have to have a really compelling reason to use a small motor and lots o...
by ARod1993
Feb 27 2020 1:11am
Forum: E-Bike Non-hub Motor Drives
Topic: Rough draft of a MelonDrive
Replies: 6
Views: 840

Re: Rough draft of a MelonDrive

Looking good! How do you mount a gear onto the motor? Where do you purchase the gears? Thanks; the gear in this case is a 1/2" shaft while the motor has 12mm, so I figured either a set screw or machining a keyway would do it. The gears, sprockets and shafts are all from McMaster-Carr :) Here are a ...
by ARod1993
Feb 26 2020 9:43pm
Forum: E-Bike Non-hub Motor Drives
Topic: Rough draft of a MelonDrive
Replies: 6
Views: 840

Rough draft of a MelonDrive

Hey guys! I've started messing around with SolidWorks again, and while home sick from work I bashed out a rough draft of a drive unit designed to work with the Turnigy C80100 "melon" motor. It uses two internal jackshafts to achieve a 6:1 reduction internally, and then as of now I have it finishing ...
by ARod1993
Aug 22 2019 9:10pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Starting an iZip I-500 build and have a few questions
Replies: 0
Views: 475

Starting an iZip I-500 build and have a few questions

I just bought a used iZip I-500 from a guy off Craigslist and I'm planning on making something along the lines of MelonScooter out of it. I just measured the battery box and it looks like about 5.25" wide by about 12" long by 3-3.25" tall, so Wolfram Alpha tells me I can just barely fit a 16s7p pack...
by ARod1993
Jul 07 2019 7:28am
Forum: E-Bike Technical
Topic: Torque sensor details
Replies: 1
Views: 272

Torque sensor details

My apologies if this is a super open-ended question, but would any of you guys happen to know what electrical output a typical torque sensor sends on an ebike kit and how that is then read by the controller? I'm asking because I'm looking to build something similar to the Grit Freedom Chair for a fr...
by ARod1993
Sep 05 2015 3:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: Choosing middrive motor, max 200x100mm
Replies: 24
Views: 2360

Re: Choosing middrive motor, max 200x100mm

I don't really know of anything offhand that fits into that performance envelope, but depending on which elements of your wishlist you're willing to compromise on there's at least one option that comes close. The RV120 is a BLDC outrunner, meets your maximum RPM specification (2064 RPM at 48V nomina...
by ARod1993
Jun 16 2015 7:34pm
Forum: Items for Sale - New
Topic: Tangent Motors RC mid drive kit
Replies: 160
Views: 37298

Re: Tangent Motors RC mid drive kit

That's a really nice compact kit you've got there, especially when you consider that powerwise this could probably compete quite nicely with what LightningRods is working on (especially when you're selling drivetrain + motor + controller + Cycle Analyst for $1400; I know L-R's kit is $800 and motor ...
by ARod1993
Jun 06 2015 11:46am
Forum: E-Bike Non-hub Motor Drives
Topic: Revolt Rv-120 pro/ norco aline Video teaser
Replies: 171
Views: 43297

Re: Revolt Rv-120 pro/ norco aline ( rc mid drive) update

Just out of curiosity, at the voltage and current settings that you're running are you having any problems with motor overheating? I'm interested in pairing this motor with a Lebowski controller and wondering what kind of maximum phase current I can run without smoking it.
by ARod1993
May 26 2015 1:41am
Forum: Motor Technology
Topic: Looking for info about Revolt motors
Replies: 130
Views: 23108

Re: Looking for info about Revolt motors

Just out of curiosity, what would people recommend for max continuous phase current and use temperature for these motors? Now that Lebowski supports temperature sensing I'm looking at using thermistors to push the performance envelope as far as I reasonably can without blowing something out or accid...
by ARod1993
May 22 2015 2:39am
Forum: E-Bike Technical
Topic: Non-single pivot suspensions on high-powered mid-drives?
Replies: 8
Views: 964

Re: Non-single pivot suspensions on high-powered mid-drives?

That's really cool, and that's precisely the thing I'm interested in. I'm planning on using scooter/motorcycle chain to a fixed sprocket for the final drive stage, but since I don't know if there are tensioners for those chain sizes that are capable of taking up a significant amount of slack the way...
by ARod1993
May 21 2015 4:15pm
Forum: E-Bike Technical
Topic: Non-single pivot suspensions on high-powered mid-drives?
Replies: 8
Views: 964

Non-single pivot suspensions on high-powered mid-drives?

So now that Specialized's patent on Horst Link/4-bar link designs for rear suspension has expired, it should be feasible for small e-bike manufacturers to design and build frames that use non-single pivot suspension without running afoul of the law. I was wondering whether it would be worth it to fa...
by ARod1993
Apr 21 2015 7:27pm
Forum: E-Bike General Discussion
Topic: Bolt M-1 Electric Moped with pedals
Replies: 42
Views: 7741

Re: Bolt M-1 Moped

Just out of curiosity, it looks like you're using one of the smaller brushless Etek motors for this thing; those are usually good for anywhere from 10-20kW depending on the controller and battery you pair them with. If you don't mind my asking, what voltage and current are you running your system at...
by ARod1993
Feb 06 2015 6:43am
Forum: Motor Technology
Topic: Severe Sevcon faults
Replies: 9
Views: 1178

Re: Severe Sevcon faults

Well, Lebowski I would love to build my own and know a guy who did after struggles with Sevcon, but unfortunately I've never done any kind of programming, software programming or computational integration systems. I'm just a mechanical engineering student thrown in the deep end. :? Building your ow...
by ARod1993
Jan 17 2015 4:36am
Forum: Motor Technology
Topic: Adding Hall Sensors to Induction Motor
Replies: 9
Views: 1308

Re: Adding Hall Sensors to Induction Motor

You should be able to spin up an AC induction motor using a sensorless brushless controller; one of the labs in the power electronics class I took in fall 2013 was to build a simple trapezoidal BLDC controller using a bunch of 7400-series TTL chips for the logic, IR2125 gate drivers, and IRF530 MOSF...
by ARod1993
Dec 27 2014 11:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: Haibike crazy price
Replies: 50
Views: 7139

Re: Haibike crazy price

That is pretty much the going price. Been into a bike shop lately and looked at the price of non motorized full suspension bikes? Many over $5,000. Of course you could go to Wallmart and pick up a full suspension bike for under $200. If you want a Bosch system on a quality bike you have to pay the ...
by ARod1993
Dec 06 2014 8:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: What would the best full suspension bike be (features)?
Replies: 45
Views: 7335

Re: What would the best full suspension bike be (features)?

Hey Guys, Just out of curiosity, I was wondering what your ideal hard edge full suspension bike consist of? (I am talking a high-end bike with a price tag around what a Stealth costs.) This would be a downhill style bike. I do not want to hear "20,000 watts, 200 mile range, and $1,000 price". I wan...
by ARod1993
Dec 05 2014 1:06am
Forum: E-Bike Non-hub Motor Drives
Topic: E-Bike project, cheap as possible with some durability
Replies: 8
Views: 1294

Re: E-Bike project, cheap as possible with some durability

Woops :D I might have overlooked some important info... Heres some more info based on your questions amberwolf : Riding style: Comfortble but I still like to go fast :) Range: Minimum 5 miles (8 km) since its 2,5 miles (4km) back and forth to my school from home, but preforably 10 miles or more of ...
by ARod1993
Nov 25 2014 1:37pm
Forum: E-Bike General Discussion
Topic: Stromer ST1 clone?`
Replies: 4
Views: 666

Re: Stromer ST1 clone?`

I was actually on there looking to get a pedal bike for myself on a BSO budget without getting BSO quality, and all of a sudden I stumbled on a listing for one of these for $650 FOB.
by ARod1993
Nov 25 2014 1:17pm
Forum: E-Bike General Discussion
Topic: Stromer ST1 clone?`
Replies: 4
Views: 666

Re: Stromer ST1 clone?`

Just did; honestly it looks like I found one of the subcontractors who does work for Geoby or Volton, considering that the frame in the AliBaba listing looks remarkably similar to a Geoby IRock 14 or a Volton Alation.
by ARod1993
Nov 25 2014 12:38pm
Forum: E-Bike General Discussion
Topic: Stromer ST1 clone?`
Replies: 4
Views: 666

Stromer ST1 clone?`

So I was screwing around on AliBaba earlier today and stumbled on this listing: http://www.alibaba.com/product-detail/26-inch-250W-or-350-W_60107310010.html?s=p Frame styling looks remarkably similar to that of a Stromer ST1, complete with wide flat downtube that looks like it hosts a removable batt...
by ARod1993
Nov 18 2014 1:32pm
Forum: Motor Technology
Topic: Controller Operation: Trapezoidal, Sinusoidal, FOC
Replies: 2
Views: 476

Re: Controller Operation: Trapezoidal, Sinusoidal, FOC

I have a theory about why you can indeed run some sinewave controllers using just hall sensors; my guess is that those controllers have some sort of interpolation algorithm that lets them roughly infer the position of the motor using the time since the last hall switch and the velocity of the rotor....