Search found 138 matches

by stan.distortion
Mar 31 2020 4:46am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1017
Views: 86576

Re: APL's DIY axial-flux motor

Yeah, toothed stators are usually used on stepper motors along with a toothed rotor to gain stall (holding) torque, usually at the cost of rpm.
by stan.distortion
Mar 27 2020 9:17am
Forum: E-Scooter and Motorcycle General Discussion
Topic: New conversion project for Piaggio Zip 50
Replies: 16
Views: 1576

Re: New conversion project for Piaggio Zip 50

Have you checked the swinging arm kits from QS? It looks like you'd need a lot of engineered parts to mount the 138 70H on your existing swinging arm. http://www.cnqsmotor.com/en/article_read/QSMOTOR%203000W%205000W%20138%2070H%20electric%20motorbike%20mid%20drive%20motor%20for%20electric%20motorcyc...
by stan.distortion
Mar 19 2020 5:58am
Forum: E-Vehicles General Discussion
Topic: Regen controller for E-Start on ICE
Replies: 5
Views: 258

Re: Regen controller for E-Start on ICE

A starter from a similar model would be by far the simplest option, even if none are available a flywheel to match the crankshaft taper with the gear/sprocket and sprag clutch should be possible as manufacturers tend to use the same taper across the range. Failing that it's possible to use the flywh...
by stan.distortion
Mar 15 2020 7:17am
Forum: General Discussion
Topic: Bitcoins
Replies: 255
Views: 41778

Re: Bitcoins

The Crypto coins have massively dropped over the last few days, ironically they are touted as the safe haven, but traditional gold has done far better only dropping single digit %, while major cryptos lost around 50% over the last week. I am not really a crypto coin enthusiast, the only thing I am ...
by stan.distortion
Mar 12 2020 6:29am
Forum: E-Bike Build Threads / Photos & Video
Topic: Death Trike (Its Vintage!)
Replies: 11
Views: 1403

Re: Death Trike (Its Vintage!)

goatman wrote:
Feb 21 2020 11:00pm
a person gets hammered, builds a 3000watt death trike with no brakes. makes one post, then???
never to be heard from again.
Send that man more beer! ;)
by stan.distortion
Mar 10 2020 3:52pm
Forum: General Discussion
Topic: Need help with 80v Greenworks/Kobalt/Stiga chainsaw speed controller
Replies: 15
Views: 519

Re: Need help with 80v Greenworks/Kobalt/Stiga chainsaw speed controller

Thanks for the pic, I was hoping it was an electric pump but it looks like most (all?) electric saws are still using mechanical pumps :/ The one I'm planning to use is a ULKA NME, usually found in expresso machines but also used for oil in some applications, voltages might be an issue though. If you...
by stan.distortion
Mar 10 2020 11:06am
Forum: General Discussion
Topic: Need help with 80v Greenworks/Kobalt/Stiga chainsaw speed controller
Replies: 15
Views: 519

Re: Need help with 80v Greenworks/Kobalt/Stiga chainsaw speed controller

Sorry if it's a bit off topic but could you post a pic of the oil pump on that saw? I'm building a saw from the ground up at the mo and have a pump on order that will work but it's quite a big lump, with driver circuitry it will take up about the same space as the motor! Thanks. EDIT: My best guess ...
by stan.distortion
Mar 09 2020 8:52am
Forum: Motor Technology
Topic: Hunstable HET Electric turbine
Replies: 10
Views: 636

Re: Hunstable HET Electric turbine

No, or rather, yes but only the less important bits. Like nearly all motors that one is steel cored and that's the hard part, you could print many of the parts but the cores would still need to be specially cut and that costs $$$. You could use the same kind of arrangement with air core that could b...
by stan.distortion
Mar 04 2020 6:42am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

There are a couple more on hobbyking that are worth a look for a saw: https://hobbyking.com/en_us/1-5th-brushless-motor-780kv.html?queryID=475e0f217853f100b8239d4284fa5746&objectID=45264&indexName=hbk_live_magento_en_us_products_hbk_price_stock_7_group_0_desc https://hobbyking.com/en_us/turnigy-aqua...
by stan.distortion
Mar 03 2020 10:09am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Incremental prototypes would be a great way to get a feel for the technology and which direction to head in. Some 12S lipo packs, a big ~5kW RC motor and a sensorless controller on a smaller saw would be an easy way to dip a toe. Yep, and for pretty much a throwaway budget compared to the costs of ...
by stan.distortion
Mar 03 2020 8:27am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

+1 to vesc, really nice to work with and the new version 7 should be ideal, light, dependable and should just work for many motors that are notoriously difficult to run with other controllers. Your tuner will never go back to infernal combustion after seeing the logging and monitoring capabilities :...
by stan.distortion
Mar 02 2020 4:55pm
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

By the sounds of things power wont be much of a problem and considering the sponsors you'll probably have a far better chance of the organisers looking favourably on an AC setup than DC (the stinky, thirsty but cheap 2-strokes of the electric world). From experience I'd suggest again to start small ...
by stan.distortion
Mar 02 2020 12:10pm
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

You definitely can't go with DC and no controller (just a switch), because the clip I watched had one of the contestants get on the throttle too quickly and snapped the chain before even getting the saw to the log. If there would be a way use a switch only and have the rpm go from 0 to 100% smoothl...
by stan.distortion
Mar 02 2020 9:39am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Yeah, I'd done quite of working-out for air core designs, nothing like as much as the researchers in that article put into minimising iron cores but enough for it to be obvious there's plenty of scope for improving power to weight ratios. I know I keep harping on about DC but the truth is I've littl...
by stan.distortion
Mar 02 2020 8:23am
Forum: Motor Technology
Topic: Lebowski controller IC 2.A1 source code and (short) explanation
Replies: 20
Views: 704

Re: Lebowski controller IC 2.A1 source code and (short) explanation

I can't even begin to appreciate the work that must have gone into all that, thanks! :bigthumb:
by stan.distortion
Mar 02 2020 5:57am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

$5k? I think an AC system will be unlikely to cost less than double that once development costs are accounted for and I wouldn't be one bit surprised if it runs well into 6 figures. An unfortunate fact with motors is the more power you want to get out of them, the heavier they need to be and 10 seco...
by stan.distortion
Mar 02 2020 2:53am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

If you use single stage geared reduction (or step-up) and tweak the weight of the output shaft then torque reaction can be totally cancelled out.
by stan.distortion
Feb 29 2020 11:14am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Battery can be backpack mounted if needed so isn't a constraint or a technical challenge. I think it's a given the system needs to match the two smoke saw's speeds. Electric motors can be over-revved. Iron losses will either become excessive or the rotor will fly apart, but this is drag racing so s...
by stan.distortion
Feb 28 2020 7:45pm
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Nope, DC. Starter motors are series wound, the more it digs in, the more torque it puts out. Over reving will be something to watch out for, series wound will rev it's self to death if you give it enough volts. If it wasn't for that and the sheer kick on strtup then all you would need is a relay to ...
by stan.distortion
Feb 28 2020 12:25pm
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Not sure the starter motor is the way to go long term. Short term, it may be a simpler setup, but I hope for all of us here that some thought gets run into a more wide spread beneficial platform. BTW, I remember a small motor project the shop was working on that designed-used a sub minute run dc mo...
by stan.distortion
Feb 28 2020 10:31am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Hehe, I think I see where this thread is going. Before it goes any further and the horsepower daemon takes over, is Endless Sphere going to get some sponsorship out of this? ;) EDIT: I hadn't really considered DC much but this could be one of the very few applications where starter motors are a good...
by stan.distortion
Feb 28 2020 10:11am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

There is nothing in the Pletenberg range that has the kw and rpm to match the requirements here. Maybe a special fast wind on a Nova, but then yo lose the torque and have to run crazy voltage. As for water cooling :roll: ....get real, this thing is going to run for 10 secs... the water wouldnt have...
by stan.distortion
Feb 28 2020 8:49am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 124
Views: 3351

Re: Electric Racing Chainsaw Build, Help Please

Start small, I've prototyped one for day to day use and it worked out really well but there where a few issues that could have meant a total re-design. Temperature was the main one and if you're looking for peak performance then it's going to be a top priority, getting high power output will be fair...
by stan.distortion
Feb 26 2020 7:41pm
Forum: General Discussion
Topic: Wondering about potential of plywood velomobile
Replies: 25
Views: 1491

Re: Wondering about potential of plywood velomobile

Apparent relatively dense pine is one of the most favoured for aircraft, 12 rings per inch or better.
by stan.distortion
Feb 21 2020 5:17am
Forum: EV Business World
Topic: GM retreating into its shell ?
Replies: 35
Views: 1683

Re: GM retreating into its shell ?

Aren't Holdens considered a national icon in that part of the world, the kind of car that can take a bit of rust without the daylight showing through? Tell your bloody government that GM can do whatever the hell it wants but Australia is keeping Holden. Guinness used to be like that here in Ireland,...