Search found 512 matches

by Emoto
Apr 28 2019 10:19am
Forum: Stand-up E-scooters and E-skateboards
Topic: Winter Project... Design and Build an eScooter
Replies: 27
Views: 1134

Re: Winter Project... Design and Build an eScooter

Nice scooter Roncat
That qs hub should be more than enough torque , what is the magnet width 35/40mm ?
If so cant see any reason why you couldnt give it 8kw burst :D .
Look forward to your first ride impressions
by Emoto
Apr 28 2019 10:02am
Forum: Stand-up E-scooters and E-skateboards
Topic: Scootabot
Replies: 36
Views: 3636

Re: Scootabot

Here is a shot of my boss bearing idea small compact and dam strong ..no welding needed :) interference fit and secured with 8 m6 countersunk stainless steel socket head cap screws, removable to service the bearings. More welding art from the guy ive finally found to be the best, after a lot of tria...
by Emoto
Apr 28 2019 9:22am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Yeah DEHiCKA
Lets see if the Qs redesign in the future for a better pathway
by Emoto
Apr 15 2019 8:46am
Forum: Stand-up E-scooters and E-skateboards
Topic: Scootabot
Replies: 36
Views: 3636

Re: Scootabot

The life challenges i spoke of before where i had to go to hospital for a procedure as the wanted to have a good look at me... i had to wait 7 months,But results where ALLLL GOOD :mrgreen: . So im in a much better frame of mind to move forward on this scooter. Might take a step back on motor size as...
by Emoto
Feb 13 2019 8:38am
Forum: Stand-up E-scooters and E-skateboards
Topic: Scootabot
Replies: 36
Views: 3636

Re: Scootabot

Life is throwing its challenges at me atm like never before... and slowing the build add to that Chinese new year , but that's not going to stop me right!! So a while back the engineer drilled the fork pivot of center well thats fixed now with a brass bush, and alloy front wheel spacer done. All nic...
by Emoto
Jan 30 2019 8:10am
Forum: Stand-up E-scooters and E-skateboards
Topic: Scootabot
Replies: 36
Views: 3636

Re: Scootabot

Pyon if you mean motor im still working out details with motor suppler so ill post link when i get it, that way ill know if he's worth sharing or not . And yeah its a 8 inch rim. So far he has been the best with details, some suppliers cant even answer questions , its been 2 weeks of emailing to nar...
by Emoto
Jan 29 2019 10:24am
Forum: Stand-up E-scooters and E-skateboards
Topic: Scootabot
Replies: 36
Views: 3636

Re: Scootabot

Hi Emoto, have you decided on your hub wheel yet? I was looking into hub wheel but could not find a decent ATV tyre to match it on 14/15inch (tyre size), so i gave up and went for 6" Kart wheels instead. Looking forward the rest of your build progressing :) YES finally decided on motor will post to...
by Emoto
Jan 29 2019 9:46am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10kW stand-up scooter with air suspension
Replies: 160
Views: 9711

Re: 5200W stand-up scooter with air suspension

So im wondering what was that magic figure :) final frame only weight including handle bar clamp and downtube , without shocks
by Emoto
Jan 24 2019 8:33am
Forum: Items for Sale - Used
Topic: Revolectrix Cellpro PowerLab 8 v2 1344W Charger
Replies: 10
Views: 1009

Re: Revolectrix Cellpro PowerLab 8 v2 1344W Charger

So... 225 + free aus registered shipping extended indefinitely
by Emoto
Jan 22 2019 8:32am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Well the last two post's say it all for me atm , as relying on this qs motor for the extra kv i needed is a bit of a gamble. Add to that a more specific controller than your average foc is two much of a gamble for now, if i had close to kv needed id go for it, Heading in another direction now. Thank...
by Emoto
Jan 08 2019 9:32am
Forum: Stand-up E-scooters and E-skateboards
Topic: Scootabot
Replies: 36
Views: 3636

Re: Scootabot

So here is a thing im contemplating atm i love the simplicity of a hub / silence / freewheeling ability, and ive found a big one 9/10kg has a 8 x 8'' rim. the magnet width is 60mm not that big but still trying to get specs on stator diameter. im hoping that weight is windings ect. This could have gr...
by Emoto
Jan 06 2019 3:56am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

[quote= If the rotor iron is well designed for leveraging reluctance torque, this will have a ~neutral efficiency impact to use the additional torque. Coming up with that amount you want to deviate from in phase requires a lookup table from characterizing the rotors iron characteristics. Also, take...
by Emoto
Jan 03 2019 8:04am
Forum: Stand-up E-scooters and E-skateboards
Topic: Biggest Power SU Scooter hub motor in 6'' rim
Replies: 1
Views: 236

Biggest Power SU Scooter hub motor in 6'' rim

This is for standup Scooter hub motor in 6'' rim , these are the biggest KW Motors i could find , but mabee you know better please share. The dualtron motor isnt in a 6'' rim afaik but the most powerfull afaik and i saw a Russian utube vid that measured magnet width at 70mm :) im guessing the first ...
by Emoto
Jan 02 2019 8:30am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10kW stand-up scooter with air suspension
Replies: 160
Views: 9711

Re: 5200W stand-up scooter with air suspension

Happy new year! Thank, u 2 =) I want to try setting 120A battery\200A phase. Want to try to accelerate to 60kmh in 4 seconds. As it happens, I will share my impressions and it will be clear whether it is necessary to kicked up rear section to deck =) That 0-50 is already good for that 60mm motor. B...
by Emoto
Jan 01 2019 8:26am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

The flux path i was discussing there was the one from the V grove rotor not the qs3000w u posted up front. For the qs3000w u are right there is not much reluctance torque possible, it will only come by the magnets saturating the stator iron (5-10% max). The pictured rotor with the V-groove magnets ...
by Emoto
Dec 31 2018 1:15pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10kW stand-up scooter with air suspension
Replies: 160
Views: 9711

Re: Stand-up scooter "VOSTOK 1"

[quote=alex_2d In the last video max batt - 55A (4160 watts), phase amps - 110. In this mode, the motor is heated to 110 degrees for 15 minutes. Continuous load without overheating - 30A batt (2200w) [/quote] :bolt: Happy new year! :bolt: Is this still the max performance, im still deciding on motor...
by Emoto
Dec 30 2018 9:16am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Or with other words if the controller you are using is rated for 72V and you already run a 72V battery, you will not have much room for a gain in RPM. Not so if you would run same 72V controler with only 36V battery voltage, where you could gain twice the RPM safely. Thanks for the abbreviation Mad...
by Emoto
Dec 30 2018 8:16am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Ah ok there is a missunderstanding. What we were talking about getting efficiency in terms of using all available Torque. Liveforphsics is refering an operating point past the torque optimum and there the ipm torque is decreasing faster with with increasing FW. I Think he is generalizing , as i am,...
by Emoto
Dec 29 2018 5:29am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Hi Emoto, About the 2-6% gain in eff.: on what basis was this increase calculated? Automotive IPMs normally provide more then 30% of their torque from reluctance. U can even build a motor the just uses reluctance part of the torque and get rid of the magnets and i dont mean those stepper like reluc...
by Emoto
Dec 28 2018 3:24am
Forum: Items for Sale - Used
Topic: Revolectrix Cellpro PowerLab 8 v2 1344W Charger
Replies: 10
Views: 1009

Re: Revolectrix Cellpro PowerLab 8 v2 1344W Charger

No Response from interested partie's so this is still for sale, i think :pancake: , so If Your interested in this charger dont hesitate to pm.
by Emoto
Dec 27 2018 8:47am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 207
Views: 15473

Re: QS 3000w midmotor

Qs specs quote the 2000w motor at just under 8kg.. if any one has one and could weigh it id appreciate it.
by Emoto
Dec 27 2018 8:43am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

tecnologic more home work :) Its funny that a from small question to myself Should i get one of these low 41kv ipm's spawns a lot of research Here is a vid for those interested, bZwLFpXhFbI in the link'' texas instruments'' video they talk about pinching the flux affect , and thats why i assumed it ...
by Emoto
Dec 26 2018 10:16am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 3775

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Hi tecnologic !! So If if i understand , if you dont utilize id / reluctance torque in an ipm that will sort of fight against iq / magnetic torque. making it less efficient. So if we compare it with the 68kv spm at the same speed [kph ] the 41kv ipm would be past its not fluxed state @ 3000 rpm[4500...