Search found 2323 matches

by madin88
Dec 10, 2017 6:33 am
Forum: E-Bike General Discussion
Topic: Rim stronger than the sunringle MTX39?
Replies: 14
Views: 268

Re: Rim stronger than the sunringle MTX39?

If FluxZoom is going to lace a heavy (10kg+) hub motor into it, all those rims will break sooner or later.
For Middrive the best choice probabaly, but for hub drive i would recommend to use moped rims, spokes and tires with plenty of rubber.
by madin88
Dec 09, 2017 2:37 pm
Forum: E-Bike General Discussion
Topic: Rim stronger than the sunringle MTX39?
Replies: 14
Views: 268

Re: Rim stronger than the sunringle MTX39?

spiros wrote:
Dec 09, 2017 1:47 pm
Don't forget the mavic ex729.
the ex729 looks super strong with those double eylets.
by madin88
Dec 09, 2017 6:16 am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-ron Adaptto
Replies: 9
Views: 498

Re: Sur-ron Adaptto

I asked Allex what he thought about the Adaptto and he says that there hasn't been much success with mid drives. I think that is because most mid drives freewheel. This is a direct drive setup which differs from most mids. If the motor settings can be set up properly for this motor, it should be a ...
by madin88
Dec 09, 2017 5:36 am
Forum: Battery Technology
Topic: Using a MPPT solar charge controller as a bulk charger
Replies: 17
Views: 268

Re: Using a MPPT solar charge controller as a bulk charger

On a day with frequent scudding clouds this wastes a lot of usable charge time. Changing the recovery time constant would be a good thing but it is not programable. Yes thats the main problem. It might be good enough for stationary use, but installed on a vehicle which is moving it would have poor ...
by madin88
Dec 08, 2017 1:37 pm
Forum: Battery Technology
Topic: Using a MPPT solar charge controller as a bulk charger
Replies: 17
Views: 268

Re: Using a MPPT solar charge controller as a bulk charger

"3.55V per cell, which is suitable for most LiFePO4" I don't find an Lion version? The float/CV voltage can be specified by the customer (check specifications the column far right) . As this is a charger and not a BMS, the cell voltage by itself doesn't matter. If you have 14s LiIon battery for ins...
by madin88
Dec 08, 2017 1:06 pm
Forum: Battery Technology
Topic: Using a MPPT solar charge controller as a bulk charger
Replies: 17
Views: 268

Re: Using a MPPT solar charge controller as a bulk charger

Nice controllers for sure, but they are buck controllers and wouldn't be useful charging my Ebike. The MPT-7210A is CC/CV, something I need for my LiPoly. That's bullshit. https://genasun.com/all-products/solar-charge-controllers/for-lithium/gvb-8a-li-lithium-solar-boost-controller/ They have boost...
by madin88
Dec 06, 2017 1:10 pm
Forum: Battery Technology
Topic: Using a MPPT solar charge controller as a bulk charger
Replies: 17
Views: 268

Re: Using a MPPT solar charge controller as a bulk charger

Thanks for posting the boost controller I wasn't aware of them and will be buying one to try out. In reading the reviews it seems that these reset a lot if the input voltage drops so the best way to hook one up would be to use the house battery as the input. I don't own such controller, but a few m...
by madin88
Dec 06, 2017 12:18 pm
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 224
Views: 5894

Re: PowerVelocity controller review

Go back to my first post on this meter. Reread it. I've never changed my tune on what I thought of it or my expectations. there stands "more confirmation" and "hopefully it will work" :roll: Don't get me wrong, i was going to prevent you from buying the wrong device for measuring Rds On of Mosfets....
by madin88
Dec 05, 2017 12:12 pm
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 224
Views: 5894

Re: PowerVelocity controller review

THat ESR meter does measure low resistances. I get that it was designed for measuring internal resistance of caps. I did read the description. So why does that matter specifically? If I put a shunt across it's 2 leads, will it measure the resistance of the shunt? My suspicion is that it will. So th...
by madin88
Dec 04, 2017 2:36 pm
Forum: E-Bike Photos & Video
Topic: Vector Light Commuter Build
Replies: 35
Views: 1698

Re: Vector Light Commuter Build

The geometry looks better now.
I always adjust the geometry so the bike is stable when riding hands-free. The fork angle or rather the trail of the front wheel is important for that.
by madin88
Dec 04, 2017 2:29 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike from China
Replies: 161
Views: 9619

Re: Sur-Ron - New Mid drive Bike from China

fantastic vid^^
It brings a lot of appetence for riding on such tracks :)
by madin88
Dec 03, 2017 11:21 am
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 224
Views: 5894

Re: PowerVelocity controller review

That's an ESR meter. Designed to measure series resistance of capacitors. Seems to have a resolution of 0.001. Not very adequate resolution for measuring a value of 0.0032 vs 0.0035. I told him already that this meter is the wrong device. It should have the 4-wire method and much more resolution. 1...
by madin88
Dec 03, 2017 8:33 am
Forum: Motor Technology
Topic: Motor comparison spreadsheet
Replies: 548
Views: 34914

Re: Motor comparison spreadsheet

toolman2 wrote:
Dec 03, 2017 8:23 am
Just to fill in the gaps:

Joby JM1 0.01 ohms phase to phase.
inductance 21.7uH.
uses around 590w to do 8500rpm.
what was the kV?
by madin88
Dec 03, 2017 7:44 am
Forum: Motor Technology
Topic: Designing of 12F 100kERPM Sensored/Sensorless controller
Replies: 64
Views: 4797

Re: Designing of 12F 100kERPM Sensored/Sensorless controller

xaocvl, thanks for the vids, and welcome to the forum!
by madin88
Dec 03, 2017 6:15 am
Forum: E-Bike Photos & Video
Topic: my workshop burned down and then what happened
Replies: 3
Views: 193

Re: my workshop burned down and then what happened

Was it during charge or in inactive state?
What kind of cells, BMS and manufacturer?

What a mess. My condolences.
by madin88
Dec 03, 2017 5:58 am
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 224
Views: 5894

Re: PowerVelocity controller review

I never mentioned the risk of FETs failing due to inconsistent supply. It's rather consistent and comes form a single supplier. I did mention that there may be just bad mosfets in batches and that's why I warrant controllers against defects. My english is not perfect, but that there may be just bad...
by madin88
Dec 02, 2017 8:03 am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 4757
Views: 336897

Re: Adaptto Mini-E/Max-E Owner's Thread

my problem is, my battery pack is a welded pack :(, it´s not easy remove that group and charge it, and not sure how I can insolate that group and charge it without disassesemble part of the battery... don't think complicated. just use the balance wires of this group or solder new wires to + and - a...
by madin88
Dec 02, 2017 7:17 am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 4757
Views: 336897

Re: Adaptto Mini-E/Max-E Owner's Thread

madin88 : did you finally get the slave master config to work properly ? I have the same damn speed limit problem that you met. I could not sort out the issues so the 2WD unit went to moscow. The Adaptto guys hooked it up on theire test bench, but than they noticed that the 2WD system was never des...
by madin88
Dec 02, 2017 7:03 am
Forum: Motor Technology
Topic: middrive motor, small and powerful -> Neu 8057/75 or??
Replies: 18
Views: 812

Re: middrive motor, small and powerful -> Neu 8057/75 or??

What controller would you run madin88? Tom I would try it with what i have after adding halls, which would be Adaptto Max-E and a Powervelocity 12F. A Kelly KBSX with high speed firmware should work well but it has only speed based throttle. The coming controller from VasiliSk doesn't look bad and ...
by madin88
Dec 02, 2017 7:02 am
Forum: Motor Technology
Topic: Designing of 12F 100kERPM Sensored/Sensorless controller
Replies: 64
Views: 4797

Re: Designing of 12F 100kERPM Sensored/Sensorless controller

Any news and how far is the development of FOC?
by madin88
Dec 02, 2017 6:22 am
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 224
Views: 5894

Re: PowerVelocity controller review

I just want to bring up that powervelocity mentioned that there is the risk that FET's could die because of bad / inconsistent supply of his AOT290. My 12F controller died withoun any reason at only 48V in combination with a 9C hub motor. Even if the method of measuring the FETs from ElectricGod isn...
by madin88
Dec 02, 2017 6:07 am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 4757
Views: 336897

Re: Adaptto Mini-E/Max-E Owner's Thread

nio88 i would charge the group 14 with external charger up to the same voltage as the other groups. if you do it with low current (less than 1A or so) a connection to the balancing wires would be enough. Otherwise solder wires directly to this group and remove them afterwards. If the voltage starts ...
by madin88
Dec 02, 2017 5:59 am
Forum: Motor Technology
Topic: VESC-controller
Replies: 73
Views: 7414

Re: VESC-controller

Fantastic work. This seems to be the first VESC 6 board for really high power applications. I am no expert in controller design so a set with all parts/board needed to assemble a complete controllers would be nice to see. Would it be possible to combine this brain board with a power stage made of mo...
by madin88
Dec 02, 2017 5:55 am
Forum: Motor Technology
Topic: cooler graphene windings in motors?
Replies: 12
Views: 298

Re: cooler graphene windings in motors?

here a pic of a motor wound with nano tube wire: http://www.kkoziol.org/resources/gallery/145/368/motor.jpg From what i found out those carbon nano tubes are only conductive in AXIAL direction. This leads to a lot of problems if you like to add connectors or join the nano tubes with other conductive...