Search found 2638 matches

by madin88
Aug 24 2018 6:53am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

I've received my 8057 and I seem to have the same problem as madin with his original shaft. The fit is quite loose. With the motor bolted to a block of wood and clamped to the desk, the vibration is strong enough at 3000rpm to cause my oscilloscope to slowly wander around the desk. The motor itself...
by madin88
Aug 20 2018 1:58pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

Vasili is also working on a bigger one. Can't remember 24 or 30 FET version. Don't know when that will be ready though. Try asking him for details if you consider Vasili controller. I am already on the list of buyers for the 12F unit as i want to get rid off the Adaptto controller as soon as possib...
by madin88
Aug 20 2018 7:17am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 42
Views: 2513

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

Yep, pretty much. I believe the test was done at 180A. One thing to note though is that it was not the sum of the currents, but the total magnitude, so sqrt(D^2 + Q^2). And yep magic torque increase just for doing this! makes sense. Thanks for the explaination! Sort of- you can use additional D cur...
by madin88
Aug 20 2018 6:39am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

Swapping out the stock shunt for a custom shunt that is liquid cooled should take care of that fluctuating reading? I guess it will be possible to manually set the correct resistance of the shunt in the software so if the new liquid cooled shunt has different reading it will be possible to correct ...
by madin88
Aug 20 2018 5:14am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 275
Views: 21202

Re: Nucular electronics - complete kit for ev!

Will the controller support field weakening (in FOC mode), and if yes, will it be possible to set a flux weaken current in ampere, or will it be some kind of phase shift in degree?

Whats the PWM frequency?
by madin88
Aug 19 2018 9:52am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

I'm surprised that the controller has no way to measure phase current given the price and sophistication of the overall system. Of course they must have some kind of method to take control over the phase currents. From what i know it could be also done via Rds on of the FET's (voltage drop over FET...
by madin88
Aug 19 2018 9:07am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

I blew one midi-E, got it repaired, blew it again in one month.. Don't get much for quality with Adaptto. :wink: Do you know what caused it to blew or in which situation it gave up? In russia board i read somewhere that the driver boards could overheat and make the FET's switching crazy, which woul...
by madin88
Aug 17 2018 6:18am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 42
Views: 2513

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

We did a bit of dyno testing on this motor, sweeping through 30 phase advances to find the optimal torque per amp setpoints at low speeds. This data was used to generate a stall table, and through other methods we were able to get a complete lookup table with acceptable performance. With all the cu...
by madin88
Aug 17 2018 5:13am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2735
Views: 159277

Re: Sur-Ron - New Mid drive Bike

Allex wrote:
Aug 16 2018 3:57pm
We will have our first EU versions end of Sept. here in Sweden.
Which version exactly, and about how much will it cost?
Is it still true that SurRon X will not be shipped outside of china, and is reserved for the domestic market?
by madin88
Aug 14 2018 12:48pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 42
Views: 2513

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

Nice conversion and reuse of apparently great parts from the junkjard. The BMX might be ok for tests, but i would put this drive unit at least on a larger frame with suspension. I think a Q76R frame or a similar one where the motor can be mounted to the swingarm would be a good base :wink: The Kv of...
by madin88
Aug 11 2018 8:41am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

Do you have a link to the controller? https://github.com/TechAUmNu/A200S Uses 100v 1.5mohm mosfets but current sense ICs are limited to 75v absolute max. So 16s or below. Are you the developer of this VESC? This would be for sure a great controller for such sort of motors or generally high power RC...
by madin88
Aug 11 2018 8:06am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 275
Views: 21202

Re: Nucular electronics - complete kit for ev!

Support for torque PAS sounds great and also the thing with the gearsensor (which i think is difficult to deal with to make the torque interruption smooth).
by madin88
Aug 11 2018 6:21am
Forum: Motor Technology
Topic: Minimising rotor losses
Replies: 94
Views: 2463

Re: Minimising rotor losses

If the rotor backiron towards stator would be very coarsely threaded/slotted, let's say with 5mm pitch and a depth of 3mm.. That'd be interesting to try. Who has access to a large lathe on ES? 8) And who's doing a motor design currently? Crossbreak or Miles maybe? I would do it with the electrical ...
by madin88
Aug 11 2018 5:09am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2735
Views: 159277

Re: Sur-Ron - New Mid drive Bike

One could go to a 52T sprocket on the rear and a 13T (4:1 ratio)sprocket up front and have the exact gear ratio of a 48T to 12T witch is also 4:1 ratio. I don't know if it would be any more quieter though, but performance would be real close to identical. Thats how it is. The larger the small drive...
by madin88
Aug 10 2018 1:02pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 635
Views: 141548

Re: Electric Surf Board

If motor current is larger as the battery current by such a big factor (10A battery and 100A phase around 50s) than it's normally a sign of overload.
Is the size of the propeller correct and what about the motor kV? If you would use a motor with way too high kV it could look similar..
by madin88
Aug 10 2018 12:47pm
Forum: Items for Sale - New
Topic: Professional ESC base on VESC introduction
Replies: 61
Views: 2658

Re: Professional ESC base on VESC introduction

What is the max ERPM a VESC 4.12 or 6.6 can do in FOC mode?
by madin88
Aug 08 2018 2:58pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

This is one of the coolest drive systems i've seen on here. i gotta ask though.. where did you get the drive sprocket holder? or was it just custom? It looks like it was designed to hook up to a bike chainring. Thanks! yes the sprocket holder is normally used to hold a cart chainring. I bought it f...
by madin88
Aug 08 2018 2:53pm
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 324
Views: 21460

Re: PowerVelocity controller review

fechter wrote:
Aug 06 2018 9:34pm
I can hit 60A but as soon as I pick up some speed it drops to 50A. At that point the motor just isn't taking more.
really also on a 12F? Because the programming app does not allow more than 45A from what i know.
by madin88
Aug 08 2018 2:44pm
Forum: Items for Sale - New
Topic: Professional ESC base on VESC introduction
Replies: 61
Views: 2658

Re: Professional ESC base on VESC introduction

The existing firmware allows for: forward forward reverse center forward with button reverse forward reverse on adc2 and button brake forward brake center no reverse (tesla mode) forward no reverse brake button forward no reverse brake on adc2 Ok so it can do regen (brake) and go into revers. Do yo...
by madin88
Aug 06 2018 4:02pm
Forum: Items for Sale - New
Topic: Professional ESC base on VESC introduction
Replies: 61
Views: 2658

Re: Professional ESC base on VESC introduction

fechter wrote:
Aug 06 2018 12:30pm
Another nice feature would be to have a 1-4v analog throttle input. While skateboards would use a PWM RC receiver input, an ebike or scooter generally uses an analog hall effect throttle.
AFAIK it does have such input, but maybe Flipsky can confirm it.
by madin88
Aug 06 2018 3:59pm
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 324
Views: 21460

Re: PowerVelocity controller review

Wow, you're really pushing that thing hard. I have the 12F version with 4110s and can hit peaks of 3kW but closer to 2kW for long stretches. Mine gets pretty warm but I have it mounted to the bike frame with heavy aluminum that acts like a heat sink. It is running at 40A and 20s battery, but the ph...
by madin88
Aug 05 2018 6:44am
Forum: Items for Sale - New
Topic: *SOLD* FS: USD 800: Adaptto Midi-E (X2) + Display + BMS + Circuit Breaker
Replies: 3
Views: 405

Re: FS: New Adaptto Midi-E (2 Units) + BMS + Circuit Breaker + Display

Hi,
if nobody want's to take the complete 2WD unit, would you mind to sell me one single controller?
I really would just need one controller without display, bms or anything else.
by madin88
Aug 05 2018 5:58am
Forum: E-Bike Reviews & Testing
Topic: PowerVelocity controller review
Replies: 324
Views: 21460

Re: PowerVelocity controller review

I had to replace all the AOT290 FET's on two 12F controllers because the stock ones, which seemed to be non-genuine, broke two times (they just had a short circuit), even at very low battery voltage (13s) and low amp settings. Following thing probably has nothing todo with the initial problem, but w...
by madin88
Aug 05 2018 5:20am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

Some pics: https://imagizer.imageshack.com/v2/xq90/924/bwp27C.jpg https://imagizer.imageshack.com/v2/xq90/924/HYqlNQ.jpg next to a SuperSoco E-moped :mrgreen: https://imagizer.imageshack.com/v2/xq90/923/LfjKK4.jpg https://imagizer.imageshack.com/v2/xq90/924/HgsHJF.jpg The belt stays well at it's pla...
by madin88
Aug 05 2018 4:53am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12351

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

So far i have ridden more than 1000km now. Aside from the blown Max-E and other problems with the controller (more about that later) i had no issues with the drive system. The belt shows a little wear in the form of small cracks (i counted two or three on the topside on a closer inspection), but i d...