Search found 638 matches

by bearing
Jun 02 2019 3:13pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

I've been doing EVs of all voltages now for the over a decade of experience, and I would make my personal no-budget ultimate EV dragster or hypercar 20-21s (77-73Vdc pack nominal). It's somewhere between a cost savings and cost penalty depending on the application, but if you're targeting ultimate ...
by bearing
May 17 2019 7:29am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

Aluminium energy sounds cool because it is easy to recycle. I researched Alevo because the Innolith advertisement video is a bit suspicuous and oriented towards people who don't understand technology, the staff and labs don't appear in the innolith video, it's girls skipping in sunny green wheat fi...
by bearing
Apr 29 2019 5:25am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

They do have patents, and they have been focusing on developing an electrolyte which doesn't produce unwanted and irreversible side reactions. So there is nothing obvious saying that it is a bluff. Not sure if there is anything backing the claim of 1000Wh/kg. Alevo seems to have been using LiFePO4, ...
by bearing
Apr 08 2019 7:25am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

Philaphlous wrote:
Apr 04 2019 6:53am
Not sure this has been posted yet or not.

https://www.theverge.com/platform/amp/2 ... ithium-ion
They are making one of the highest claims to date. 1000Wh/kg and 50000 cycles at 100% DOD.
https://innolith.com/
by bearing
Jan 21 2019 11:36am
Forum: Battery Technology
Topic: Toyota and Panasonic form huge battery R&D & production partnership
Replies: 12
Views: 850

Re: Toyota and Panasonic form huge battery R&D & production partnership

I think this sounds like a high up corporate decision, and not something sparked from an innovation in a lab.

Lots of manpower and hours will definitely lead to refinement of known technology. But not necessarily lead to innovation.
by bearing
Dec 06 2018 7:50am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

Here is a paper about solid state batteries with claims high power: "The cell possesses high specific power that is superior to that of conventional cells with liquid electrolytes. Stable cycling with a high current density of 18 C (charging/discharging in just three minutes; where C is the C-rate) ...
by bearing
Dec 06 2018 7:36am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

I don't think that is correct. Solid state batteries are often claimed to solve the power issue of liquid electrolyte lithium ion batteries. Especially for charging, since the solid electrolyte batteries doesn't have the drawback of a graphite electrode and SEI-layer buildup. So they should have a m...
by bearing
Dec 05 2018 12:37pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

The trend seems to be that higher energy density = cheaper materials costs per cell = lower cost per kw/hr. The first solid state batteries should be pretty spendy. Later on, we might find that they're significantly cheaper than the current generation. Solid state batteries are not significantly di...
by bearing
Aug 28 2018 5:59am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1819
Views: 222180

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Hm... yes! I remember i have 3x 1200A sensors that are powered from +/-15V. I would have to convert that to 5V then and amplify, but it would be feasible :). Nice! It would mean i would have to add a large box on Ampera inverter side to get cables through sensors. Did I mention i like mechanical pr...
by bearing
Aug 28 2018 4:14am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 79
Views: 10066

Re: Sensorless at standstill, development updates and status

Amazing work!

So how does it work with power? Does it take a "break" from driving the motor now and then to run the algorithm, or does it work continuously while powering the motor? (Not that I think it matters much for the user. I am mostly just curious and amazed!)
by bearing
Aug 28 2018 3:24am
Forum: E-Bike General Discussion
Topic: SUPER SOCO ... no Sur-ron here =)
Replies: 48
Views: 7339

Re: SUPER SOCO ... no Sur-ron here =)

I found some pictures of the insides of the battery: http://www.supersoco.eu/wp-content/uploads/2017/01/Akku_Panzerung_Super_SOCO_TS1200R_Heinzl2-800x1237.jpg https://www.outdoordreams.eu/images/product_images/popup_images/Battery%20-%20tt01.jpg Since it's 60V, I have assumed from the start that the...
by bearing
Sep 05 2017 9:01am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

Company "Ionic Materials, Inc.": http://ionicmaterials.com/ (They say:) Ionic Materials is a technology company focused on developing materials for batteries. At the core of our value proposition is a new solid polymer that has all of the properties required to replace the liquid electrolytes used ...
by bearing
Jan 30 2017 9:39am
Forum: Motor Technology
Topic: Update files Lebowski controller IC, latest: v2.A1
Replies: 60
Views: 8031

Re: Update files Lebowski controller IC, latest: v2.92

Hey Lebowski, I haven't visited this site in a long time. I'm thinking about buying one of your chips. I remember you showed a video once where you had a GUI which showed a dot spinning in a circle at the same speed of the motor. Are you still using that? Would that be a good tool to use when settin...
by bearing
Oct 24 2015 12:24pm
Forum: E-Bike General Discussion
Topic: Yamaha PED2 and PES2 AND YPJ
Replies: 3
Views: 824

Re: Yamaha PED2 and PES2 AND YPJ

I think the Yamaha PES2 (the sport bike, first pic) looks great. I almost feels bad, how good it looks. And at 130kg, it's lightweight too... Great bike.

Did anyone find more numbers on it, like battery energy, and motor power?
by bearing
Mar 23 2015 6:54am
Forum: Motor Technology
Topic: Conclusive proof gearboxes are awesome.
Replies: 790
Views: 85563

Re: Conclusive proof gearboxes are awesome.

The skin depth roughly limits the width of the conductors. In SMPS transformers the flux swings from full positive to full negative with a frequency of 20kHz to 2MHz or so. The skin depth is half a millimeter down to less than a tenth, in that span. In motors the full flux swings with the electrical...
by bearing
Jan 21 2015 11:40pm
Forum: Motor Technology
Topic: Plettenberg Nova motors and MST controllers: 15, 30, 150kW
Replies: 93
Views: 26282

Re: Plettenberg Nova motors and MST controllers: 15, 30, 150

Send them an email and ask.

From the manual, it looks like throttle controls PWM duty, which would be speed control.
by bearing
Jan 18 2015 10:53pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1819
Views: 222180

Re: Lebowski's motor controller IC, schematic and setup manu

I'm not sure if the battery fuse will blow fast enough to save the controller though. I think that field weakening will have benefits even if the motors no load speed is never exceeded. Without field weakening the controller can't put full current all the way to no load speed, because of motor+batte...
by bearing
Jan 05 2015 8:48am
Forum: Motor Technology
Topic: Revolt Rv-120 Pro Is this motor for real?
Replies: 22
Views: 5423

Re: Revolt Rv-120 Pro Is this motor for real?

Maybe, depends on what you expect. Depends on the controller as well. Do you know any motor of this power which have lower no load losses? I know one motor, but not the same size. The Agni 95 is about twice the weight and twice the power, but has about the same no load losses as this one, according ...
by bearing
Jan 05 2015 8:37am
Forum: Motor Technology
Topic: Revolt Rv-120 Pro Is this motor for real?
Replies: 22
Views: 5423

Re: Revolt Rv-120 Pro Is this motor for real?

You might get longer range if you gear for a lower motor speed. But then you don't get the same power/acceleration. At 36V it's about 180W no load losses, v.s. 500W at 72V. At 96V it would be somewhere around 800W. There is a tradeoff between winding and no load losses when choosing gearing. Peak ef...
by bearing
Jan 05 2015 4:37am
Forum: Motor Technology
Topic: Revolt Rv-120 Pro Is this motor for real?
Replies: 22
Views: 5423

Re: Revolt 120 Pro Is this motor for real?

Can someone understand and explain these charts? To be honest I can't really tell what it means. But honestly it does not seem to surpass 10Kw ever. Or so it seems to me. http://www.revolt.org.il/wp-content/uploads/2014/09/RV-120-72V-1.jpg If you look to the right in the graph you see ~7A no load c...
by bearing
Dec 24 2014 5:51pm
Forum: E-Bike Technical
Topic: ERPM limits of controllers, an observation
Replies: 14
Views: 3563

Re: ERPM limits of controllers, an observation

The 6-step trapezoidal controller, which my original post was about, will commutate 6 times per electrical cycle. http://www.pmdcorp.com/images/2013/january_2013_deep_dive/F5_Commutation%20Schemes%20-%20final.jpg That's why I multiplied the motor frequency by 6 to get the commutation frequency. 1667...
by bearing
Dec 24 2014 5:48am
Forum: E-Bike Technical
Topic: ERPM limits of controllers, an observation
Replies: 14
Views: 3563

Re: ERPM limits of controllers, an observation

100.000 ERPM is a commutation frequency of 10kHz. Since the PWM frequency is 33kHz, it seems Kelly limits the ERPM to a about 3 PWM periods per commutation period. The units of ERPM is cycles-per-minute, whereas Herz is cycles-per-second. So: 100,000 ERPM / 60 = 1667Hz commutation frequency The mot...
by bearing
Nov 04 2014 1:25pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1646
Views: 231580

Re: Thread for new battery breakthrough PR releases

http://www.solidenergysystems.com/updates.html, they claim to have a verified volumetric energy density of 1337 Wh/L. If their assertion about 2X current lithium energy density is true then we should be talking about a gravimetric energy density of 600 watt-hours per kg. This does actually look rea...
by bearing
Sep 26 2014 5:20am
Forum: Electric Watercraft
Topic: electric diving scooter
Replies: 69
Views: 5325

Re: advice on doubling peformance

If you increase battery voltage, you probably need a current limiting controller. Or at least one that ramps up the speed slowly so that it doesn't instantly put a very high current into the motor when it switches on while the motor is not moving. I believe that is what killed the transmission, not ...
by bearing
Sep 08 2014 3:21pm
Forum: Electric Watercraft
Topic: My new Electric Outboard Motor ( hub motor ) Silent and Fast
Replies: 65
Views: 30226

Re: My new Electric Outboard Motor ( hub motor ) Silent and

You will probably have to have a custom propeller made if you want to match Torquedo's performance.