Search found 22 matches

by KWS Seuren
Mar 10 2020 10:52am
Forum: Motor Technology
Topic: 60kW 400V EV Motor Controller
Replies: 6
Views: 955

Re: 60kW 400V EV Motor Controller

You could use an industrial frequency converter for this induction motor. Or take a look at sevcon. They have high voltage controllers too.
by KWS Seuren
Dec 04 2019 4:45am
Forum: Motor Technology
Topic: Motor with Electromagnets on Stator and Rotor?
Replies: 2
Views: 1042

Re: Motor with Electromagnets on Stator and Rotor?

An induction motor is also a motor with electromagnets on the stator and rotor, The current in de rotor is induced via the stator windings.
by KWS Seuren
Nov 04 2019 2:57am
Forum: Items for Sale - Used
Topic: KTM EXCE elecrtic enduro SOLD
Replies: 3
Views: 2304

Re: KTM EXCE elecrtic enduro

What kind of display are you using?
by KWS Seuren
Oct 25 2019 9:16am
Forum: Items for Sale - Used
Topic: part out! zero SOLD
Replies: 5
Views: 952

Re: part out! zero s zf13.0

Where are u located at?
by KWS Seuren
Oct 25 2019 7:52am
Forum: E-Scooter and Motorcycle General Discussion
Topic: SilentEnduro conversions
Replies: 48
Views: 8028

Re: SilentEnduro conversions

Fantastic first post! KTM: What cells are you using? How is the throttle response with that controller? Surron: How much does it weigh? What cells are you using? Steel link for the shock linkage? :thumb: :thumb: :thumb: :thumb: Thanks! in KTM we used NCM 55Ah, like this: https://www.lithiumstorage....
by KWS Seuren
Oct 25 2019 4:27am
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

FWIW, I don't care much for the motor selection, at least not for handling a 250A continuous input, 500A peak. Sure it can handle it, but the copper in the motor will get hot doing it despite the liquid cooling. The phase-to-phase resistance is .027ohms in a motor weighing 52lbs plus the weight and...
by KWS Seuren
Oct 21 2019 3:12pm
Forum: Items Wanted
Topic: Panasonic 36V
Replies: 3
Views: 657

Re: Panasonic 36V

Hello, We have a 36V battery here that you need and can send it to you, the shipping costs will be around 40euros. We can put new cells in or send the case including holders and electronics. If interested I'll send some pictures for you to look at if it's the right one. Kind regards, Stan Seuren KWS...
by KWS Seuren
Oct 21 2019 2:31pm
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

The ANR26650m1b cells especially with their 4C fast charging capability with almost no difference in cycle life, then when used under 1C charging. The 15min charging time almost makes me wanna make a second pack consisting of only A123 cells for super high power and ultra fast charging between race...
by KWS Seuren
Oct 21 2019 11:49am
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

The ANR26650m1b cells especially with their 4C fast charging capability with almost no difference in cycle life, then when used under 1C charging. The 15min charging time almost makes me wanna make a second pack consisting of only A123 cells for super high power and ultra fast charging between races...
by KWS Seuren
Oct 21 2019 9:16am
Forum: Battery Technology
Topic: Wire Bonding machines
Replies: 8
Views: 1268

Re: Wire Bonding machines

I have searched for them in the past but too expensive unless you have high demand for alot of the same batteries.
by KWS Seuren
Oct 21 2019 3:23am
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

You simply need to build more room into your design for bigger packs. No way it will be a practical build otherwise with that thirsty a motor. But the LiFePO4 parallel packs may be a solution because if you add a 4p pack of A123 you've got 200Amps continuous extra with a relative small pack. If I a...
by KWS Seuren
Oct 20 2019 4:08pm
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 318
Views: 55657

Re: Common pack design mistakes, how to avoid?

How about 8x 20s1 packs? Would 8x 20s1 each with its own BMS be a good idea for e motorbike with 72v motor? My thoughts are... 8 or more smaller packs vould be easy to distribute inside the odd shaped box. If one pack fails I will still have the required voltage. If one cell in the pack fails, it w...
by KWS Seuren
Oct 20 2019 4:01pm
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

I forgot about one of the packs I combined, which was new RC lipo + A123's, whose combination picked up another advantage, improved safety. It was obvious the few times the A123's approached full discharge, but there was still plenty of juice left in the lipos to avoid deep discharge of the lipos. ...
by KWS Seuren
Oct 20 2019 6:52am
Forum: Battery Technology
Topic: Ebike charging connector
Replies: 2
Views: 438

Re: Ebike charging connector

So... You have a 5000w ebike, and you stuck your KEYS into the charging port?...????????? Were you drunk at the time, suffered a recent severe head injury, or had a stroke? For what Possible reason would you do such a thing? Well, first, you are going to need to find somebody who is not an idiot. N...
by KWS Seuren
Oct 20 2019 6:12am
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

I've done exactly that with 23s LiFePo4 packs and old 20s packs, and it's worked just as expected. The 20s pack helped keep the higher voltages stiffer and then the A123's took over the heavy lifting. That was without BMS's other than my human BMS. I would choose a ratio and top of charge voltage t...
by KWS Seuren
Oct 18 2019 5:41pm
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

Shapes of discharging curves are too much different. Therefore you get too big voltage differences through the course of discharge (from – 2.1V to + 6.2 V in this example) : LiFePo v 35E pack voltage.jpg Moreover LiFePo are much bigger and heavier with lower energy density. Why anybody instead of b...
by KWS Seuren
Oct 18 2019 2:57pm
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

Re: LiFePO4 / Li ion Parallel pack

A picture is worth a thousand words, hopefully also in this case. A123 M1B versus 35E.jpg Your idea is not good, politely told. Have you read my example? I meant to put the 30S lifepo4 parallel with a 25S Li-ion So when the battery is fully charged the voltage is 103.5V. HVC Charged = 103.5V / 30 =...
by KWS Seuren
Oct 18 2019 12:36pm
Forum: Battery Technology
Topic: LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower
Replies: 32
Views: 2077

LiFePO4 / Li ion Parallel pack, A123 hybrid for HighPower

Hello, I was thinking of making a parallel pack with LiFePO4 ANR26650M1B cells and Li-ion for example 35E cells. For example: 30S LifePO4 = 3.45V max per cell = 103.5V Fully charged 25S Li-ion = 4.14V max per cell (Good for long live) *The Max voltage of the lifepo4 is according to the charge curve ...
by KWS Seuren
Oct 17 2019 11:53am
Forum: Items Wanted
Topic: Mobipus 72600 or 96400
Replies: 3
Views: 741

Re: Mobipus 72600 or 96400

Hello,

Ballarat ebikes has them in their shop.

https://ballaratebikes.com/collections/controllers
by KWS Seuren
Oct 17 2019 11:30am
Forum: Items Wanted
Topic: I need battery for my new 48v 1000w ebike
Replies: 2
Views: 533

Re: I need battery for my new 48v 1000w ebike

What kind of battery case do you want?

There are multiple options like a battery bag, or battery case that is mounted on the downtube.

Where are you from?

I'm located in The Netherlands.

I can make you a battery pack with new genuine samsung or panasonic cells.
by KWS Seuren
Oct 15 2019 1:30pm
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 105
Views: 8340

Re: Samsung 40T and other cells like it?

I'm still surprised by the super low IR it has out of the box (7 milliohm) but I still wander if I use it at half it's discharge rate for bursts just like I limit customers with the 25R which is my main cell that it will last just as long. Hi rg, What do you think about the 25R against other cells,...
by KWS Seuren
Oct 13 2019 4:18pm
Forum: Items Wanted
Topic: 50/100 kW PMSM Survey
Replies: 5
Views: 1263

Re: 50/100 kW PMSM Survey

Hello, If the motor costs in the range of 2000 to 4000 for that power there will be enough demand for it for sure. Currently i am looking for an electric motor for a conversion. Do you have more details about the motor? Have you got a prototype or something like that? We are a company based in the N...