Search found 1298 matches

by circuit
Apr 18 2019 11:26pm
Forum: Motor Technology
Topic: Steel-geared hub motor?
Replies: 124
Views: 19780

Re: Steel-geared hub motor?

I used a TIG machine (which is a precision instrument in welding world) to place a bead around shaft.
by circuit
Apr 18 2019 2:06pm
Forum: Motor Technology
Topic: Steel-geared hub motor?
Replies: 124
Views: 19780

Re: Steel-geared hub motor?

I have welded my bafang. All fine.
by circuit
Apr 13 2019 6:01am
Forum: Motor Technology
Topic: STSPIN devboard
Replies: 0
Views: 49

STSPIN devboard

Did not find any references on the forums. Anyone tried ST's STSPIN3201 devboard? It has a cheap hardware, fully capable of sensorless startup and torque control for traction applications. I am now playing with their motor control workbench, and got the motor spinning, but just barely. It stops when...
by circuit
Nov 26 2018 5:35pm
Forum: Motor Technology
Topic: Turnigy Rotomax good pair with PowerVelocity controller?
Replies: 9
Views: 1086

Re: Turnigy Rotomax good pair with PowerVelocity controller?

Why dont you just source one of the purpose made 48v "Altermotors" that GM fitted to various vehicles over the past 10+ years. They are 10-15 kW depending on the model year, and are readily available cheaply in dismantler yards. https://endless-sphere.com/forums/viewtopic.php?t=31584 Much simpler a...
by circuit
Nov 24 2018 12:11pm
Forum: Motor Technology
Topic: Turnigy Rotomax good pair with PowerVelocity controller?
Replies: 9
Views: 1086

Re: Turnigy Rotomax good pair with PowerVelocity controller?

Rotomax 150cc is the best RC motor I have seen: perfectly balanced and has an induction of 17μH, which is perfect for ebike application. I had a predecessor Turnigy CA-120 (5μH), which was very difficult to drive, controllers went in smoke, etc: https://www.youtube.com/watch?v=Gl4X1dRAdQQ I am writi...
by circuit
Oct 29 2018 3:22am
Forum: Battery Technology
Topic: Analog fuel gauge for Emus BMS?
Replies: 37
Views: 4512

Re: Analog fuel gauge for Emus BMS?

Hi,

I am no longer with the company and there may be changes I am not aware of, however thermal gauges should work fine.
Please contact support@emusbms.com for more details.
by circuit
Jul 11 2018 6:58am
Forum: Items for Sale - New
Topic: 5-16S Smart Tiny BMS preorder - 30/150/750A rated
Replies: 165
Views: 26384

Re: 5-16S Smart Tiny BMS preorder - 30/150/750A rated

Yes, charging current is lower, as it is handled by single mosfet. To gain higher current, you will need external switch (relay or solid state relay). Internal current sensor can still be used for currents up to 150A. I have just discussed this non-start issue with our engineer and he confirmed ther...
by circuit
Jul 11 2018 6:33am
Forum: Items for Sale - New
Topic: 5-16S Smart Tiny BMS preorder - 30/150/750A rated
Replies: 165
Views: 26384

Re: 5-16S Smart Tiny BMS preorder - 30/150/750A rated

Regarding current handling, there are 3 options: 1. "30A" model with integrated shunt for currents up to 30A. 2. "150A" model with integrated hall sensor for currents up to 150A. 3. "150A" model with external current sensor. Once this sensor is connected, BMS will detect it and allow higher current ...
by circuit
Jul 11 2018 3:30am
Forum: Items for Sale - New
Topic: 5-16S Smart Tiny BMS preorder - 30/150/750A rated
Replies: 165
Views: 26384

Re: 5-16S Smart Tiny BMS preorder - 30/150/750A rated

It may abort charging in case charger voltage is slightly too high and cells go over their preset voltage. To fix, decrease your charger's voltage slightly to meet exact voltage per cell. Note that BMS can't change voltage of charger or battery output, it only switches either on or off. So if your c...
by circuit
Jun 29 2018 3:26pm
Forum: Items for Sale - New
Topic: 5-16S Smart Tiny BMS preorder - 30/150/750A rated
Replies: 165
Views: 26384

Re: 5-16S Smart Tiny BMS preorder - 30/150/750A rated

Hi Circuit, I sent you an email two days ago from your web site's contact page, regarding my problem with the app ebike analyzer that won't stay open. I am waiting for your reply so that I can place my order for a TinyBMS and accessories. Are you still selling them? Hi Altair, Your email was likely...
by circuit
May 09 2018 8:53am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 615
Views: 74476

Re: kWeld - "Next level" DIY battery spot welder

Just a quick feedback: ordered this welder for our CNC machine. All good so far!
We use ultracaps with CCCV charger as power source.

Thanks for your effort and bringing a good product to market.
by circuit
May 09 2018 8:40am
Forum: Battery Technology
Topic: BMS for 13S Battery capable of handling 300A discharge
Replies: 9
Views: 994

Re: BMS for 13S Battery capable of handling 300A discharge

Really sorry for advertising project on several threads, but since this has not been mentioned here, have a look at this TinyBMS: https://www.energusps.com/shop/product/tiny-bms-s516-150a-750a-36 Up to 750 amps if used with current sensor. You can connect external contactor of use integrated high si...
by circuit
May 09 2018 8:36am
Forum: Battery Technology
Topic: BMS
Replies: 3
Views: 287

Re: BMS

Description matches EMUS BMS. It is available from other suppliers, like Faktor in Germany. For 16s 150 I would suggest to check my project: https://www.energusps.com/shop/product/tiny-bms-s516-150a-750a-36 Fully configurable, upgradable firmware, logs, flexible power switch control, bluetooth and A...
by circuit
May 09 2018 8:31am
Forum: Battery Technology
Topic: Overcoming Zener Knee for BMS
Replies: 53
Views: 1846

Re: Overcoming Zener Knee for BMS

Try Energus TinyBMS, it supports very low cell voltages, as long as overall pack voltage is above 9V. Also compatible with ultracaps.
https://www.energusps.com/shop/product/ ... 0a-750a-36

Up to 750 amps with external sensor.
Up to 16s though.
by circuit
Apr 13 2018 5:20am
Forum: Items Wanted
Topic: Single pouch cell 4Ah
Replies: 0
Views: 287

Single pouch cell 4Ah

Image

Dimensions 40x140x6.5mm, 4.0 Ah.
Can be used and lightly degraded.

Or I can sell 19 cells like this..
by circuit
Apr 07 2018 2:03pm
Forum: Motor Technology
Topic: What I wish I understood before buying my hubmotor
Replies: 3
Views: 697

Re: What I wish I understood before buying my hubmotor

Faster winding requires higher phase current. It does not necessarily mean higher power, if battery current is limited to same levels.
by circuit
Mar 31 2018 3:06am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

48 volts won't get me 120 mph. 48 volts probably won't get me 35mph... I don't want to look rude, but you seem to have some huge gaps in fundamental knowledge. While 120mph may be difficult with, say, 12V, it is more than doable with 48V, if you use your brain. To americans more power somehow alway...
by circuit
Mar 29 2018 3:58am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

flippy, but still, wouldn't it be easier to you and cheaper to your customer, if you modified the motor instead of replacing everything?
It does need some motor knowledge to understand what should be done, but after that it's a couple hour job.
by circuit
Mar 29 2018 3:31am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

In addition, it is much easier to rewind or reconnect existing windings to make things fast. First and easiest option is to connect it from Y to ∆. This will give an increase of x1.73. But not all motors are compatible, testing needed. Second option is to cut some poles and reconnect from series to ...
by circuit
Mar 29 2018 3:18am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

there is very good reasons to go in higher voltages. first: much less amps. that means less peukert effect rubbish, thinner cables. less voltage loss and so on. I'm well familiar with Peukert's law. Usually has a meaningful effect above 100kHz. Let me know the actual energy loss in % if it was ever...
by circuit
Mar 29 2018 12:14am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

As mentioned before, you don't actually need mosfets in the BMS, you can use logic power cutoff to achieve the same result without bulky mosfets and heat. If done this way, there is no current limit. Please help me to understand this. What is your reasoning for going above 60V? Speed? You can have t...
by circuit
Mar 28 2018 1:43pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

Well said, Pajda. In addinion, I want to stress that you don't actually need to go above 48V in ebike applications, at least below 10-20kW or so. I myself had several DIY ebikes that could classified as "fast" (up to 80km/h) and all of them run on 48V. 16s LiFePO4 in 2009, and 12s Li-ion today. Why ...
by circuit
Mar 28 2018 10:44am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

I fully understand the need of BMS for >16s packs, we get this a lot. There are several topologies out there: * Centralized (TinyBMS) * Distributed (for example, EMUS BMS) * Mixed / Star topology. Which is basically central control unit + several centralized boards. Each of these have specific marke...
by circuit
Mar 27 2018 3:54pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

Thank you for valueable feedback. This is not a first time I hear about wire length, so I'll make sure we will be able to offer longer balancing wire kits soon (couple months?).

By the way, there were several firmware updates, check release notes. Contact support for update file.
by circuit
Mar 26 2018 2:47am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 977
Views: 66108

Re: bluetooth BMS?

flippy, you probably did not notice it's my company :) I am glad you like it. By the way, there is a hack to get up to 150A constant without overheating. You can simply bypass the mosfets and connect your motor controller right after onboard current sensor, and configure cutoff device from mosfet to...