Search found 44 matches

by drdrs
Jan 06 2022 10:11am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 421
Views: 31670

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

alldatasheet says that 18JD marking corresponds to the TI INA181 family of current sense amplifiers. According to the datasheet, the chip comes in 20, 50, 100, and 200 V/V gains. I couldn't determine if the marking tells you which chip in the family it is.
by drdrs
Jan 05 2022 11:51pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 421
Views: 31670

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

I think the current amp gain is determined by the part number on the amp. The FSESC 7550 uses the INA240A1 and the data sheet says 20 V/V.

I didn't see a part on the photos on esk8 news with a part number that matched a current amp.
by drdrs
Jan 05 2022 7:22pm
Forum: Motor Technology
Topic: Maximum motor temperature
Replies: 6
Views: 321

Re: Maximum motor temperature

Has anybody written a reference with the multiple relevant temperature limits for motors with sources? Could be useful for responsible limit-pushing... - Magnet coercivity vs temperature (80C?) - Magnet curie point (300C?) - Hall sensor failure temperature (120C?) - Motor wire enamel (???) - Any oth...
by drdrs
Dec 24 2021 1:03am
Forum: EBike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 5176
Views: 703102

Re: LightningRods mid drive kit

LightningRods wrote:
Dec 23 2021 11:27pm
drdrs wrote:
Dec 23 2021 9:41pm
Is it possible to run the thermistor through the same sheath as the hall wires?
Sure. They won’t interfere with each other. It’s just added shrink wrap
Could that be done at the factory? Motors with integrated hall and thermistor cables are very convenient.
by drdrs
Dec 23 2021 9:41pm
Forum: EBike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 5176
Views: 703102

Re: LightningRods mid drive kit

LightningRods wrote:
Dec 23 2021 11:10am
The hall wires are now in a separate sheath from the phase wires.
Is it possible to run the thermistor through the same sheath as the hall wires?
by drdrs
Dec 19 2021 2:42am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 10748

Re: APL's Pressure Contact Battery box

Thank you very much for spotting the PTCs and giving me "SMT contact pad" to google. You're right, it is straightforward to replicate this design on a PCB. The announcement from Trampa on esk8 news (linked below) claims: "The connection is made via a special, 25A fused contact element...
by drdrs
Nov 23 2021 12:01am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 10748

Re: APL's Pressure Contact Battery box

Exactly right. They were using a proprietary part with a PTC placed inside the disks on the PCB. That part is probably unobtainium. I'm wondering if anyone knows of an alternative disk-shaped part to create a contact to the PCB or other ideas to use a PCB as the connection. Lack of a PTC isn't a dea...
by drdrs
Nov 22 2021 3:59pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 10748

Re: APL's Pressure Contact Battery box

Trampa boards used a PCB with a small disk with a resettable fuse inside for current carrying. They didn't give any details about that proprietary part.

Does anyone know of an available part that could be surface mounted on a PCB to provide electrical contact to a perpendicular cell?
by drdrs
Nov 02 2021 11:19pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 10748

Re: APL's Pressure Contact Battery box

The first Vruzend pack I built had some poor contacts before I added compression plates. To diagnose the bad p-groups, I used the smart BMS report of each p-group voltage during charging. P-groups with a bad contact would charge more quickly and the slope of the voltage was higher. This was detectab...
by drdrs
Oct 31 2021 6:09pm
Forum: Battery Technology
Topic: New Easy Lithium Weldless Box crowdfunding project
Replies: 18
Views: 1054

Re: New Easy Lithium Weldless Box crowdfunding project

Trampa claims cell level fusing using an integrated PTC in the PCB battery contact.

https://trampaboards.com/18650-pcb-pack ... 28977.html
by drdrs
Oct 04 2021 7:31pm
Forum: Motor Technology
Topic: A Small 6 fet Vesc 6 Design
Replies: 111
Views: 7078

Re: A Small 6 fet Vesc 6 Design

I have managed to get all the parts needed apart from the canbus chip which isn't essential at the moment and the X50328MSB2GI clock crystal. Are there any substitutes I can use for the crystal or even omit it? As far as I know, the crystal is only needed for USB to work. I have a VESC without a cr...
by drdrs
Jun 19 2021 12:00am
Forum: Motor Technology
Topic: Vesc Hard Limiting Top Speed
Replies: 3
Views: 475

Re: Vesc Hard Limiting Top Speed

I have the same issue and don't know a workaround.

If you are comfortable running beta firmware, the 5.03 beta has field weakening allowing you to go over base speed.

https://vesc-project.com/node/2859
by drdrs
May 10 2021 9:58am
Forum: Items for Sale - Used
Topic: [SOLD] Energus Tiny BMS s516 v2.1 Unit and Spare
Replies: 1
Views: 376

[SOLD] Energus Tiny BMS s516 v2.1 Unit and Spare

One fully functioning Tiny BMS s516 v2.1 unit and one spare needing repair. I've run these units at 150 battery amps peak for several months and they work very well. Selling all parts with shipping to continental US for 120 USD. Link to manufacturer description: https://www.energusps.com/shop/produc...
by drdrs
Feb 05 2021 3:47pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 114
Views: 12567

Re: building the BESC - 100V, 400A motor controller

beautiful. is vesc tool reading the bms values and creating those text outputs?
by drdrs
Feb 04 2021 10:53pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 114
Views: 12567

Re: building the BESC - 100V, 400A motor controller

did you use COMM_GET_VALUES or COMM_GET_VALUES_SELECTIVE as the command in the CANbus request frame?
by drdrs
Feb 04 2021 10:47pm
Forum: Vendor Relations Corner
Topic: Accelerated Systems ASI BAC 4000 & BAC 8000 FOC BT Controllers
Replies: 153
Views: 61865

Re: Accelerated Systems ASI BAC 4000 & BAC 8000 FOC BT Controllers

This thread might be a good candidate:

"Programming ASI Bac 8000"
viewtopic.php?f=2&t=102828
by drdrs
Jan 19 2021 11:45pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 114
Views: 12567

Re: building the BESC - 100V, 400A motor controller

The RedCube parts mount directly on the PCB. The diebiems BMS board uses them and you can see them in the photos here:

https://hackaday.io/project/28340-diebi ... ent-system

They connectors press fit into a matching footprint on the circuit board.
by drdrs
Jan 18 2021 8:36pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 114
Views: 12567

Re: building the BESC - 100V, 400A motor controller

I misspoke and meant a ring terminal connector. The current ASI BAC 2000, 4000, and 8000 have the connector I meant. https://www.acceleratedsystems.com/products/electric-motor-controllers/bac2000 I don't know what part ASI uses but the Wurth RedCube Press-fit terminals are usually available from sup...
by drdrs
Jan 17 2021 3:17pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 114
Views: 12567

Re: building the BESC - 100V, 400A motor controller

That serial display is well done. I also used adafruit parts to do a display and recently built one using the circuit python language. Adafruit has created a microcontroller board (feather) that uses the SAMD with a CANbus ports and a transceiver. When that gets out of backorder, I'll start developi...
by drdrs
Jan 11 2021 11:50pm
Forum: Battery Technology
Topic: jonescg's cylindrical cell build thread
Replies: 65
Views: 4210

Re: jonescg's cylindrical cell build thread

Looks very nice.

Are the holder plates polycarbonate? How are they machined?
by drdrs
Jan 03 2021 4:31pm
Forum: EBike Build Threads
Topic: Black Sabbath: Teleport Prime, Weldless Battery
Replies: 3
Views: 679

Re: Black Sabbath: Teleport Prime, Weldless Battery

The fork is the garden variety DNM USD-8 with the badging removed. I rode a Vruzend for a year without any noticeable contact degradation. That battery was the 2.0 contacts and didn't have the barrel bolts so I did external compression plates. I had contact issues before I got sufficient compression...
by drdrs
Jan 03 2021 3:25pm
Forum: EBike Build Threads
Topic: Black Sabbath: Teleport Prime, Weldless Battery
Replies: 3
Views: 679

Black Sabbath: Teleport Prime, Weldless Battery

This bike (black and built while on sabbatical) is a typical hub motor with enduro frame build. The unique aspects are: - Teleport Prime 90 frame - Custom weldless battery design (14s5p VTC6, 80 mOhm IR) - ENNOID SS BMS - CircuitPython-based dashboard display bike.jpg Most of the parts were taken fr...
by drdrs
Dec 19 2020 12:25pm
Forum: EBike Technical
Topic: Ampy: Open source python display/interface project for ASI controllers
Replies: 24
Views: 3296

Re: Ampy: Open source python display/interface project for ASI controllers

This is an excellent project filling an important niche. I've been developing two python interfaces for ASI controllers that the community may also find useful. The first is a simple desktop configuration app for tuning parameters. https://github.com/dsoto/BAC-Configurinator screenshot.png The secon...
by drdrs
Nov 14 2020 10:50am
Forum: Battery Technology
Topic: Open source BMS for 48V to 400V lithium-ion battery pack
Replies: 384
Views: 77045

Re: Open source BMS for 48V to 400V lithium-ion battery pack

This is great progress. - 2mm pitch for the 2x13 would be great if you can find a part. Below 2mm gets very difficult to reliably crimp for mortals. - Having a pad footprint that allows direct solder or Wurth terminal is good for flexibility and cost reduction. - Matching the old footprint and mount...
by drdrs
May 15 2020 11:43pm
Forum: Battery Technology
Topic: Open source BMS for 48V to 400V lithium-ion battery pack
Replies: 384
Views: 77045

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

Looks very good to me. Having all the connectors on the top side is more convenient for installations. Also, the larger pitch connectors makes it easier for hobbyists to crimp their own wiring harnesses.