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  1. drdrs

    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.
  2. drdrs

    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.
  3. drdrs

    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 (???) -...
  4. drdrs

    LightningRods mid drive kit

    Could that be done at the factory? Motors with integrated hall and thermistor cables are very convenient.
  5. drdrs

    LightningRods mid drive kit

    Is it possible to run the thermistor through the same sheath as the hall wires?
  6. drdrs

    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". I...
  7. drdrs

    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...
  8. drdrs

    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?
  9. drdrs

    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...
  10. drdrs

    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-with-integrated-bms--fits-mkiv-classic-monster-box--84-x-18650-cells-to-give-21000-mah-21a-of-range---p-28977.html
  11. drdrs

    A Small 6 fet Vesc 6 Design

    I have a VESC without a crystal that repeatably loses CAN bus communication at higher temperatures with a measurable bit rate difference, strongly suggesting clock drift due to temperature.
  12. drdrs

    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
  13. drdrs

    [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...
  14. drdrs

    building the BESC - 100V, 400A motor controller [NOT RECOMMENDED]

    beautiful. is vesc tool reading the bms values and creating those text outputs?
  15. drdrs

    building the BESC - 100V, 400A motor controller [NOT RECOMMENDED]

    did you use COMM_GET_VALUES or COMM_GET_VALUES_SELECTIVE as the command in the CANbus request frame?
  16. drdrs

    Accelerated Systems ASI BAC 4000 & BAC 8000 FOC BT Controllers

    This thread might be a good candidate: "Programming ASI Bac 8000" https://endless-sphere.com/forums/viewtopic.php?f=2&t=102828
  17. drdrs

    building the BESC - 100V, 400A motor controller [NOT RECOMMENDED]

    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-diebiems-a-3-to-12s-battery-management-system They connectors press fit into a matching footprint on the circuit board.
  18. drdrs

    building the BESC - 100V, 400A motor controller [NOT RECOMMENDED]

    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...
  19. drdrs

    building the BESC - 100V, 400A motor controller [NOT RECOMMENDED]

    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...
  20. drdrs

    jonescg's cylindrical cell build thread

    Looks very nice. Are the holder plates polycarbonate? How are they machined?
  21. drdrs

    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...
  22. drdrs

    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 Most of the parts were taken...
  23. drdrs

    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 The second is...
  24. drdrs

    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...
  25. drdrs

    Open source 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.
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