The PCBasPRO_0002 is an 2*motor controller board in development based on a JLCPCB parts. Ready for VESC6 up to 100V/200A design with individual gate drivers for all three phases. It is powered by an STM32F405 CPU and BLE WT51822_S4AT Capable of running Field Oriented Control at high power/voltages.
- 100V/200A continuous rating (RAW recomendation 84V/16A )
- 22s Battery voltage rating (Safe for 6S to 21S LIP0/Lllon, Voltage spikes may not exceed 100V)
- 1.5mm clearance on 100V (IPC-2221B, table 6-1, 51-100V on B3).
- 3-phase FOC motor control
- 4-layer smd design with individual gate drivers for all three phases
- Onboard IMU STM32F405 ( USB-C, CAN and BLE ready with WT51822_S4AT)
- 6mm trace for a copper rail (allow a increase of current)
- 12V for gate drivers, 5V for CAN and IMU, and 3.3V for CPU and op-amped current-sense amplification
- Cheap components available for ordering at JLCPCB and LCSC
- 1 PCB is 100x50mm, 2 PCBs with easybreak (can be splitted later) is 100x100mm and can drive 2 Motors.
- Easy to find 100x100mm heatsink with cheap price
- Price target arround 5-10 euro extra comparing with nordstream3
- Smallest transient loops possible
- Extra ports connector (no unconnected pins on uC)
- Shunt resistor is 12W, arround 245A max;
- RAW PCB trace of 6mm, arround 16A max @delta 40ºC
- By apply solder past will decrease the resistance in 50% so can go for 32A
- By apply 5*3mm copper will add 190A
- Now if we consider the 3 parallel of the iqual resistors we will have 1/3 (something between 66%-50% not the 50% as before) so I expect more then 190A already!!! So go crazy!!!!
- We can use this area to solder a copper heatshink to make 2 in 1
- 2 Connectors XT-90 100A*2=200A
- Mosfet 100V 268A@100ºC dont forget the heatsink and the follow info:
- Evaluate ESP32...
- Impedance match to stack-up
- Re-calculate all power and current, from footprint and traces point of view
- update PCB with privious topics.
- Evaluate the CAN connection to have a dual motor control in 100x100mm board (really cheap at JLCPCB)
- Get some people interested in Buy/testing the dual motor control (no material at home for that)
- Start conversations with VESC tool or set firmware
- Create an aluminium case (Pending from the selled samples
TOP:
Bottom:
This PCB is a combination of some ideas/work of the follow projects:
- https://github.com/shamansystems/Cheap-FOCer-2
- https://github.com/nordstream3/FOC/blob/main/README.md
- https://forum.esk8.news/t/prototyping-high-power-vesc-6-4-variant/32036/66
- https://vesc-project.com/vesc_tool
If you find this project useful and would like to support bread-and-butter for very time consuming development and maintenance, you can donate to the creator via Paypal.