Bldc
About the Bldc PCB
Bldc is an open source STM32 PCB design by kobertkirk, published on GitHub. It is a 4-layer board measuring 190 × 120 mm, with 163 components from 58 distinct parts.
Its main chip is the STM32G431CBT6, from the STM32 family. Other key parts include the LM5164DDA, AP2112K-3.3, LM5109BMA and INA240A2D. By type, the board carries 64 resistors, 59 capacitors, 11 diodes, 10 ICs, 8 transistors and 7 connectors.
It belongs with the robotics & motion and sensors designs in this gallery.
From the project
A KiCad hardware design plus STM32 firmware for a hall-sensored e-bike or scooter hub motor:
A KiCad hardware design plus STM32 firmware for a hall-sensored e-bike or scooter hub motor:
48 V nominal (13S Li-ion, 54.6 V full). All power parts are rated 100 V and the TVS clamps at 60 V standoff. 35 A battery current limit and 60 A phase current limit. Both are set in firmware and can be changed over UART. Field-oriented control (FOC) using the hall sensors, with angle interpolation, for quiet and smooth torque from standstill. Throttle input (standard 0.8–4.2 V hall throttle). Momentary power button. Press to switch on, hold for 2 s to switch off. Standby current is a few µA. FWD/REV…
Main components on the Bldc
Bldc bill of materials (BOM)
163 components, 58 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | LM5164DDA | HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm_ThermalVias | U1, U2 |
| 1 | AP2112K-3.3 | SOT-23-5 | U3 |
| 3 | LM5109BMA | SOIC-8_3.9x4.9mm_P1.27mm | U4, U6, U8 |
| 3 | INA240A2D | SOIC-8_3.9x4.9mm_P1.27mm | U5, U7, U9 |
| 1 | STM32G431CBT6 | LQFP-48_7x7mm_P0.5mm | U10 |
| 1 | MMBTA92 | SOT-23 | Q1 |
| 1 | MMBTA42 | SOT-23 | Q2 |
| 6 | IPT015N10N5 | Infineon_PG-HSOF-8-1 | Q3, Q4, Q5, Q6, Q7, Q8 |
| 1 | SWD | PinHeader_1x05_P2.54mm_Vertical | J6 |
| 1 | HALL | JST_PH_B6B-PH-K_1x06_P2.00mm_Vertical | J7 |
| 1 | THROTTLE | JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J8 |
| 1 | FWD/REV | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J9 |
| 1 | BRAKE | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J10 |
| 1 | POWER_BTN | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J11 |
| 1 | UART | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J12 |
| 1 | NCP18XH103F03RB 10k B3435 | R_0603_1608Metric | TH1 |
| 1 | SMCJ60CA | D_SMC | D1 |
| 1 | 1N4148W | D_SOD-123 | D2 |
| 1 | BAT46W | D_SOD-123 | D3 |
| 2 | GREEN | LED_0603_1608Metric | D4, D8 |
Show 38 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | ES1D | D_SMA | D5, D6, D7 |
| 1 | RED | LED_0603_1608Metric | D9 |
| 2 | ESDA6V1-5SC6 | SOT-23-6 | D10, D11 |
| 1 | 600R@100MHz | L_0603_1608Metric | FB1 |
| 1 | SRR1260-680M 68u | L_Bourns_SRR1260 | L1 |
| 1 | SRR1260-330M 33u | L_Bourns_SRR1260 | L2 |
| 2 | 10N 10n | C_0603_1608Metric | C1, C31 |
| 7 | 1n | C_0603_1608Metric | C2, C35, C39, C43, C53, C54, C55 |
| 8 | 2.2U/100V 2.2u/100V | C_1210_3225Metric | C3, C10, C25, C26, C27, C28, C29, C30 |
| 2 | 100N/100V 100n/100V | C_0805_2012Metric | C4, C11 |
| 2 | 2.2N 2.2n | C_0603_1608Metric | C5, C12 |
| 2 | 3.3N 3.3n | C_0603_1608Metric | C6, C13 |
| 16 | 100N 100n | C_0603_1608Metric | C7, C14, C34, C38, C42, C44, C45, C46 +8 |
| 2 | 22U/25V 22u/25V | C_1210_3225Metric | C8, C9 |
| 2 | 22U/10V 22u/10V | C_1210_3225Metric | C15, C16 |
| 2 | 1u | C_0603_1608Metric | C17, C50 |
| 2 | 4.7U 4.7u | C_0805_2012Metric | C18, C49 |
| 6 | Panasonic EEU-FS2A221 (or eq. low-ESR) 220u/100V | CP_Radial_D12.5mm_P5.00mm | C19, C20, C21, C22, C23, C24 |
| 3 | 1U/25V 1u/25V | C_0805_2012Metric | C32, C36, C40 |
| 3 | 2.2U/25V 2.2u/25V | C_0805_2012Metric | C33, C37, C41 |
| 5 | 100K 100k | R_0603_1608Metric | R1, R4, R6, R9, R18 |
| 1 | 47K 47k | R_0603_1608Metric | R2 |
| 22 | 10K 10k | R_0603_1608Metric | R3, R5, R11, R15, R20, R21, R23, R25 +14 |
| 1 | 330K 330k | R_0603_1608Metric | R7 |
| 1 | 27K 27k | R_0603_1608Metric | R8 |
| 1 | 90.9K 90.9k | R_0603_1608Metric | R10 |
| 1 | 365K 365k | R_0603_1608Metric | R12 |
| 1 | 41.2K 41.2k | R_0603_1608Metric | R13 |
| 1 | 31.6K 31.6k | R_0603_1608Metric | R14 |
| 1 | 178K 178k | R_0603_1608Metric | R16 |
| 4 | 2.2K 2.2k | R_0603_1608Metric | R17, R48, R50, R52 |
| 1 | 5.6K 5.6k | R_0603_1608Metric | R19 |
| 6 | 10R | R_0603_1608Metric | R22, R24, R30, R32, R38, R40 |
| 3 | Bourns CRA2512-FZ-R500ELF (3 W) 0.5m | R_2512_6332Metric | R26, R34, R42 |
| 5 | 100R | R_0603_1608Metric | R27, R35, R43, R62, R63 |
| 8 | 1k | R_0603_1608Metric | R46, R47, R49, R51, R53, R55, R59, R61 |
| 1 | 12K 12k | R_0603_1608Metric | R56 |
| 1 | 22K 22k | R_0603_1608Metric | R57 |
Bldc design files
The KiCad project lives in the kobertkirk/bldc repository on GitHub; these links point at the commit this page was built from.
Bldc: common questions
What microcontroller does the Bldc use?
The Bldc is built around the STM32G431CBT6, from the STM32 family.
How big is the Bldc PCB?
The Bldc measures 190 × 120 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Bldc?
163 components, from 58 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Bldc design files?
From the kobertkirk/bldc repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Bldc design in my own project?
The repository has no license, so all rights stay with kobertkirk. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Bldc without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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