Reaction Wheel BLDC Motor Control PCB

A compact, single-board controller for a brushless DC (BLDC) reaction wheel.

Board at a glance

MCU	STM32G431CBUx (Cortex-M4F, QFN-48)
Gate driver	DRV8311H three-phase BLDC driver
Communication	CAN (SN65HVD231) + USB 2.0 (USB-C)
Power input	USB-C 5 V and screw-terminal motor supply
Layers	2-layer copper (F.Cu / B.Cu)
Outline	~49 × 49 mm, four corner mounting holes (H1–H4)
Designed with	KiCad 10

Schematic

PCB

Key Components

Reference	Part	Function
U2	STM32G431CBUx	Cortex-M4 motor-control MCU (QFN-48)
U4	DRV8311H	Three-phase BLDC gate driver / motor driver
U3	AS5047D	Magnetic rotary position (angle) sensor
U5	SN65HVD231	CAN transceiver
U6	TPS562200	Step-down (buck) converter
U1	USBLC6-2SC6	USB ESD protection
D3	NUP2105L	CAN bus ESD protection
Y1	16 MHz crystal	MCU clock source
J4	USB-C receptacle	Power + USB 2.0 data
MT1	Phoenix screw terminal	Motor power input

Connectors & I/O

• J4 — USB-C (USB 2.0 + power)
• MT1 — 2-pin screw terminal (motor phases / power)
• J1, J2, J5 — 1x4 pin headers
• J3 — 1x3 pin header
• J6 — 1x6 pin header
• SW1 — SPST tactile button

Passives & Discretes

• Capacitors: 10n, 10p, 100n, 0.1u, 1u, 4.7u, 10u, 22u (0402 / 0603 SMD)
• Inductors: 2.2u (0402), 120R ferrite bead (FB1)
• Resistors: 5k1, 10k, 30.1k, 100k (0402 / 0603 SMD)
• Diodes: SS34 Schottky (D1, D2)

A full bill of materials can be regenerated from the schematic with:

kicad-cli sch export bom reaction-wheel-bldc-motor-control-pcb.kicad_sch -o bom.csv

Design Files

• reaction-wheel-bldc-motor-control-pcb.kicad_sch — schematic
• reaction-wheel-bldc-motor-control-pcb.kicad_pcb — PCB layout
• reaction-wheel-bldc-motor-control-pcb.kicad_pro — KiCad project

Designed with KiCad 10.