Pranav Subramanian
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BLDC Motor Driver

A 48 V, 750 W BLDC motor driver for a client, built around the STSPIN32F0A with custom hardware.

Type
Freelance (client project)
Period
Nov 2025 – Feb 2026
Location
Mumbai, India
Power
48 V, 750 W
Controller
STSPIN32F0A
The ST STEVAL-SPIN3202 development board wired to a BLDC motor
First prototype: the ST STEVAL-SPIN3202 development board driving a BLDC motor.

Overview

A brushless DC motor driver built for a client who needed a 48 V, 750 W drive. I prototyped the control on the STSPIN development board first, then designed my own hardware to meet the client's requirements.

What I built

  • 6-step commutation firmware on the STSPIN32F0A.
  • 20 kHz PWM, above the audible range, for silent motor operation.
  • Hall-sensor position tracking for commutation and position feedback.
  • Variable acceleration profiles and controlled deceleration for smooth, repeatable motor control.
  • RS485 communication with Modbus protocol support.
  • Custom hardware designed for the 48 V, 750 W power stage.

Demo

Demo video of the motor driver in operation.

Test setup

A 3D-printed test rig with a motor coupled to a second motor through a blue shaft coupler
Test rig with 3D-printed mounts coupling the motors.
The development board and the BLDC motor on the bench
Development board and motor on the bench.
  • STSPIN32F0A
  • 6-step commutation
  • Hall sensors
  • RS485 / Modbus
  • Power electronics