Design Automation


Electronic speed controller demo board

23 October 2019 Design Automation

The B-G431B-ESC1 Discovery kit is based on STMicroelectronics’ STM32G431CB microcontroller, the L6387 driver and STL180N6F7 power MOSFETs. It is composed of a main power board, and a daughterboard with embedded ST-LINK/V2-1.

This electronic speed controller (ESC) is designed to drive a single three-phase brushless motor (brushless DC or permanent magnet synchronous motor), performing both sensorless FOC algorithm and 6-step control with a speed regulation and active braking function algorithm.

The ST sensorless FOC algorithm ensures longer flight times and an optimal dynamic performance. This unit accepts a command signal from an external unit for driving and monitoring, for instance a flight control board or equivalent. For this purpose, several communication bus interfaces (UART, CAN, PWM channel) are present. A potentiometer and a user button are available for user application.

The daughterboard includes a 5 V battery eliminator circuit (BEC), and the main board embeds an over-current/over-voltage and thermal protection circuit. The form factor makes it suitable for small and very light radio-controlled vehicles (FPV race drone) and the motor current capability fits the power requirement of big vehicles, for instance a prosumer drone.


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