# BLDC sensorless over-zero control

## Overview

This project shows a sensorless control method for brushless motors
- Control by trapezoidal wave algorithm
- Reverse electric potential over zero method to detect commutation moment
- Speed control

## Configurations

- This program uses the **BLM57050-1000** brushless motor of "Leisai Intelligence", please refer to the [Leisai Intelligence](https://leisai.com/) website for the specific parameters of the motor.

- Board settings refer to the development board documentation [Motor Pin](lab_board_motor_ctrl_pin) related content

- Requires board to support phase current acquisition

- ```{note}
    The motor driver board J6 J7 J12 to be connected to UU UV UW.
  ```

## Running the demo

The motor accelerates at speeds from 5 to 40 revolutions per second when the project is running correctly, then decelerates from 40 to 5 revolutions per second and keeps cycling.

```{warning}

- After the motor is powered on, it will first perform the "alignment" action. If the motor is disturbed at this time, it will produce a jitter.

- Pay attention to the current size, when abnormalities occur, please cut off the power at any time

```