Commutation method and device of brushless direct current motor and medium

The invention relates to a commutation method and device of a brushless direct current motor and a medium. The method comprises the following steps: acquiring a motor mechanical angular velocity of the brushless direct current motor, and a target phase voltage, a target phase current and a phase current amplitude of the brushless direct current motor in a two-phase static coordinate system after filtering processing; determining a commutation error angle variation based on the mechanical angular velocity of the motor, the target phase voltage, the target phase current and the phase current amplitude; and correcting the commutation of the brushless direct current motor based on the commutation error angle variation. According to the technical scheme provided by the invention, the total commutation error of the brushless direct current motor position sensor can be corrected in real time, and high-precision commutation of the brushless direct current motor is ensured. 本公开涉及一种无刷直流电机的换相方法、装置及介质。该方法包括：获取无刷直流电机的电机机械