Brushless motor current loop control method and device

The invention relates to a brushless motor current loop control method and device. The method comprises the following steps: determining real-time intermediate current according to acquired two-phase real-time current; determining a feedback current based on the real-time intermediate current and a pre-established function relationship between the average current and the intermediate current; determining a control voltage based on the feedback current and the motor parameters, so that a current loop of the brushless motor operates according to the control voltage; a function relation determination mode: controlling the brushless motor to work according to a given preset voltage, setting a current sampling moment at an underflow interruption moment of a triangular wave counter, obtaining sampling signals corresponding to current two current sampling channels at each sampling moment, and determining an average current and an intermediate current at the sampling moment; and determining a function relationship be