Abstract : Based on TMS320LF2812A, the rotor position is obtained by the sensorless method and the high-precision control is achieved by the fuzzy PID algorithm. A fully digital control system for brushless DC motor is established. Effective suppression measures are taken for commutation torque pulsation, so that the system has good control characteristics. Keywords : brushless DC motor; DSP; direct back EMF method; fuzzy PID; torque pulsation; design 1. Introduction Brushless DC motor has a series of advantages such as simple structure, reliable operation and convenient maintenance, and also has many advantages of traditional DC motor such as high operating efficiency, good speed regulation performance and no excitation loss, so it is increasingly widely used. Compared with traditional DC motor, brushless DC motor does not use brushes for commutation, so there is no relative mechanical friction, and it will not produce the disadvantages of noise, electric spark, radio interference and short life caused by mechanical commutation [1]. DSP chips specifically designed for motor control have significantly higher processing speeds than microcontrollers. They integrate analog-to-digital converters, digital I/O, and PWM pulse generators. In particular, the powerful event manager of a DSP can execute complex, high-precision control algorithms in real time, reducing the delay between signal sampling and control command output, and improving dynamic behavior in speed control. Among these, TI's TMS320LF2812A is the most representative high-performance processing chip. 2. System Hardware Design From the perspective of high performance and practicality, a brushless DC motor control system based on the TMS320F2812A is established, using a digital signal processor as the core and following modular and digital design principles. The design includes DSP peripheral circuits, drive circuits, and hardware circuits for position, speed, and current signal detection, as shown in Figure 1. [Full text download of DSP-based brushless DC motor controller design]