Abstract: This paper introduces the principle, hardware design, and control strategy of a three-loop control system for current, speed, and position based on a TMS320LF2407A DSP. Robust control technology and error separation methods are used to design the controller. Experimental results show that this method can achieve satisfactory control results. Keywords: Position control system; Servo; DSP; Robust control. A servo motor is an important component of an aircraft, and its performance directly affects the guidance accuracy of the aircraft. The servo system is a high-precision position servo system. The servo controller receives the control surface deflection signal from the guidance computer and uses its output commands to manipulate the deflection of the missile's control surfaces, thereby changing the missile's attitude or trajectory to control its flight path. With the rapid development of aerospace and the development of various advanced precision-guided weapons, the overall performance requirements for servo systems on missiles are becoming increasingly stringent. Brushless DC motors combine the advantages of AC motors (simple structure, reliable operation, and convenient maintenance) with the advantages of DC motors (high efficiency, good speed regulation, and high control accuracy), and have been widely used in engineering and technology. DSP (Digital Signal Processor) is a widely applicable digital signal processor for various motor controls. It integrates the peripheral circuits required for motor control, greatly improving system reliability. However, in practical applications, due to the hysteresis and saturation phenomena of rare-earth permanent magnet motor magnetic materials, and the nonlinear changes in the magnetic properties of permanent magnets with temperature, brushless DC motors (BLDCMs) exhibit characteristics such as nonlinearity, multivariability, strong coupling, and large parameter perturbations. Furthermore, the BLDCM drive device suffers from dead zones and saturation, the load contains nonlinear factors such as elasticity, backlash, and frictional resistance dead zones, and the system includes unmodeled dynamics, all of which contribute to inaccurate system models and parameter mismatches. For details, please click: Research on Brushless DC Motor Control Systems