Dual-Loop Control of Asynchronous Motors

Dual-loop control of asynchronous motors in Simulink represents an efficient motor control methodology widely applied in electric drive systems, primarily designed for regulating motor speed and position. This control architecture features two nested feedback loops: an outer loop and an inner loop. The outer loop governs motor position by regulating rotational speed, while the inner loop controls motor speed through current regulation. This hierarchical approach enhances motor performance while ensuring operational stability and reliability. In practical implementation, Simulink provides a comprehensive platform for developing dual-loop control systems for asynchronous motors. The software offers specialized function blocks including: - Speed Controller (typically PI/PID): Computes torque reference based on speed error - Current Controllers (for d-q axes): Regulate stator currents using Park/Clarke transformations - PWM Generation Module: Converts control signals to switching patterns for inverters Key implementation considerations include: 1. Coordinate transformation algorithms (abc to dq reference frame) 2. Discrete PI controller tuning with anti-windup protection 3. Space Vector PWM (SVPWM) implementation for voltage source inverters 4. Mechanical observer design for sensorless speed estimation The modular Simulink environment enables rapid prototyping through drag-and-drop components like Transfer Function blocks, Lookup Tables, and State-Space models, significantly improving control system efficiency and precision through graphical simulation and automatic code generation capabilities.