Current Hysteresis Control for Permanent Magnet Linear Motors

Current hysteresis control plays a vital role in permanent magnet linear motors, significantly enhancing their performance and operational stability. To achieve this control strategy, we developed a custom linear motor model using Simulink's block diagram environment. The model construction involves implementing key components such as the motor's electromagnetic equations, mechanical dynamics, and power converter modules through Simulink's foundational blocks and Stateflow components. Through this model, we gain deeper insights into the operational principles of linear motors and conduct comprehensive simulations for hysteresis current control optimization. The control algorithm implements a bang-bang controller that maintains the motor current within a predefined hysteresis band by switching the power converter states. This control method ensures stable motor performance across various operating conditions while meeting diverse application requirements. The implementation typically involves comparing measured currents with reference values using relational operators, with hysteresis bandwidth parameters adjustable through Simulink's mask parameters. The simulation includes analyzing transient responses, tracking performance, and harmonic content using Simulink's scope and spectrum analyzer tools. Therefore, current hysteresis control constitutes an essential component in linear motor system design, carrying significant importance for improving system efficiency and reliability. The Simulink-based approach facilitates rapid prototyping and parameter tuning through its graphical programming interface and real-time simulation capabilities.