A FREQUENCY APPROACH FOR CURRENT LOOP MODELING WITH A PWM CONVERTER

A new method based on a frequency approach is used to model a de perma nent magnet actuator driven by a pulsewidth modulated amplifier as a t ransfer function, This paper investigates two carriers used in industr ial applications with analog or digital control, The accurate model pr esented takes into account the supply amplifier with the motor dynamic s and includes the input control voltage sampling effect, Advantages a nd Limitations of both carriers and control signals are discussed, and information about harmonic angles, magnitudes, and distortion are pro vided. The validation of the pulsewidth modulated model is carried out through simulations and experiments of both open and closed current l oop systems with the effect of current ripple.