Loss-based investigation and hybrid compensation of parameter variation effects on control of permanent magnet synchronous motors

摘要

In this paper, effect of parameter variation on motor loss in different control methods including unity power factor,rnmaximum torque per ampere, and loss minimization control methods has been investigated. Also, amount of efficiencyrnimprovement is investigated in the case of using compensator. Afterwards, a hybrid compensation method is proposedrnfor improvement of response time. To improve the response time to reach optimum operating point, initial value of daxisrncurrent is determined via model‐based method. Then, based on perturb and observe method, d‐axis referencerncurrent is changed step by step. Next value of d‐axis reference current is determined via measuring direction of dclinkrnpower variation. Two parameter compensation methods, namely, proposed hybrid compensation method andrnconventional search‐based method are compared with each other for different parameter variations including statorrnresistance (Rs), permanent magnet flux (λf), and q‐axis inductance. Also, performance of these methods is compared withrneach other under step load variation. Experimental results verify faster response time of proposed method in comparisonrnwith a conventional search‐based method.