Mechanism modeling and analysis of surplus torque in aeroload simulator

Aeroload simulator (ALS) is an important hardware-in-loop simulation equipment. In ALS system, surplus torque is the main cause of loading error. And the elimination of surplus torque has become research hotspot for a while, but study about cause of surplus torque has not made much progress. In this paper, a theory about the origin and mechanism modeling method of surplus torque is raised and the model is simulated based on permanent magnet synchronous motor (PMSM) system. Validity of newly launched model is proved by comparison with initial model and the source of error is analyzed afterwards. Moreover, to determine control strategy for eliminating loading error, influential factors of surplus torque are analyzed based on the mechanism model.