Dynamic modeling and stability analysis of an experimental test bench for electric-drive vehicle emulation

This paper describes dynamic modeling and stability analysis of one of the dynamometers in an electric drive vehicle test bench designed based on two electromechanical dynamometers. The studied dynamometer is comprised of two electric machines coupled mechanically by one shaft. One of the electric machines acts as the traction motor and injects power to the shaft; the other machine emulates the road condition and absorbs power. This machine acts as a constant power load to the traction motor and degrades system's stability margins.