Examenspresentation av Mikael Bengtsson

Examiner: Jonas Fredriksson

Abstract:
This thesis presents a method of emulating a mechanical load in the context of electric drive systems. It investigates the implementation of a closed-loop emulator, based on a feedforward-tracking principle, on an existing dynamometer system. Furthermore, it analyses the possibilities of using a torque sensor to enhance the emulation performance and accuracy. A proposed method of including measured torque is presented with an analysis of how this affects the entire system’s dynamics.

A linear model of the dynamometer system is obtained with physical modelling and system identification methods. This model serves as the basis for a compensator in the emulator and is also used for system simulations.

The results show that the proposed emulator can emulate linear loads with varying inertia and friction in simulations and the physical system. This uses a model-based torque estimation based on torque from the torque sensor and shaft velocity. The resulting emulated velocity exhibits some oscillations when emulating moderate to high inertia loads. The cause of this is believed to originate from delays in the system.

Welcome!

Mikael and Jonas