Modeling of an electromechanical actuator in respect to voltage stability in automotive power nets

Due to efficiency reasons, more and more previously mechanically driven systems have been electrified in recent years. While this development reduces fuel consumption in conventional drive trains, it is essential in electric vehicles due to the omission of the combustion engine. The transient peak power of these systems has a negative influence on voltage stability in automotive power buses. For this reason, voltage stability has become an important criterion in the design process of a power net. Beside the electrical power steering, the electro hydraulic breaking systems is one of the critical systems regarding peak power consumption. In this paper, a dynamic model of an electromechanical actuator for an automotive breaking system is presented. The model is validated by comparison of simulation and measurement from a real car. Furthermore, a sensitivity analysis examines the influence of parameters on the occurring peak current during the startup process. It is shown, that temperature and correlating armature resistance have an significant influence on the peak starting current.