Control Design of an Induction Machine Based Integrated Starter Alternator for 42V PowerNet

This paper presents complete control design of an induction machine based integrated starter alternator (ISA) for future automotive 42V Power Net. This paper discuss systematic design of current controllers, DC voltage controller and the field weakening control, based on mathematical model, in order to achieve challenging requirements demanded by ISA applications. The maximum power field weakening is achieved by controlling the stator voltage (Sang-Hoon and Seung-Ki, 1997). The original method was modified to remove the dependency of stator frequency on stator voltage, and to reduce the oscillations due to load disturbances in generation mode of ISA. A complete induction machine based ISA system with proposed control design was modeled and simulated. The experimental verification was carried out using prototype induction machine (5.5kW/22V, Motoring at 1000 rev/min) based ISA system. The prototype system was tested for DC bus voltage regulation and for the power generation capability. The simulation and experimental results confirm the performances of proposed control designing